I’m not clear on your question. Switch is A,B and C. Position A bypasses PAD. B and C are -15 and -20 respectively.

Can you tell more about the DC heater setup? Transformer specs?  Regulated? For regulated 6.3V you really need an 8-10V transformer.

6.3 x 1.414 = 8.9V leaving only 2.6V difference which a close margin for Regulators

I hate to be a dunce here, but I am going through my dual O86 and cleaning up my messes (lots of bad wiring on my part, I've learned better tools and slower approach makes better results)...

Anyway, I JUST found out I had my PSU resisted to ONLY be one channel and am fixing that...

But I still have two lingering questions...

My DC heater voltage is only giving me about 4 V, not the 6.3v as advertised...I might switch to AC heaters if I cannot sort the short...where should Iook to find the missing 2.3 volts since my AC coming out of the Tranx is 6.3? Or is 4 volts close enough?

Second...I originally had the pad switch jumpered and out of circuit, even though I populated it  and wired it up...as I go and re-do the DI board I notice "SW A and SW B" going to SW-1 on schematic...and like a dufas I do not remember where the respective "A and B" are on the actual switch BUT I do have to empty pads on it...I am assuming those are "A and B" but they are not labelled...anyone know offhand if I am correct and if so which is which?

One pad is in middle of switch (I assume A) one is on edge of switch (B?)


Sec

Right, finally had a bit of success with one pcb!
I’m getting good voltages and all pots work, even though they are 5k rather than 10k.
I’m going to try and connect these to the Neve 1290 and see how they sound.

And another price drop!!

Kind regards,

Willem

not sure if this helps..