8 Channel, 3U NEVE 1073 completed

[ruffrecords]

You should not measure between the outputs and ground. The 1290 has a transformer output so it is floating with respect to ground. Measure the signal between pins 2 and 3 of the XLR.

Cheers

Ian

 

[Whoops]

The unit works fine and sound great until I set the gain to the last two positions (70 and 75 dB). Here the noise become unacceptable, I measured the output (+ to gnd) with the scope and found out that I got 23V on 70dB setting and almost 50V on 75dB setting.

like kidb said,
let us know specifically where are you measuring, is it the output of the PCB or the output from the transformer secondaries?
The 23V and 50V are AC or DC?
You don't need to use the scope just use a DMM for the voltage measurements

the transistor voltages are close enough to the tab on the assembly guide.

Show us your voltage chart anyway

You have a lot of worked involved in your build, quite a challenge, it's clear that you were really dedicated to that build. Specially the wiring for the gain switch, it's massive.
To be honest I would get pcb mount 2 switches and try at least in 1 channel with the proper switch soldered to the pcb instead of the wiring.
Did you talk with Colin from Audio Maintenance to see if he could get the switches?
If I remember correctly when I did this project I bought the switches from him