Ampeg SVT-VR Bias control

[SimTech]

I have been working on an Ampeg SVT VR for a few weeks now and replaced the power tubes and all electrolytic caps and am waiting on the owner to buy new preamp/driver...

[stevenrb718]

I have an Ampeg SVT-350H that isn't outputting to the speaker jacks. It outputs through the power amp out jack, so the problem must be in the power...

[feickbrad@gmail.com]

Sorry guys-

looking to contact John Gemmel as recommended by David Sarge for an Ampeg repair.

I see no way to PM forum users. ...

[Queen*Son]

Well I took the amp out anticipating a new tm1 for the tremolo and I wanted to look at some of the mods that were done.. of the 3 1/4" jacks 1 is for...

[nanodocl]

I am trying to repair an Ampeg Ba115 HPT that blown output MOSFETS. When I change the MOSFETS approximately 2.5V DC appears in pin 7 of the operational U3...

[fuzzman72]

Hello

My Ampeg BA-110 started to produce a low pitched hum, not very loud, but annoying.
I've measured 450mV DC at the output without load...

[fuzzman72]

Hello

My Ampeg Preamp SVP-Pro started to distort heavily, so I opened it up I take some voltage measurement.
They are out especially...

[Sjaky223]

I bought this amp a while ago and for the biggest part it works perfectly but i recently found out that the built in limiter (which is turned on and off by...

[tbonuss]

Hi--anyone have a better scan of the Ampeg VT-60? There are some subtle "gotcha's" between the VT-120 and the VT-60--important ground scheme differences,...

[EWaffle]

I have a 1974 V4 head that shocks me every now and then, usually when touching my guitar strings and touching another person who is touching their strings,...

[RWood]

Hi folks,

I've got a G-212 solid state amp on the bench and have a problem with a volume-dependent hiss on Ch 2.

Here is the schematic...

[Tumshie]

This thing's pre-amp is so hot it really amplifies anything the bass pick-ups attract, noise wise. Sometimes, it buzzes like a hornet when an instrument is...

[blindboybenton]

Hello

Ive had a SVT-4-pro in which a cutting out on high treble notes ??????
Ive checked it over, Tested with Bass and on Dummy load and...

[bobs426]

Hi,

I am trying to repair an old reverberocket R12RB with a hum problem.

It has 7591 7591 6SL7 6SL7 6SN7 6SL7 tubes.
...

[vercingetorix]

I love this amp and it sounds fantastic, for about 3 minutes and then it dies (sound gets squashed to nothing, amp keeps running). If I flip the Standby on...

[Barnaby Jones]

Hello,
So I am attempting to repair an SVT-3 pro. I think the input jack was broken and just wanted to check it to see if the connection was intermittent....

[idlefaction]

Hi team

I've completed my SVT build, and it sounds amazing!!







I used the...

[jgiebler]

I have searched the forums quite a bit looking for the Schematic for the Line Out board for the Ampeg SVT3 Pro. All of the schematics I find are for the SVT...

[homeinmyhead]

Hello! I have a Ampeg SVT classic that has alot of issues.

First issue I have is the standby, when I let the amp warm up for 30 seconds it...

[kylekienitz]

I'm doing some work on an Ampeg VH-140C and trying to track down the correct tank for this amp. Anyone know what it is? I haven't been able to find anything...

[amarksupreme]

Hello - new member here. So my B- 100R is blowing fuses, and I have read that the output transformer may be bad. Is there an easy way to test it out? Or does...