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  1. #1

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    Hey all.

    I've been intrigued by these amps for a while, and purchased a Sequal Ravine today used at a very good price (half off new).

    My question is this: are these only for jazz/archtops, or do solid body guitars sound good through them as well? Something like a Gibson GA-50 sounds wonderful with solid bodys, and since Sequals are somewhat based around the old Gibson Octal preamp circuit, I was thinking they would as well, but I never could find a clip of a solid body through one.

    What can I expect? Thank you.

  2.  

    The Jazz Guitar Chord Dictionary
     
  3. #2

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    Welcome to the Forum, and congrats on finding a used SeQuel!!

    Assuming you're playing jazz/blues with the solid body, I'm sure the amp will sound great! If you're playing high-gain metal, then maybe not ..

    Please post some pics and a review when it arrives!

    Marc

  4. #3
    Hey thanks. I play a little jazz, blues, and mostly rock. But lately I have been really getting into Julian Lage and Bill Frissel style jazz. Kind of a hybrid style. Do you think the amp can handle rock and that style of jazz? My guitars are a Gretsch Duo Jet, Danocaster telecaster fitted with a P90 neck/Humbucker bridge, and a Fender Jazzmaster (right now it has SD Antiquities in it, but I might put in Fralin Noiseless P90s for playing out live). I was going to use the amp to gig all these styles and guitars. Think it can do the job?

    I became infatuated with the Octal/GA-50 sound after seeing Frissel cover Sam Cooke's "A change is gonna come". The clips I heard on the Sequal site sounded a lot like it, though they were clearly through a hollowbody. Frissel uses a Telecaster with a TK Smith (they usually sound twangy, but on this recording they sound magical) through a GA-50 mic'd with a ribbon.
    Last edited by beeswax; 11-21-2018 at 02:06 PM.

  5. #4

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    I played a couple of SeQuel amps a few years ago. The earliest amp was dubbed the “one-knob wonder” because it only had a volume control. I think the objective was to provide a warm/neutral frequency response referenced to classic jazz recordings and vintage Gibson amps. Treble and bass controls are now on all products, but I think the intended use is to start with controls at noon, and only use them to tweak a bit. This is in contrast to Fender’s midrange scoop. With Fender amps you must turn the bass and treble near zero to get a flat frequency response. If you find yourself turning the bass and treble very low when you use Fender amps you’ll probably get along well with the SeQuel. If you find Fender reverbs too bright and “surfy” you’ll probably like the SeQuel’s reverb much better. They are also beautiful and solid. Nice catch!
    Last edited by KirkP; 11-19-2018 at 08:02 PM.

  6. #5
    Quote Originally Posted by KirkP View Post
    I played a couple of SeQuel amps a few years ago. The earliest amp was dubbed the “one-knob wonder” because it only had a volume control. I think the objective was to provide a warm/neutral frequency response referenced to classic jazz recordings and vintage Gibson amps. Treble and bass controls are now on all products, but I think the intended use is to start with controls at noon, and only use them to tweak a bit. This is in contrast to Fender’s midrange scoop. With Fender amps you must turn the bass and treble near zero to get a flat frequency response. If you find yourself turning the bass and treble very low when you use Fender amps you’ll probably get along well with the SeQuel. They are also beautiful and solid. Nice catch!
    Thanks! Right now I play through a '62 Fender Princeton brownface, and it only has one tone knob, so I definitely don't tweak knobs much at all. Usually I have it on 4, which is a bit on the darker side, and then from there I will adjust the pickups a bit with my tone controls as well.

    I would stick with this amp were it not for my newfound obsession with a few jazz players and the fact I want to gig, and to bring a '62 Princeton to shows is probably not a wise idea.

    I do use some pedals (delay, strymon flint, big muff, and wah) occasionally for dynamics/build ups, but mostly play clean. My understanding is the Sequal has a lot of clean headroom. That could be nice compared with the Princeton, which breaks up around 4, and with the P-90 it breaks up even sooner.

