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RE: 4P1L preamp DIY

Not much gain in there but very nice :) The issue with the PCB is that you are tied into someone elses design with not a lot of leeway for mods. There are advantages to the PCB as hanging unsupported components and wires from a chassis-mount 4P1L socket can accentuate the microphony that is inherent with this tube . A PCB mount loctal socket does help , even better if it's mounted on a heavy brass subchassis :)

I can see you have Coleman regs in there . A good way of squeezing out the maximum is to use a choke input filament supply with a separate filament transformer for each channel . Hardly anything in it measurement wise (a few tens of uV ripple/noise) but to me , it does sound better

Also look for some Chinese 4P1S . In some applications , these sound even better than the Russian 4P1L


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