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  1. #1

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    Been looking at this amp recently, but there's so little about them online. It's a 20W tube/ss hybrid. Anyone knows them, or at least the bigger 45W version?

    I already own a 1978 Fender Pro Reverb and it's probably the greatest amp I'll ever get to play, but it's huge and it weights almost as much as my girlfriend, so I can't justify lugging it to certain gigs. I bought a ZT Lunchbox with its matching cabinet but I don't really like its sound that mutch, the single 'tone' cntrol knob is not enough for me, plus it's already broke twice, so I'm getting rid.

    So I'm looking at the Jupiter Junior. It costs more than DV Mark Little Jazz or the ZT, is that justified?
    I play modern jazz, love nice clean tone but also use overdrive, delay, reverb and some synthy effects.
    so any opinions very welcome, and suggestions for other smallish or medium-sized amps around the €500 mark.

    Thanks!


    Koch Jupiter JUNIOR 20W-koch-jupiter-junior-20w-jpg

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    The Jazz Guitar Chord Dictionary
     
  3. #2


    Here's the one and only demo of the amp on the internet.

  4. #3

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    Haven't played the 20W one, but the Jupiter 45 is an excellent amp that I would happily recommend. Great cleans, a very usable gain channel, nice reverb and sounds great at low volumes.

  5. #4
    Ok thank you. I see there's one used in Germany, but it's had its original speaker replaced by this;
    12" Tornado Classic 100 | Jensen Loudspeakers
    Any opinions on this, is it an upgrade on stock speakers?

  6. #5

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    Don't know anything about that amp, but Koch amps seem to have a very good reputation in general.

    Their new "The Greg" (Greg Koch signature amp) I want very badly; I think it would be the perfect do-all gigging amp (not for jazz, for everything else).

  7. #6

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    Quote Originally Posted by IbanezAS100 View Post
    Haven't played the 20W one, but the Jupiter 45 is an excellent amp that I would happily recommend. Great cleans, a very usable gain channel, nice reverb and sounds great at low volumes.
    I agree - I've had a few of these that I got from Koch at NAMM. My impression of the Jupiter Jr. is that it's the same, just smaller. I played it at NAMM last year and this year, but ended up grabbing the last Koch SE-6 and SE-12 instead (these are no longer available, which is a bad move by Koch [ed: as of 2020, they are back]).

    Quote Originally Posted by ruger9 View Post
    Don't know anything about that amp, but Koch amps seem to have a very good reputation in general. Their new "The Greg" (Greg Koch signature amp) I want very badly; I think it would be the perfect do-all gigging amp (not for jazz, for everything else).
    They make great amps. I've used the Jupiter, Studiotone head and combo, Studiotone XL head and combo, Twintone II combo, Twintone III head, SE-6 and SE-12 combos, and 2x12 and 4x12 cabs. Great amps, less-than-great distribution and marketing.

    They were slowed down by various difficulties for awhile, but they are now making a bunch of Greg amps to catch up, and have a new North American distributor (SFM out of Montreal - we'll see how they do). No reason why the Greg wouldn't work great for jazz, BTW. Sort of like a Fender Vibrolux Reverb but with a pile of additional functionality.
    Last edited by Hammertone; 11-21-2020 at 07:29 AM.

  8. #7
    Hey Hammertone, thank you for replying.

    What would you say are the main differences between the Jupiters and the Classic SE's? Did it ever bother you that the Classic SE only has the single tone knob, or did the two bass/mid swithces have a large enough effect on the tone?

    And how big are the differences between the smaller (jupiter20 & se6) and bigger models (jupiter45 & se12), is it just the power, or also quality of sound? Could you do a gig with a drummer with the smaller ones? There are quite a few Classic SE's available used in Italy, so I might have a look.

    Lots of questions, I know thanks

  9. #8
    While you’re waiting, here’s a Hammertone inspired video of a Hofner Jazzica being played through a Studiotone.