  7. #6

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    99.9% of the folks here have never heard a Sequel amp. Congrats, you scored. Where on earth did you find a used Sequel Ravine?
    "You've got to be in the sun to feel the sun. It's that way with music too." - Sidney Bechet

  8. #7
    Quote Originally Posted by 2bornot2bop View Post
    99.9% of the folks here have never heard a Sequel amp. Congrats, you scored. Where on earth did you find a used Sequel Ravine?
    I found it on reverb, but it was labeled as Verellen (I believe that is the amp designer in Seattle who makes them for Sequel?). Since it had been sitting a while, probably due to that labeling, I then got into a difficult two day negotiation with the place. They kept coming back with the same figure, which I wasn't comfortable with, but eventually I got basically half off new with free shipping and a $90 'studio slips' case included. I do feel lucky. If I don't like the amp for some reason, I will pass it off at a fair price and notify you guys it's up for sale. If I do like it, I'll try to post some clips. It might be hard to find a good time to do that since I live in a condo with shared walls.

  9. #8

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    Since I live near Seattle, I’d probably have grabbed if I’d spotted it first. I think you’ll like it. If you need the Fender mid-scoop sometimes a pedal should get you there. What’s the speaker model?
    (Edit — I misunderstood & thought you meant the Reverb seller was in Seattle.)
    Last edited by KirkP; 11-20-2018 at 08:22 PM.

  10. #9
    Quote Originally Posted by KirkP View Post
    Since I live near Seattle, I’d probably have grabbed if I’d spotted it first. I think you’ll like it. If you need the Fender mid-scoop sometimes a pedal should get you there. What’s the speaker model?
    I'm not sure yet, but I'll let you know when it arrives. I know they were using Fane Alnico speakers in the original builds, but in an interview Verellen stated they had several iterations of the amp. This is a 2017 model, so I'm not sure what they were using then.

  11. #10

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    Okay, it was sold by CME. I wonder why CME labeled it a Verellen. Is it possible that a local owner traded it in and CME didn't know what it was?

    That Ravine was my favorite all time jazz guitar amp. I sampled it at SoundCloud in Seattle, and at the time I was trying to justify paying the $2k price. Now they're what, near $2700? Great amp. If you decide it's not your cup of tea I'd gladly take it off your hands.
    "You've got to be in the sun to feel the sun. It's that way with music too." - Sidney Bechet

  12. #11

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    it's a smart design, cause you get the octal preamp tube grind, but then have 6l6 hi power amp section...so its hot toned but clean!..until you really get super loud...the alnico 12 speaker is only going to make it that much better..and true vintage sounding!...plus it has reverb!! flint is great, but nice to have the reverb in the amp..not pre pre-amp


    should go great with your collection of guitars!...

    cheers

  13. #12
    Quote Originally Posted by 2bornot2bop View Post
    Okay, it was sold by CME. I wonder why CME labeled it a Verellen. Is it possible that a local owner traded it in and CME didn't know what it was?
    Yes, I was wondering this. It is clearly a Sequal Ravine, right? I think Verellen built the amps for them, so maybe that stamp is on it somewhere, and they didn't know any better? I will have to check. Only thing I was nervous about is the speaker didn't look like a known one that they use, but I'll see when it arrives.

    So, a head's up for anyone looking for one of these: you might find it labeled as Verellen, since, to my understanding, Ben Verellen builds these for Sequel. Here is an interview on their collaboration:

    Bench Press: Ben Verellen of Verellen Amplifiers | Fretboard Journal


    That Ravine was my favorite all time jazz guitar amp. Great amp. If you decide it's not your cup of tea I'd gladly take it off your hands.
    Well that is great to hear! If I don't like it, I will notify you all that it's up for sale. It arrives Friday, so I'll give some feedback then.

    If anyone has more info on these please do share. Especially sure about the speakers used on the 2017 models.
    Last edited by beeswax; 11-21-2018 at 02:06 AM.

  14. #13
    Attached is an image of the speaker, from the ad.

    The two speakers I know were used in these are the WGs12 and Fane Alnico. From reference pictures I've been able to pull of these speakers, it doesn't resemble either. I'm a bit concerned the original speaker might have been replaced. I'll have to see what information is on the speaker and if there is any evidence it's been replaced once it arrives. Does anyone recognize that speaker? I know it's not a great photo. I didn't think to ask about that before buying because usually CME documents anything unoriginal, but I should have, given that they didn't even seem to know what amp they had.

