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mroovka 9th March 2007 07:48 AM

Ampeg SVT-VR or SVT-CL Schematics
Hello everybody,
I'd like to build tube amplifier on my own and I had chosen Ampeg SVT, but have a problem with schematics:
On the Internet I can only find an old SVT schems ( -SVT preamp and SVT poweramp). that uses 12DW7, 12BH7, 12AX7 & 6C4 tubes in preamp and driver stage. This times it's very hard to find 12DW7 & 12BH7, even impossible in my country :/
Does anybody have the new schematics (with 2x12AX7+ 12AU7 in preamp and 12AX7 + 2x12AU7 in driver) or can just adjust the older schematics to use only 12AX7 & 12AU7 against DW7, BH7 and 6C4?

I'll be enjoyed with every help


Ragnar 31st March 2007 09:29 PM

try to look at these (skus si vybrat z tychto):
I don`t actualy know about any site with the up-to-date circuits of Ampeg, anyway SVT is the classic :cool: , I`m also building one wright now...
Anyway, our slovakian JJ electronic make them - ECC832 ;)
and the half of ECC82 is an equivalent to 6C4

teemuk 1st April 2007 08:47 AM

SLM electronics had the factory schematics of some "newer" Ampeg and Crate models on their website about a year ago but now they seem to be all gone. I guess those companies are now trying to make profit with selling them. Anyway, you should check - even back then the link to those files was pretty "hidden". I have the schematics for SVT-CL with 12AX7 preamp tubes but I'm not sure whether it's legal to share them.

The Ampeg website states:
"At this time Ampeg does not display schematics online. However, if you wish to obtain a physical copy of product schematics, please contact the LOUD Technologies Inc. Service Center at 1-800-898-3211."

stoN_Cold 1st April 2007 09:59 AM

All about tubes is OK, what about output transformer ?
Regards zeoN_Rider

mroovka 1st April 2007 02:39 PM

SVT-3 schematic
I've posted to Ampeg. They sent me requested schematics. Thanks for any answers.
BDW: It's good to know about ECC832 ;)

Ragnar 1st April 2007 05:15 PM

That`s great news. Would you mind sending them on my mail ?
I would appriciate the new models...

Ragnar 2nd April 2007 09:39 PM

or you can upload then for some time here, so I and the others interested in them could get them..
did you get the SVT CL ? that would be so cool :rolleyes:

basstard 30th July 2008 08:21 PM

sorry to resurrect such an old thread, did anybody ever finished the SVT?

I'd like to build the SVT preamp and then use it with a serious poweramp,,,

BTW I got some schem's if anybody is still interested,,, they're marked SLM Electronics so I guess they're original,,, still I didn't check for any error,,,

Ragnar 30th July 2008 09:35 PM

yes, I have completed SVT3 pro preamp and i really like the sound of it, I managed to acompany it with the Leach poweramp build for 220W and have a realy neat sound, powerful, but unfortunately I don`t have any serious bass box for it, just a bass speaker, but It sound great anyway.

basstard 31st July 2008 07:05 AM

beautiful,,, do you have a schematic for your build mate?

I got the SLM ones but they're a bit too complicated for my being thick,,, :D

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