  10. #9

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    Quote Originally Posted by Kunji View Post
    What would you say are the main differences between the Jupiters and the Classic SE's? Did it ever bother you that the Classic SE only has the single tone knob, or did the two bass/mid swithces have a large enough effect on the tone?

    And how big are the differences between the smaller (jupiter20 & se6) and bigger models (jupiter45 & se12), is it just the power, or also quality of sound? Could you do a gig with a drummer with the smaller ones? There are quite a few Classic SE's available used in Italy, so I might have a look.

    Lots of questions, I know thanks
    Totally different amps, different design, different purposes.
    The Classic SE-6 and SE-12 are little Class A screamers. Great for practice, great for recording. In the same kind of space as a Fender Champ, but with a 12" speaker, a few neat and useful features (can drive an exterior cab at 4/8/16 ohms; three very useful tone mini-switches, tone control, master volume, recording out). The SE-6 toggles between 6 and 2 watts, and the SE-12 toggles between 12 and 4 watts. The SE-6 can be powered with a 6V6 or an EL84 power tube for different sounds. the SE-12 can be powered with a 6L6/5881 or an EL34 for different sounds. The idea was to make a simple amp with a fairly direct line between the input jack and the speaker. It just so happens that they are in relatively small, light, portable boxes. Originally, they both came in the same teeny box. Then Koch decided to put the bigger one in a bigger box, even though the amp guts are the same size. They remind me of simpler (and much less expensive) versions of the original Carr Mercury (a Class A amp that toggles between 8, 2, 1/2 and 1/10 watt).

    OTOH, the Jupiter is a highly practical, compact, hybrid, gigging amp, designed to provide a lot of tonal versatiity in a lightweight, cost-effective manner. 45 watts is perfect for all sorts of gigs. It covers a lot of ground, sounds great for what it is, and represents great value. To me, the 45 watt Jupiter is really the most useful as a gigging jazz / blues / rock /all-purpose amp. The 20 watt Jupiter JR. might pull its weight, but I haven't tested it out in a gigging environment and don't have one to play with here.

    I wouldn't classify them by grouping them as "
    jupiter20/se6" and "bigger jupiter45 & se12", since I would not use either SE model on a gig except a blues gig where distortion would be appropriate, or a very quiet solo/duo jazz gig. I specifically got the SE-6 for blues jam sessions because it's so easy to throw in the car. I only sold it because someone really wanted it and showered me with an appropriate pile of money.

    My SE-12 is now the subject of some mad science, because the box is big and empty - I am in the process of shoe-horning a 15" JBL K-130 into it, strictly for laughs. I really like wide-range 15" speakers, and that JBL has a 103 db SPL, so it might turn out to be a useful little jazz amp as well as a fantastic compact blues amp. I can also use it as a mini-cab for my Koch Studiotone. We shall see.



    Attached Images Attached Images Koch Jupiter JUNIOR 20W-koch-se12-15-test_5150-jpg 
    Last edited by Hammertone; 09-03-2019 at 04:09 PM.

  11. #10
    Wow, thanks for a very informative post.
    I'm pretty sure the Jupiter is what I need. I have the option to get a used 45 with a new Jensen speaker for less than the price of a new 20, so I think I'll go for that.

  12. #11

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    Here's another neat trick if you get a Koch Jupiter Combo.
    It is the same width as the Koch Studiotone Plus head. Or accommodates a smaller-footprint Studiotone head. I did this with a Starpooper Combo (identical to a Jupiter but black vinyl covering instead of green, with minor voicing differences) box that came back to me without the amp in it. Cool beans all around!
    Attached Images Attached Images Koch Jupiter JUNIOR 20W-koch-mini-mini_7140-jpg 
    Last edited by Hammertone; 11-21-2020 at 07:31 AM.