    I added a 2nd photo for those who don't know these amps -- one of the cool things, visually, is how they use bass and treble clef images on the amp instead of writing the words. I thought that was a super nice touch.
    Attached Images Attached Images Sequel Ravine-n8h2zyhf0loszavojr3d-jpg Sequel Ravine-ctcqsw31l3ri4dzv2dwy-jpg 

  15. #14

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    Michael Biller is the only dealer of these Sequel amps. I understand that it was made for and in collaboration with Michael Biller's Sound Island Music by Ben Verellen under the Sequel brand name. beeswax, email Michael; he can probably fill you in on the original speaker.

    As for the speaker in situ, the basket looks like a blue frame. It also looks as if a CD has been stuck over the label to deflect the heat from the power tubes/valves. My guess is that it is a Weber Ceramic Blue Dog.

    The Ravine was pretty expensive new, $2500, if I am not mistaken. If you paid half for it, I think you got a pretty good deal.

    PS Run it for a few hours when you get it. If you have a looper, feed it with a looped guitar signal. And then play your guitar through it. You want to listen out for distortion or loss of clean headroom at normal playing levels for jazz when the amp is cooking. I have a suspicion the heat from the power tubes/valves is not playing nicely with the speaker driver. And that is why the owner sold it. Design shortsightedness possibly. Not trying to be a wet blanket here. I may well be very wrong about it. Re-housing it in a head cab or a larger combo cab may alleviate the issue. What looks to be a CD stuck over the label has to be there for heat deflection. Can't think of any other reason for being.
    Last edited by Jabberwocky; 11-21-2018 at 01:37 PM.

  16. #15
    Thanks for that; I will look for that issue. So you're saying the tubes should be further to the right so they're out of the way of the speaker?

    Wouldn't they pick up on that design flaw by now, though? They have been making them since 2013, and this is a 2017 model.
    Does anyone know if a Weber Ceramic Blue Dog has ever been used as the factory speaker in these amps?

  17. #16

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    Quote Originally Posted by beeswax View Post
    Thanks for that; I will look for that issue. So you're saying the tubes should be further to the right so they're out of the way of the speaker?

    Wouldn't they pick up on that design flaw by now, though? They have been making them since 2013, and this is a 2017 model.
    beeswax, I cannot be sure which is why I suggest that you test it for a few hours to get it cooking. I would have made the cabinet much taller so that the tubes/valves clear the speaker magnet but it loses then its cuteness cuboid factor. It will probably work as intended for one to two hours until the heat builds up in the magnet. Over time, heat will degauss the magnet. This is just a wild guess on my part.

    It is a small boutique amp. Boutique is as boutique does. They don't sell in enough numbers to have a pressing need to address issues. Again, just wild speculation on my part.

    Test it and see for yourself.

    This is what I got off the web: When heated above 176° Fahrenheit (80° Celsius), magnets will quickly lose their magnetic properties. The magnet will become permanently demagnetized if exposed to these temperatures for a certain length of time or heated at a significantly higher temperature (Curie temperature).

    In close proximity to those output tubes/valves, 176F/80C is quite readily achieved. Perhaps the previous owner got tired of replacing speaker drivers. Again, just speculation on my part.

  18. #17

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    verellen use wgs speakers ...thats probably one but without the label sticker!!..it's a ceramic mag speaker...its proximity to the power tubes may have caused the label to peel off...or they peeled it off as a preventative

    the power tube 6l6 positioning is going to make speaker changes tricky..pretty sure an alnico speaker with bell will not fit...tight little cabinet

    the heat with an open back cab shldnt be an issue...tho not ideal


    the images for tone and volume knobs is something orange amps has been doing since the 60's..

    cheers

  19. #18

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    That amp was originally designed with an Alninco speaker as part of its design philosophy, was it not? I heard Michael’s, Sound Islands, Ravine with an Alninco speaker. I was so enamored with its sound I don’t recall the speaker inside. Regardless, that Ravine is an amp aimed for a purist audiophile who believes guitars are pretty kewl, too. You heard it here first.
    "You've got to be in the sun to feel the sun. It's that way with music too." - Sidney Bechet

  20. #19
    I wrote Michael to ask and linked him to this thread, so hopefully we get clarification on some of the issues brought up.

  21. #20

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    Quote Originally Posted by beeswax View Post
    I wrote Michael to ask and linked him to this thread, so hopefully we get clarification on some of the issues brought up.
    Oh good. At minimum I'll learn if I'm coming down with Alzheimer's.
    "You've got to be in the sun to feel the sun. It's that way with music too." - Sidney Bechet

  22. #21
    From Michael:


    All I can say about the RAVINE is that since we switched to the WGS 12L we have not had any complaints about the sound, performance, or longevity of our RAVINE combos.
    Plus we have a very strong warrantee: you return the amp to us, we fix it for free, then return it to you. We are quite proud of our accomplishments and want to share the fine musical sounds with others who believe in what we do and how we do it.

