Thanks to all for the replies; but I now have more info. (see quote below) on this piece that sounds very important, but is way over my tech-challenged head!
AFAIC, all of this may as well been written in Martian!
"I realized today when I got the cover off that this was the 222C I put Hovland Musicaps in as coupling caps. Also, the more important caps in the phono and preamp circuit were replaced with Sprague 716p "Orange Drop" capacitors. I mention this because I think I said this one had Russian PIO's in it. That was another one I did, I just got confused. Anyway, if you really wanted the PIO's I have a huge stash of them and can quickly swap them out. The Hovlands are more expensive caps but that of course does not mean they are better. Also, I added some fast recovery soft switching diodes to the leads of the bridge filament rectifier for two purposes. One, it make the bridge as quiet as the fast recovery diodes (I don't think it is too important on the filaments though). Two, it provides about 0.7v of drop out of the rectifier which in conjunction with a 10R resistor, brings the voltage back down to the 6.3v range. The silicon rectifier is more efficient than the old selenium one and raises the voltage too high without the resistor and diode. Just FYI and for future purchases, if you ever buy an older amp (circa late 50's and early 60's) that has been "refurbished, freshened up, or updated" be sure to ask or check and see if the filament voltages are correct, this is a often overlooked modification mistake that can get really expensive when your expensive NOS tubes start to burn out."
Huh?
I am sooooooooo confused!
Comments?
Thanks!
SN
