A detail that could help other builders :
I had to deal with a hard to adjust channel. It crackled sometimes, with blinking LEDs.
I was quite desperate, and started to read the batteries adjustment techniques again.
First method was Inu's, 10k at the middle and 2k full to R32 side, not good.
Then, I tried to adjust without using 2k, no crackling noise, but some random "whistles".
KG's silkscreen patern, all trimpots centered, not good either.
Finally Kerry's way cured the thing : 6.55V at 22k resistor using 10k pots while keeping 2k centered, then fine tune with 2k.
So keep in mind that each build and each channel is unique. Be creative, walk sideways.
Now the sound is scandalous, like I said...
PS : 95 % Takman even in the batteries, not even raised above the PCB
750 Ohm at k216 gates
2*5pF compensation caps
Matched 3675 at parallel spots
Balanced and noiseless Sylvania "Green Hornets" 6922