    There is a lot of crazy perhaps well intentioned "information" on the web forums. Originally we were going for a more 1950s sound with an AlNiCo speaker but these didn't hold up as well as we'd wanted. These included the FANE A60 and a Weber knock-off based on their Blue.

    Michael
    So it seems like this speaker could be a problem, after all. I'm surprised they used a "knock-off" (sounds cheap) since they are known for using premium parts.

    We will see what arrives. Now I'm thinking I got a bad deal...
    Wishing I just bought a GA-40 or 50.

  23. #22

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    don't get too hung up on the speaker...alnico magnet speakers are more susceptible to damage from heat and stress...why they typically have a plastic bell covering the magnet...it gives distance and protects...the ravine is very tightly packed cab...many alnicos won't fit..so ceramic speaker is gonna be way to go...

    if not satisfied with stock speaker, look into a celestion creamback...ceramic but very vintage alnico sounding speaker,,great speaker

    plus michael basically just told you they take care of any problems...thats pretty darn good customer service...keep the faith..its a fine amp


    and you have some nice gear (guitars-pedals) to match up with it

    it's gonna be good

    cheers

  24. #23
    Hey thanks, Neatomic.

    A bit more info from Michael. I asked when they switched to the WGS-12L


    I don't recall offhand but likely about 2-years ago if not more. My personal favorite speaker in the RAVINE was the FANE 12 AXA AlNiCo 100-watt but unfortunately the company discontinued making that model which is a shame in my opinion.

    At their recommendation we then tried the FANE A60 but it produced an odd "gas passing" type noise at low frequencies in the RAVINE circuit. We then used the Weber custom version on a few amps but it didn't quite have the sound of the FANE so we kept on researching others.
    The WGS 12L works nicely in the RAVINE producing a highly pristine transparent accurate sound of the guitar. Plus it is shallower thus giving more room for the power tubes. The only downside is that it adds weight...the speaker itself weighs about 18-pounds.

    Anyhow, enjoy your new-to-you RAVINE and focus on making music with it; in the end that's what it's all about!

    Best regards,
    Michael

  25. #24

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    yeah..michaels on point..fanes were great speakers..go way back to classic hi watt amps..but many changes and rebrands since..

    he also realizes they are facing a space problem..as far as housing a speaker within the ravine cab..they found one they like, that fits...ok

    tho check out the celestion creamback, if not satisfied..its premium speaker..but worth it...if it fits!!

    but also agree with michael- play don't worry!- mick ronson

    cheers

  26. #25
    Quote Originally Posted by neatomic View Post
    yeah..michaels on point..fanes were great speakers..go way back to classic hi watt amps..but many changes and rebrands since..

    he also realizes they are facing a space problem..as far as housing a speaker within the ravine cab..they found one they like, that fits...ok

    tho check out the celestion creamback, if not satisfied..its premium speaker..but worth it...if it fits!!

    but also agree with michael- play don't worry!- mick ronson

    cheers
    Thanks! I'm going to see what is in it first on Friday, then see how it sounds, and then go from there. If I need recommendations I'll come back here, though I have yours jotted down. Thanks again.

  27. #26

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    Nice. I've used a Sequel amp and love them. Michael is a solid dude and knows his stuff. He's a player too, and a good one at that. 7 String. I like it when the person that makes and sells the product actually uses it and knows what it's intended to do. Congratulations on the score. I'm guessing you're going to like it!

  28. #27

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    Okay, so it was the Fane 12 AXA Alninco that was in the Ravine I sampled. Man, I've never heard a better sound from a small amp. I should have bought it!
    "You've got to be in the sun to feel the sun. It's that way with music too." - Sidney Bechet

  29. #28
    Quote Originally Posted by 2bornot2bop View Post
    Okay, so it was the Fane 12 AXA Alninco that was in the Ravine I sampled. Man, I've never heard a better sound from a small amp. I should have bought it!
    I'm hoping that speaker's in mine, since Michael also said the same thing. I see some blue in the auction photo, and that Fane 12AXA is blue from the research I did. Hoping it's a Fane with a cover on it. We'll see tomorrow!
    Ps. You can probably find a Sequal used and buy it if you're diligent on Reverb. Just setup a daily search/feed.