  13. #12

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    Koch is in very close cooperation with Jensen. My former Studiotone 20W had a Jensen-made driver that weighed a ton. Never got ´round to swapping it as the amp was our reference while testing TOOB prototypes. However, Rudi Koch recommended the 12" Tornado, which is now standard in my 12" cabs. Well over a hundred installed, not a single lemon. On request, I also make 10" versions, both basic and telescopic, using the Tornado 100. It's probably the best-sounding Neo speaker I've come across. It costs over twice as much as the original Falcon, and there's no weight saving, so it's got to be an upgrade from a tonal point of view. This is, of course, a matter of taste.

    BTW, the 20W Jupiter Junior has been listed by Thomann since August last year. Not a huge seller, ranking #125 among tube combos, but all three reviewers give it straight five stars. Weight: 12 kg. Hmmm... that's why I'm in the business.

  14. #13

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    Sica in Italy makes Jensen, MOD and a variety of other branded speakers, as well as OEM speakers for Koch, AER and others.

    The Koch Jupiter series are hybrid amps, with solid-state power sections (modified with Koch "ATR" tech, that uses a 12ax7 to get the power section of the amp to work in a tube-like way), and some tube functionality in their preamp sections (12ax7 preamp tube). Practical, compact, inexpensive, good-sounding gear.

    The Studiotones and Twintone III series are full-featured tube amps, with significantly more functionality and higher price tags. Great amps, IMO, but Koch has no real presence in North America.
    Last edited by Hammertone; 11-21-2020 at 07:33 AM.

  15. #14

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    I really appreciate this post - I was unaware of these amps and they may just be what I've been looking for. I've been trying to find a Princeton Reverb style amp with an attenuator and a line out, and after a lot of research I concluded that the best value is probably a '65 PRRI and an Ironman Mini. It sounds like this could be a compromise choice for a lot less. Unfortunately I've had a hard time discerning from the few youtube clips I've heard, including the excellent one above from Roli Muller and Torsten Goods, whether the Jupiter (Jr. or 45) can generate a Fender-ish tone. If any of you have heard one in person and can comment I'd appreciate it.

  16. #15

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    Probably too late for the original poster, but I ordered a Koch Jupiter Junior today. Now the wait begins..

    Quote Originally Posted by Hammertone
    Great amps, less-than-great distribution and marketing.
    After looking into this amp and talking to a local distributor about Koch, this is a good summary.

    There is seemingly little info on these out there, so I will try to give some impressions once it arrives and do a longer review once the honeymoon period has settled down. My first NAD in a long time!

  17. #16

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    Quote Originally Posted by Hammertone View Post
    Totally different amps, different design, different purposes.
    The Classic SE-6 and SE-12 are little Class A screamers. Great for practice, great for recording. In the same kind of space as a Fender Champ, but with a 12" speaker, a few neat and useful features (can drive an exterior cab at 4/8/16 ohms; three very useful tone mini-switches, tone control, master volume, recording out). The SE-6 toggles between 6 and 2 watts, and the SE-12 toggles between 12 and 4 watts. The SE-6 can be powered with a 6V6 or an EL84 power tube for different sounds. the SE-12 can be powered with a 6L6/5881 or an EL34 for different sounds. The idea was to make a simple amp with a fairly direct line between the input jack and the speaker. It just so happens that they are in relatively small, light, portable boxes. Originally, they both came in the same teeny box. Then Koch decided to put the bigger one in a bigger box, even though the amp guts are the same size. They remind me of simpler (and much less expensive) versions of the original Carr Mercury (a Class A amp that toggles between 8, 2, 1/2 and 1/10 watt).

    OTOH, the Jupiter is a highly practical, compact, hybrid, gigging amp, designed to provide a lot of tonal versatiity in a lightweight, cost-effective manner. 45 watts is perfect for all sorts of gigs. It covers a lot of ground, sounds great for what it is, and represents great value. To me, the 45 watt Jupiter is really the most useful as a gigging jazz / blues / rock /all-purpose amp. The 20 watt Jupiter JR. might pull its weight, but I haven't tested it out in a gigging environment and don't have one to play with here.

