This is a question for Roy, but I thought to post it here since it might be interesting and/or helpfull to everyone.
I ordered Roy's SP-14 preamp, and there is a second pair of coupling caps that can be add to the circuit.
I already own a pair of .22mF Russian military surplus K40Y PIO capacitors. Can I use them in that circuit instead of the .33mF normaly used?
I suppose I could try them and see (ear rather), but before, I'd like to know if there is any danger to the circuit itself.
They're huge though, its the 1000 volts version.