  30. #29

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    Quote Originally Posted by beeswax View Post
    I'm hoping that speaker's in mine, since Michael also said the same thing. I see some blue in the auction photo, and that Fane 12AXA is blue from the research I did. Hoping it's a Fane with a cover on it. We'll see tomorrow!
    Ps. You can probably find a Sequal used and buy it if you're diligent on Reverb. Just setup a daily search/feed.
    They don't come up often. I've seen 2 since passing on that Sequel 5 years ago. What speaker was in yours?
    "You've got to be in the sun to feel the sun. It's that way with music too." - Sidney Bechet

  31. #30
    Well, some excellent news. The amp just arrived, and it came with the FANE 12" AXA, 8ohms.
    It even has a date code on it of 16 03 15, which I am thinking is March of 2016 based on what Michael said about them switching from these speakers a bit over two years ago. The downside is this speaker looks like it will be very close to the tubes, but Micheal and someone in this thread both agreed this is the best speaker in this amp, so that was great to see. If there are issues I'll go to the lower profile one.

    Time to plug it in and see how it sounds...and hope UPS didn't destroy it!

  32. #31

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    yeah, looked pic over again, the speaker posts (red-green) showed it was a fane..but the remedy to make it fit the cab is not a good one...they removed the bell cover..which protects the sensitive alnico mag from heat, dust, hits etc...not a good idea to run alnicos sans the bell covers...i get why they did it..it wouldnt fit otherwise..but not optimum..especially as the power tubes are right up on it

    great speaker tho...but precarious positioning



    cheers

  33. #32
    Quote Originally Posted by neatomic View Post
    but the remedy to make it fit the cab is not a good one...they removed the bell cover..which protects the sensitive alnico mag from heat, dust, hits etc...not a good idea to run alnicos sans the bell covers...i get why they did it..it wouldnt fit otherwise..but not optimum..especially as the power tubes are right up on it

    great speaker tho...but precarious positioning


    Man, that sucks so bad. Is there anything I can do to minimize issues?

    The amp sounds AMAZING. Only got to play it 5 minutes so far, but incredible. Possible the best I have ever heard. The only thing I don't like is the reverb. It sounds wonderful, but when turned up, it gets noisy. I'm not sure why that is happening.

    I'm giving it a 9/10. The only knock being the design/speaker issue and the reverb seems a bit noisy.
    The tone is insanely good. Better than the clips on their website.

  34. #33

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    might need to change out the reverb driver tube...prob a 12ax7..confer with michael

    the speaker..you can always get remagnetized down the line if need be...prob the real reason they moved to wgs ceramic speakers

    just play it and enjoy


    cheers

  35. #34
    Quote Originally Posted by neatomic View Post
    might need to change out the reverb driver tube...prob a 12ax7..confer with michael

    the speaker..you can always get remagnetized down the line if need be...prob the real reason they moved to wgs ceramic speakers

    just play it and enjoy


    cheers
    Thanks. Yeah it looks like a 12ax7, and those so I'll swap one out, and see if the reverb gets quiet.

    My band gigs are sometimes 3hrs or so. Should I give the amp a rest at times to prevent the speaker from having issues? There is about a finger to a finger and a half of space between the tubes and the speaker. I just played for about 25 minutes...the power tubes were hot, and the speaker had zero heat to the touch, which was surprising given how close they are.

    What I don't understand is why he didn't put the power tubes off to the right where there is much more space.

  36. #35

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    hah depends what kinda guy you are..cautious or wing it!!...i'd let it ride..but keep an ear out for any weird changes in tone down the line...

    but in meantime play the thing and enjoy...prob sounds great with jm and duncan antiquities!!


    cheers

    ps- these days everyones trying to make a smaller lighter more compact combo amp, but with all the punch and greatness of big amps...compromises are made..transformers, tubes, speakers...lots going on...real estate is prime in a small cab

    fact that its got good sized open back ..has some breathing room..really helps

  37. #36
    Quote Originally Posted by neatomic View Post
    fact that its got good sized open back ..has some breathing room..really helps
    Yeah the heat can go out the large open back, which is nice. Surprisingly there was no heat on the speaker. Maybe somehow this works. Time will tell. I have practice tomorrow so I'll work it more.