    I wouldn't classify them by grouping them as "
    jupiter20/se6" and "bigger jupiter45 & se12", since I would not use either SE model on a gig except a blues gig where distortion would be appropriate, or a very quiet solo/duo jazz gig. I specifically got the SE-6 for blues jam sessions because it's so easy to throw in the car. I only sold it because someone really wanted it and showered me with an appropriate pile of money.

    My SE-12 is now the subject of some mad science, because the box is big and empty - I am in the process of shoe-horning a 15" JBL K-130 into it, strictly for laughs. I really like wide-range 15" speakers, and that JBL has a 103 db SPL, so it might turn out to be a useful little jazz amp as well as a fantastic compact blues amp. I can also use it as a mini-cab for my Koch Studiotone. We shall see.



    I'm so glad somebody has played these, I see a couple videos on youtube that sound horrible, but thats typical of most
    I used to own a TwinTone that was a really badass amp, clean and crunch were both fantastic, built in attenuator, and they go for cheap used

  18. #17

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    This one is a nice demo of the clean sound of the Jupiter 45 head/Koch 1x12" cab by Rory Ronde. He's playing a late '60s Hofner 4600, neck position (these typically have underwound humbucking pickups):
    This one of the Jupiter 45 combo is nice as well - gets into some of the overdrive sounds without going nuts:
    Last edited by Hammertone; 06-18-2020 at 10:41 PM.

  19. #18

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    Quote Originally Posted by Hammertone View Post
    This one is a nice demo of the clean sound of the Jupiter 45 head/Koch 1x12" cab by Rory Ronde. He's playing a late '60s Hofner 4600, neck position (these typically have underwound humbucking pickups):
    I really dig the sound of that guitar. Is that a vintage Verythin?

  20. #19

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    Great amp demo videos by multiple competent players in this thread. Those would convince me to consider a Koch amp (if I were in the market). Most amp demos are way to overdriven to give any true representation of where I mostly play.

  21. #20

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    Quote Originally Posted by wzpgsr View Post
    I really dig the sound of that guitar. Is that a vintage Verythin?
    Not quite. The 4600 model has the 1.25" depth of the Verithin, is hollow like the Verithin, and uses the same hardware, pickups and so forth, but was conceived of as a less expensive, much easier to build guitar. It has a bolt-on neck and a body with no binding and innovative solid wood, rounded rims. It sounds and plays exactly like a Verithin. The original Verithin and related models were built from @1960 - 1970.

    Between 1970 and now, Hofner has continued to offer several semis derived from the original Verithin. These have blocks connecting the top and back plates. They also made similar guitar models for Carvin.
    In 2000, the Verythin (note the spelling) was re-introduced by Hofner with a solid spruce block and updated hardware as the Verythin Classic and the Verythin John Stowell. In @2002 Hofner introduced the Verythin Standard, with a stop tailpiece instead of a trapeze tailpiece.

    Getting back to Koch, starting @2004, Hofner started borrowing Koch amps to use at NAMM. Several Hofner artists started using Koch amps, specifically Studiotone, Studiotone XL and Twintone combos, because they offered great clean, tube-driven sound, had decent spring reverb, and were quite compact, reasonably light and well-built. Koch is reasonably well-established in Europe and Japan. Unfortunately, North American distribution had problems, and they subsequently had difficulty delivering products due to supplier issues, so they were unable to grow the brand in North America. Most recently, these issues have subsided, the Greg amp has been an unqualified success, and they have a new North American distributor. OTOH, the Wuhan Virus hasn't been good for anyone, so we'll see if they can make a dent in North America.
    Last edited by Hammertone; 11-21-2020 at 07:37 AM.

  22. #21

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    They should be amazing quality.
    Koch reputation is good.

  23. #22

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    Does anybody have any experience with the classic se 6?
    Or the Jupiter 20 for that matter?

    How do they hold up as an amp for home-use?

