Thanks PRR, I'll be tinkering with this for a while to say the least. I should say that for just coming up with this and not even prototyping one yourself you did a fine job, and I appreciate your work!
as for leaving one pin on the trafo undone, I just did it for the sake of it, I didn't expect anything and got just that.
I'm not sure what you mean by take the tranny off the PCB..
Do you mean that the shell of the trafo is internally attached to one of the pins on the trafo? this wouldn't happen to be the one with the white dot next to it would it? I didn't bother to ohm the shell to any pins because I didn't figure the shell would be attached.. I see that the the two output trafos have one output to ground.. do you mean to take those up and set them up for balanced output?
what gets me is why grounding the -input causes so much noise to infiltrate.. I would guess it's a dirty ground and the noise is then becoming part of the signal when attached to the trafo?
as for the two opamp setup, that is one of the ways I was thinking of doing it. I will probably do just that, however I was wondering if just adding another board would do the trick so that I can continue using this board.. lazyness i suppose.. :green: If not I'll layout another.
I already put the regulated supply in and as you say it doesn't do much, good or bad. this was just tinkering to see what would happen.
the heater wiring is straight from the PS to the board, less than 8 inches of 16ga wire.
as for the mixed grounds on the skinny trace, I would think adding a large solid cored ground along this ground trace would help, no?
I thought that -65 to -70 was good, but I'll try to hit -80db, maybe i should layout another board? I guess i thought tubes would just be noisier.. :green:
thanks again PRR!
