HELP with tube position in B52 ST6012

[C1-ocaster]

I posted another thread about new SED winged-C power tubes that I installed in my B52 ST6012 amp, but I really need some help with the pre tubes positions.

I've searched on the interwebs but I can't find any information about pre tube placement/chart for this amp.
Does anyone know the tube positions for this amp, or know where I can find that info?
B52 no longer makes their line of tube amps, and the website yields no response from my multiple emails for help.

With some experimenting I've found the V1, V2, and reverb positions.
But I can't quite determine the phase inverter position.
There are 6 pre tubes. There is one for the reverb and I believe 1 for the effects loop.
Is there another tube for the loop return?

I installed just the V1 and V2 and then tried 1 position at a time for the other 4.
That resulted in no sound. There has to be 2 tubes installed in the 4 open slots for any sound.
That's why I can't find the phase inverter position.

Help please.

 

[charveldan]

This is the AT-100, havent seen urs before.

From left to right Pre's are V-1, V-2, V-3, V-4, V-10[reverb], V-11[loop buffer], V-5 [PI].

Power Section left to right is V-6, V-8, V-7, V-9, V-12-rectifier

I always ran 5751's in V-3 & V-4, took out some of the buzziness and gain.

I got rid of this amp 5 years ago after getting it from a friend.

Bottomline it was ok but took a ton and rack gear, EQ & effects just to sound average.

Jet City amps are better MIC alternatives IMO.

B-52 have issues andare not worth putting any money into, i learned the hard way.

If you have the combo ur chassis is upside down so eveything is backwards.

These amps including this one ran so hot you could cook ur meals off them.