  24. #23

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    Marcel:
    Check the earlier posts. I think either of them will hold up very well for home use. They are well-built amps. But they are very different amps from each other - the classic SE6 is a Class A tube amp with one main sound that can be played with, in an open-back cab, while the Jupiter 20 is a more powerful amp that is more of a chameleon and can provide a much wider range of tones, in a closed-back cab.

    The other thing to note is that, in addition to recording outs, both have external speaker jacks (8 ohm only for the Jupiter 20, 4/8/16 ohm for the SE6), which allows for completely different sounds through different speaker cabs. No effects loop on the SE6.

    I don't work for Koch, but
    I do like their gear, and I have worked at their booth at NAMM in the past, demo-ing their amps. And I used to borrow a small combo from them to use demo-ing the guitars at the Hofner booth at NAMM - always a very nice combination.

    Last edited by Hammertone; 09-06-2020 at 04:56 AM.

  25. #24

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    Thanks. I owned a twintone years ago, so i’m familiair with the brand.

  26. #25

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    Somehow I seem to have missed this thread until today. The Jupiter Junior looks like a really handy little amp and very reasonbly priced.

  27. #26

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    It does. The 45 watt version is equally interesting, but weighs about 20 kg.

  28. #27

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    I really like the classic se 6, but i can't really demo one somewhere (except ordering one and sending it back, which i don't like doing). I can demo the jupiter 45 nearby, which i will do this week. I don't like the 20 kg's, but on the other hand: it'll be for home use.

  29. #28

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    Quote Originally Posted by Marcel_A View Post
    I really like the classic se 6, but i can't really demo one somewhere (except ordering one and sending it back, which i don't like doing). I can demo the jupiter 45 nearby, which i will do this week. I don't like the 20 kg's, but on the other hand: it'll be for home use.
    You can always swap in a neo speaker to cut the weight by a lot.

    For home use, who cares about weight? I regularly use an Ampeg VT-22 at home,- it sounds glorious, weighs 88 pounds, and I don't care. I do not move it at all except to vacuum behind it, and it has casters.

  30. #29

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    Well, I have had the Jupiter Jr since late July and put in at least 35-40 hours of playing into it at home. The summer has been a bit crazy so I have been away from the forum a lot, I have a couple of unread private messages, sorry about that.

    In short, I am very happy so far. The delivery was delayed a couple of times (not because of Thomann).

    In the beginning it felt a bit cold and odd to me since I bought it sight unseen, a risky move to say the least. But my gamble paid off!

    I feel it is a good workhorse amp that can do lots of styles including jazz. The cleans sound nice to my ears. Previously I have tried the Koch Studiotone and Twintone mark twos, and the Jupiter 20 has that Koch vibe to it. To me, there's a lot of definition of the notes in good way that's familiar from my previous tests with Koch amps. I play a Telecaster and a Jaguar with low-gain pickups.

    The built-in attenuator is very useful, I can get nice singing leads at a bedroom volume (I can hear my upstairs neighbor coughing).

    I think you could do small gigs with this amp, there is a lot of extra volume in the can. It takes pedals well too, sometimes I push the Hot (overdrive) channel with a Boss OD-3 for solos.

    A couple of quibbles/nitpicking:

    - The digital reverb sounds good to me. Spring reverb nuts will probably disagree, but no complaints here. It just responds a bit oddly to my guitars. Somehow it interacts weirdly with the Jag, if I have the reverb at noon with the Tele, the same setting sounds lower/kinda detached with the Jag. Maybe due to the inherent plinkiness of the Jag with lots of moving parts where the energy dissipates? Or that could be my broscience talking. Either way, the reverb is fine but I will get a Strymon Flint at some point for an ampless rig/recording. Interesting to compare reverbs then.

    - I had certain notes flub out/sound really strongly with my Jag (E flat) with the amp. I solved the problem by lifting the amp on a chair, now it's fine and I can hear it much better.

