Ampeg SVT Classic - Service Bulletins and Schematics

[Tone Meister]

Attached are 4 technical service bulletins and various schematics for the SVT Classic bass head from the SLM era. I can't say this is a complete archive.

[bob p]

thanks for posting the TSB. i have a pair of 2 Pro that might be covered by the TSB (an early one and a later one), so I'll be sure to check the serial numbers.

[Ted]

Here's another one

[Ted]

and another

[catstrat]

Thansk again everyone. I'm still missing the part of the schematic i need. The schematic that's for the driver board with the 12ax7 and the 2 12au7s. That's the one i need. The one that has the bias trim pots on it. Resistor r14 is in the pre amp and it's a grid bleed for v2, side A. 220 k. I assume thats the board in the pre ap chassis. On the driver board, as i call it, there is another R 14 and i don't have a clue what it's value is. It was so badly burned in the first place i couldn't read the code. Thanks

[soundguruman]

I don't think that CRATE ever gave us a complete schematic to this amp.
Yes, it's a CRATE amp. Says "Ampeg" on the outside, it's a CRATE on the inside.
Hence the name: "Crate-Peg."

I posted the PDF but I only see a black screen when I open it.
Do you see the schematic?
I will try sending it to your mailbox...

Nope would not work. I'll try later. Seems like something is not going thru on this end...
Well send me a mail to my mailbox, with your address, and I'll mail it to you.

ampegt SVT CL driver update.pdf
OK try that one, it might work better.

[g1]

See page 7 of the pdf attached, R14 (220R) is in the cathode circuit of V1 and appears to also connect to the spkr.out board.

[Jazz P Bass]

R14, if it attaches to R13, V1 cathode , pin 3, is 220 ohms.

It appears to be a voltage divider to the Spkr Out header.

Schematic link: Download Ampeg SVT CL.zip from Sendspace.com - send big files the easy way

Make sure that you click on "Click here to start download from Sendspace"

[Enzo]

From the very beginning, St. Louis Music provided COMPLETE schematics for these amps as well as parts lists and board layout pictures. We have posted them all before, and we shall post them all again.

[Jazz P Bass]

Ampeg SVT CL

Here is the schematic, in case that link goes away.