Ampeg SVT-II Preamp schematic

[Baabi74]

Hi there to each and every one.

Working on a clone of a Ampeg SVT-II Pro preamp.
However, the Ultra-Hi and Ultra-Lo switches doesn't seem to work as they are supposed to...

Can anyone help me out here? Take a look at the schematic and tell me what you think about the Ultra-Hi / Ultra-Lo section. Is there something "funky" going on?

Cheers,

"Bobby"

 

[JonSnell Electronic]

Strange, totally different to the SVT-II so not a 'clone' at all.
Theoretically it will work a bit but nothing like the original, that is still copyright.

 

[Baabi74]

Ok, so what does a original SVT-II schematic look like?

Here's the original schematic.

 

[Enzo]

First, do you have an SVT2 or an SVT2PRO? You have mentioned both models.


How do you expect them to function, and specifically how are they functioning for you now?

 

[JonSnell Electronic]

That is not original. The original is printed by SCM Electronics and the drawing number is 07P319 dated March 1993. Not MOZ Electronics.
V1B section is the first stage, there is no cathode follower and V1A is the second stage.

 

[Baabi74]

Build finished

Hi guys (and gals)

Sorry, totally forgot to "catch up" on this thread since I found the problem. It was just a few cables between the tubes and the circuit board that were soldered to the wrong place. Now everything works just fine.

Interested how it turned out? Check it out here; The Black Box

Cheers,

"Bobby"