    - Koch touts it as a three-channel amp, IIRC. The "third channel" is the boost setting on the Overdrive channel. In reality this is a preset gain boost that seems kind of superfluous to me since you can't adjust it and it's buzzy. Doesn't bother me and I don't use it. In general, it feels that there is a lot of gain on tap but it sounds best to me on the clean to mid-gain settings. It gets buzzy in the high gain settings IMO.

    - There are very few good demos of this amp out there, Koch likes to show off the super-gainy settings but they should showcase the other range too.

    At this price, this amp gets good marks from me! A great "practice amp" for home use and I could take it for gigs as well. I considered the Tone Master Deluxe Reverb, but paying circa 500 euros for an amp assembled in the Netherlands vs +1000 euros for an amp made in China makes the deal sweeter.

    I recorded a couple of iPhone clips today, let's see if I can upload them even though they don't do it justice.

  31. #30

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    The main difference between the 20 and 45 watt version seems to be the contour switch. A nice option in my opinion, but how is the 20 watt version voiced? Somewhere in between?

  32. #31

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    Here I ramble through Satin Doll, warts and all.



    Here with the Tele, I started learning Jon Herington´s chord melody arrangement of Fagen´s Maxine on Wednesday so the execution is not yet there.


  33. #32

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    Quote Originally Posted by Marcel_A View Post
    The main difference between the 20 and 45 watt version seems to be the contour switch. A nice option in my opinion, but how is the 20 watt version voiced? Somewhere in between?
    The 20 does not give the choice of assigning the gain boost or reverb on/off to the second footswitch button like the 45. No footswitch is included either, but the 45 comes with one.

    Can’t say how the 20 and 45 compare in terms of voicing. For home use the 45 would feel like overkill size- and weightwise to me.

  34. #33

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    45 watts is no overkill. The little jazz that i use right now is 60 watts. No problem.
    i can buy the 45 for under the price of the 20. Used that is.

  35. #34

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    For the little apartment I inhabit, I wouldn't want a bigger amp. I doubt you can go wrong with either and am guessing they are basically identical save for a few details.

  36. #35

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    My hope is that the contour-switch is not a detail. We'll see.

  37. #36

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    I bought the jupiter 45.
    First impression is very good! Great sound right out of the box. No getting used to or setting anything up. EQ on neutral and it sounds brilliant. With a little tweaking it still sounds brilliant. The OD on this thing is delicious. With the gain on one a clock you get this overdriven sound that feels clean if you don't dig in to much. I love it.

    It's good it comes with a dimmer, because it's freaking loud for 45 watts, probably because of the 12 inch speaker? I play with the dimmer on 1. And that is as loud as my little jazz on 12 'o' clock.

  38. #37

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    After a few hours playing through the cool channel i can comment a little more on this amp. It's hybrid, but it could fool me. It feels and sounds like a tube amp. They did a very good job on this. The dimmer is excellent. On any level you get pretty much the same sound (ofcourse it comes more alive on higher levels).
    The cool channel has a gain knob. It should ad a touch of gritt to the sound when maxed out. Maybe it is because i play on low volumes, but i can't really hear any. It seems a teeny tiny little more edgy.
    The EQ on this amp is subtle. No dramatic changes. Like it should be. The switch that shifts the middle frequenties is very nice. Some may argue that is it also subtle, but subtle enough to make a difference. Switched up, the sound gets more beef. I like it that way, but switched down it's more fenderish (scooped). Maybe a little mellow, but very usable.

    PS: i played the cool channel with the gain pretty high and at a higher volume. The gritt is there. You just need to play the amp louder than practice levels.

    PS: slowly learning more about the hot channel. this channel responses more to the contourswitch. Both settings are very nice, although the midheavy setting seems to be more suited for my taste. The boost delivers lot of axtra punch to your tone. Back in the day when i played rock/funk i would have really liked this little swich. At home it is pretty useless and since i'm pretty much play jazzstandards right now . . .
    Last edited by Marcel_A; 09-18-2020 at 10:14 AM.