    I look in the cab and see so much space on the upper right. Just seems he should have put the power tubes there instead of right behind the speaker. There must be some reason for it, but it's beyond my pay grade.

    Man, this amp sounds great!

    Going to swap the reverb tube now and hopefully fix that issue. It is super noisy past 3.

  38. #37
    Unfortunately the reverb is super noisy even with a new tube.

  39. #38
    Tomorrow I am going to bring the amp to a tech to diagnose the reverb noise. CME said to do this, which was very cool.

    My initial review of the amp: the bass notes are so tight with a warm roundness to them. I've never heard anything like it. The highs are crystalline. Almost too pure. There is no room for bad technique using this amp. Anything can and will be heard. In that regard, it will make you a better player. The clarity and definition in all registers is insane. Onboard reverb, while noisy past ~1.5 on the dial, sounds very good even at that low setting. I imagine it will sound excellent if/once fixed. If so, this thing is going to be a lifelong amp. I can't fully recommend it yet until I figure out how serious the noise problem is.

    On the phone, the amp technician said sometimes noisy reverb is as simple as loose cables, and sometimes it's a bad circuit design. I really hope it's not the latter. Will report back tomorrow with his findings. Oh, and played another half hour tonight...no heat on the speaker. I'm not sure how, but it's room temperature to the touch. The heat must be dissipating through the open back. 3hr band practice will be the true test, though that might not be until next Saturday if the amp is in the shop tomorrow night.
    Last edited by beeswax; 11-23-2018 at 11:31 PM.

  40. #39

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    I think Weber offers AlNiCo speakers with or without the bell covers. You might see what their site says about it. I think the main function of the cover is to prevent impact. AlNiCo magnets are brittle and can be demagnetized by impact. I think they can also be demagnetized by touching another strong magnet. I doubt a tube a few inches away in an open backed cab could raise the magnet temp enough to demagnetize it. Wikipedia says alnico magnets can typically operate up to 1000-deg F. Bottom line: With reasonable care I wouldn’t worry about the cover.
    Last edited by KirkP; 11-24-2018 at 02:26 PM.

  41. #40
    That confirms what I found, Kurt. From Jensen:

    "Alnico speakers are available with or without an end bell (purchased separately). The end bell is for aesthetics only and has no effect on the sound of the speaker"

    From what I read it's common to have no cover. I guess the only debate would be if it's okay when that close to the tubes in a combo.

    Also, this image shows even without a cover, they still have a back plate covering the magnet.
    http://www.lansingheritage.org/image...sum/page03.jpg


    I'm thinking it will be fine under normal use, but I will ask the amp technician today. Amp design is not my forte at all, so this is all new. I'm sharing it here in case someone else has the same questions about this amp in the future.

  42. #41

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    Quote Originally Posted by beeswax View Post
    That confirms what I found, Kurt. From Jensen:

    "Alnico speakers are available with or without an end bell (purchased separately). The end bell is for aesthetics only and has no effect on the sound of the speaker"


    well the plastic bell cover does not affect tone..this is true..but beyond aesthetics, it does protect...from dust (magnetic particles accumulating on mag), heat and takin hits...bell covers certainly always a good idea...especially in open back cab or combo...

    sans cover in a closed back speaker cab, your chances are way better...hence the option


    cheers

  43. #42
    So, bad news from the tech. He feels it's a design flaw where there are too many components jammed too close, causing the noise. Here's a video of the issue. It's on an iphone, and actually sounds noisier in-person (listen with headphones if you can). You can hear a low 60hz hum at the very beginning when the reverb isn't even on, and then you can hear the more obvious noise when I engage the reverb.



    I also attached an image so you can see inside. The tech (he actually builds amps) said to him the noise is unacceptable levels, and the reason he feels it's that way is all the components jammed closely together inside such a small space. Though, he said to truly get to the root of the cause he'd need more time with it. Said it could be a bad component, but is more likely a design issue. So, to those who own or played Ravines, did they make noise like this?

    This is a real bummer. CME doesn't want to invest in fixing it due to the uncertainty of the issue, so I am likely going to have to return it. We're still trying to brainstorm how to get it fixed. The tech is going to write Michael and ask some questions to see if helps identify the issue, but if not it's a return. Hugely depressed. What a great sound otherwise.
    Attached Images Attached Images Sequel Ravine-img_2481-jpg 

  44. #43

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    That’s too bad. Is the noise the same with the reverb tank disconnected? Have you tried replacing the tube immediately after the reverb tank? Those are easy things that might give you clues.

