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I rebuild my amp after analyzing the circuit. Than I noticed a loud buzz in the reverb, and the reverb sounded thin.
I switched the 2 rca plugs on the reverb tank, and the problem was solved. No more buzz, and a good sounding reverb.
Also, I found out this amp (rev e) is made in korea (not china), and has the right parts in it.
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12-05-2013 05:55 PM
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EVOSTARS - did your GVT suffer from the FX loop hum ?
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I tested it with a clean sho. No hum. There was a slight pop when switching. But very minimal, its in the design of the pedal (SHO). It gets amplified by the make up gain.
Originally Posted by newsense
The fx loop needs this gain, because it's inserted after the eq's. The gain there in the amp is pretty high for an fx pedal, so its first lowered before the fx send, and than after the fx return, the gain has to make up...
A lot of pedals have a slight switching pop, that gets amplified.
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Evostars, it's great to have some info on this amp. Thanks for coming in on this thread! And I hope you get something out of this forum to help with your musical journey. Originally Posted by EVOSTARS
The GVT is a great clean sounding platform for pedals, it is just a shame that some of the first consignments have a design fault on the FX loop.
A message to everyone on this thread, stick with this amp, it really is great.
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Happy to help Jazzbow.
I must say , its indeed a good clean amp. Lovely.
The fix for the fx is pretty easy, although its some work to get the print out.
I hope it helps.
I tried to over drive the amp with the sho booster. Now im not shure if the pedal distorted, but I didnt really like the distortion of the amp. Not so smooth. ,
EDIT: I tried again with normal volumes. It sound great with a booster pedal in front of it. Indeed smooth! Dont know what went wrong yesterday, but it was night, and I played with very low volumes...
Im going to modify the amp a bit. Increase gain, and change the mid eq boost.
For those interested in the tech:
http://www.newtone-online.nl/forum/i...;topicseen#new
But its in Dutch... feel free to ask...Last edited by EVOSTARS; 12-06-2013 at 09:43 AM. Reason: tested again
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Oh yeah. ...
I read this was a class A amp. This is not a class A amp... its class AB.
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My GVT 15H has just returned from its winter holiday in Germany. It went back to Thomann around the 15th December and has just come back. It has apparently been to an Ampeg service centre, but I am sorry to say it is in the same state in which it left me. It still has a very noisy FX loop. Although I sent full written details of the problem when I returned it to Thomann, I have received no explanation when the amp was returned. I am now trying to decide whether to just send it back for a refund, or invalidate my warranty by trying the fix described by EVOSTARS above.
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Newsense, I'm really sorry for your experience. I find the combo is what I want from a valve amp, it just really pisses me off you have a dud and are not getting the full enjoyment.
If it were me I would complain to the USA company, explain your predicament, etc.
Of course the simplest course of action would be to drop it and buy one of those Fender Vaporisers instead, that has a clean channel with a gain boost pedal.
Just a quick thought, did you check the ratamp link I put in earlier? The guy is now modding the GVT 5.
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Agree. Very sorry to hear as I love my gvt 15.
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Does anyone else notice a big difference in the EQ between the Full and Half power settings. I can only get a good jazz sound on half power, with the mids set at around 9.00 o'clock a la Jazzbow's advice), but on full power (which isn't a lot louder) the straight up sound is a lot thinner, and I have to raise the mods to around 3 o'clock and reduce the treble to get anywhere near a good tone. The half power setting is far fatter in my opinion. Is this what others find, or is this another fault on my model ?
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To be honest I haven't really played on the half-power setting much since I got it. I usually leave mid and treble at 12 o' clock and reduce bass to around 9 o'clock. I also roll back volume and tone a little bit on my AFJ95 to get my preferred jazz sound on full power. I'll try and see where I land with the half power as soon as I get the chance. Originally Posted by newsense
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I do notice a difference but that's just the physics of it. The whole circuit is going to be affected by the power running through it. I get a darker fatter sound at 5w but the tubes are only being pushed at minimum amount while at 15w they are being pushed with more power which is going to affect the whole output. I like it just fine at 15 but is agree that the 5w sweeting has a nice fatness to it.
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I related the full story to Tech Support at Ampeg - they confirmed that it was a known fault for which they had published a technical note - so Thomann are definitely at fault here. They also said they would send me the repair details and a schematic if I signed a disclaimer. I may go this route as it seems the easiest if it only involves two caps. Originally Posted by jazzbow
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Having slept on it, the GVT is going back to Thomann today for a refund. There is an Egnater Tweaker in a local store that is begging for me to try it !
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Remember the Koch Studiotone? I haven't looked back. No more GAS.
(Don't be prejudiced about the EL84s; the cleans really don't sound "English" to me).
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Did a quick test. The difference to me between full power and half power is subtle. I find the highs to be more pronounced on full power and the same volume, gain and eq. If I tune in a good sound with the guitars tone control on max with half-power, I can get just about the same sound on full power just by rolling back the tone a bit. Originally Posted by krueger
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I would have gone the tweaker route but it was out of my price range. The other one they had, the one where you can select the different power valves (memory fails me as to the name). They were great but had all sold out when I had the readdies..... Originally Posted by newsense
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Just a quickie.
Half power with gain set at 3 o'clock with volume at 12 o'clock and the tone control and wizard switching on me Tele really shines!
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anyone familiar with Ampeg Head GVT15? Does have good sounds for jazz, such as fat warm tone?
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Yes it does. It doesn't do overdrive particularly well unless you have a boost or O/Drive pedal to drive the preamp or max the gain and mids. It does clean very well, great for pedals and the tone stack boosts and cuts frequencies. IMO a good thing. Originally Posted by edh
If you have followed this thread there seems to be an inherent fault with the FX loop which is fixable. As you are you are in the US then you'll have better access to Ampeg techs who can correct this, it's just that us Europeans have have a raw deal due to the importer having no comprehension/desire to address this (2 capacitor fix).
Head versions are less likely to develop weird rattles as they can be isolated from cabinet vibrating speakers
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