  39. #38

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    Oke, a new insight.
    Playing the Hot Channel with the gain very low (around 10 o clock) makes it pretty much a clean channel with a bit more punch than the cool channel. The countour switch should be up, because otherwise it sounds too thin.

  40. #39

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    Quote Originally Posted by Marcel_A View Post
    Oke, a new insight.
    Playing the Hot Channel with the gain very low (around 10 o clock) makes it pretty much a clean channel with a bit more punch than the cool channel. The countour switch should be up, because otherwise it sounds too thin.
    This is a useful trick for any two-channel amp - two versions of clean that can sound pretty different. That's how I typically have mine set up now that I have reunited the head with the cab.
    Attached Images Attached Images Koch Jupiter JUNIOR 20W-koch-s-tone-starpooper_9910-jpg 

  41. #40

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    I guess so, but this is the first time i tried that. Before i was in need of a good OD, so i wouldn't sacrifice that in order to get a second clean channel.
    This startrooper seems pretty much like a Jupiter.

  42. #41

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    Quote Originally Posted by Marcel_A View Post
    I guess so, but this is the first time i tried that. Before i was in need of a good OD, so i wouldn't sacrifice that in order to get a second clean channel.
    This startrooper seems pretty much like a Jupiter.
    It is a Jupiter with different OD voicing on the second channel (more distortion for more "modern" sound). And it's black. It came w/ a 90-watt Koch/Sica speaker instead of the 60-watt Koch/Sica speaker in the Jupiter. I guess they thought that metalheads would be blasting away with tons of gain at higher volumes and might need a heavier speaker. The amp had such a stupid name that it was immediately discontinued.
    Last edited by Hammertone; 10-18-2020 at 03:05 AM.

  43. #42

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    Quote Originally Posted by Hammertone View Post
    The amp had such a stupid name that it was immediately discontinued.

    Whoever thought Startrooper was a good idea? It would be a name my son (ten years of age) would like, maybe.
    Anyway, Jupiter sounds more distinguished.

    Another thing: did you refresh those tubes? Does it really matter if you don't? Koch states that you need to buy Koch-tubes, but i don't really understand why?

  44. #43

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    Quote Originally Posted by Marcel_A View Post

    Whoever thought Startrooper was a good idea? It would be a name my son (ten years of age) would like, maybe.
    Anyway, Jupiter sounds more distinguished.
    Another thing: did you refresh those tubes? Does it really matter if you don't? Koch states that you need to buy Koch-tubes, but i don't really understand why?
    No need to buy Koch-branded tubes. Any decent-quality 12AX7 tubes will do. The 12AX7 in the preamp should be good for years. I don't know what the useful lifetime is of the 12AX7 in the ATR circuit. I would imagine if the amp is played relatively clean and at low volumes, both tubes will have long lives. Send them a note and ask.
    Last edited by Hammertone; 11-20-2020 at 05:06 PM.

  45. #44

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    Wow, this amp really delivers.
    The cool channel is has a nice balanced sound which can be spiced up with the contour switch in the 'up' position (more and heavier mids). I leave the tone controls pretty much at 12 o clock. The gain and master can be uses for a little grit, but since i use it at lower levels, this is not really happening for me. The sound is really good. Comparing it to an all tube amp and a decent ss amp, i would say halfway you come across the jupiter.
    The hot channel is brilliant. Gain pretty much on 12 o clock and it produces a nice overdriven sound that can be toned down to a more or less clean sound when i play soft en gentle. The contour switch spices things up instantly and the boost brings the sound more into Eddie van Halen territory. Especially when i switch to the bridge pu.
    And it is very easy to achieve these different tastes. It's really a matter of the two switches. When i flip the boost switch i bring down the master because of the neighbours, but that's really all it takes.
    The two switches, boost en contour on it are worth their weight in gold.
    But they are very little.
    Yes, but you know what i mean . . .