  45. #44
    Quote Originally Posted by KirkP View Post
    That’s too bad. Is the noise the same with the reverb tank disconnected? Have you tried replacing the tube immediately after the reverb tank? Those are easy things that might give you clues.
    Would that be the first power amp tube? I only tried replacing the 12ax7, since I think the reverb runs on that tube, and it did nothing. I'm not sure if the tech tried switching out that power tube. My guess is he did, but I can't remember him speaking to it specifically. The tech said the noise was there with the reverb tank disconnected, and I think that lead him to conclude it was something with the design. He didn't say that is 100% certain, but said components were very close inside and there were no bad wire connections or other common reasons. He only did a cursory 30 minute look over for obvious problems, though, because we were trying to keep costs down. He said he can pinpoint the issue better, but that will take a few hours. I asked CME if they'd approve that, and they said the uncertainty of that makes them prefer a return. We're trying to figure it out. CME says they go over these before shipping out, and it should not/would not be sent out like that, so it's possible it was damaged in transit, too. I'm hoping for a good outcome somehow, but doesn't look promising...

  46. #45

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    The Ravine I demo'd was noiseless. The amp was projecting from a dead quiet deep black background, much like a quality audio amplifier. That's what drew me to the amp...that and its exquisite tone. I don't use reverb. I'd still consider buying that amp.

    That sounds like ground loop transformer hum
    "You've got to be in the sun to feel the sun. It's that way with music too." - Sidney Bechet

  47. #46
    Quote Originally Posted by 2bornot2bop View Post
    That sounds like ground loop transformer hum
    Thank you, what is the cause of that, and what is the fix for that?
    Also, thanks for letting me know yours was noiseless.

  48. #47

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    looks like you have 4 tubes there...the leftmost is the octal preamp tube..the 12ax7??? is prob reverb driver...and then the 2 6l6's r power tubes


    since the worst hum is just when the reverb is turned on..you can discount the octal and the power tubes...are u sure the smaller 2nd tube is a 12ax7?? it cld be they used a 12at7..also that could be a problem with the reverb pan..they are attached by very thin wires on each end..sometimes they disconnect and cause that kind of hum

    if the tube is the right one..12ax7..then try disconnecting reverb pan from circuit...if hum goes..you know its on the pan side...

    that kind of tightly packed amp can always be tricky..but i doubt thats the source of that reverb hum like that..it would have never left the factory if that was happening

    check this quick vid



    luck

    cheers

  49. #48

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    Quote Originally Posted by beeswax View Post
    Thank you, what is the cause of that, and what is the fix for that?
    Also, thanks for letting me know yours was noiseless.
    Typical household circuit noise. Refridgerators are a common culprit. That's why audiophiles will generally have dedicated circuits from their audio room directly to a homes circuit box. I used to have transformer noise. No more. That hum sounds like a typical 60 Hz transformer hum. I'd try the amp using an AC cheater plug. If the noise disappears, you know what the issue is.
    "You've got to be in the sun to feel the sun. It's that way with music too." - Sidney Bechet

  50. #49

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    Quote Originally Posted by neatomic View Post
    looks like you have 4 tubes there...the leftmost is the octal preamp tube.
    That far left tube is a 6SN7. Old school audiophile tube. I use them in my audio preamps. Great tubes!
    "You've got to be in the sun to feel the sun. It's that way with music too." - Sidney Bechet

  51. #50

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    I’m puzzled. Typically an all-tube amp would need at least two triodes for the preamp, one or two for the phase inverter, and two or three dedicated to reverb. I only count four triodes in the Sequel, plus the two power tubes. I wish I could see a schematic.
    ...
    Poking through old Gibson amp schematics, I see that a few had an interstage transformer between the preamp and power amp, eliminating the need for tubes in the phase inverter. That would free up the 12AX7 to be dedicated to reverb. Attached is a Gibson schematic with an interstage transformer (with some mods to eliminate the field coil speaker).
    Add a 12AX7 for reverb and you might have something like your amp. It would be interesting to see a photo of the other side to count transformers.
    Last edited by KirkP; 11-25-2018 at 12:41 PM.