Took the schematic from a well known PSE807 amp, and swapped to 7027a's vs the 807's, though later I will test the 807's in it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Got the transformer installed today, NOS Tektronix Unit, out of a Massive 4 module Oscilloscope, Overkill for 2 PSE 7027a mono blocks, But I really dig the end bell!
Had to show off the NOS clear top, side getter 12au7a
Forgive the atrocious image quality (or lack there of) it's the best my blackberry can muster.
Had to show off the NOS clear top, side getter 12au7a
Forgive the atrocious image quality (or lack there of) it's the best my blackberry can muster.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Strange, cant get music to play, and when the tubes running on B+, my bias voltage drops to -5v, vs the -15.4 I set when the B+ is off.
Figured out the bias issue, bad resistor!
Got nearly all the hum out of the system, but now I have a problem with the sound coming out with no high frequency tones, it sounds slightly distorted, and kinda muddy, Suggestions?
Got nearly all the hum out of the system, but now I have a problem with the sound coming out with no high frequency tones, it sounds slightly distorted, and kinda muddy, Suggestions?
Set bias to -30v, clarity returned, and now it runs great! I omitted R6, swapped the potentiometer value to 50k.
Amp runs like a champ! Ill post the modified schematic later, for now, enjoy the pics!
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
- Status
- Not open for further replies.