Jailtime
Standin' on a corner
I have a "restored" 500C here that I fired up for the first time today. I didn't do the work on it. It has the basic restoration, silicon rectifier, coupling caps, and fuse resistors. Still has original can caps. I ran it on my variac so I could control line voltage, my line is a bit high (124V).
I measured 465V on pin 3 of the 7591s (should be 430) and 410 on pin 8 (should be 375). The resistor after the rectifier is the original value. Possible cause for the high voltage there? The right channel has distortion in low frequencies. There's also a whistle in the right channel, doesn't matter what input or volume setting. All the tubes were tested with Maxi Matcher testers. I'm not very happy with this performance from a unit that was "restored".
I measured 465V on pin 3 of the 7591s (should be 430) and 410 on pin 8 (should be 375). The resistor after the rectifier is the original value. Possible cause for the high voltage there? The right channel has distortion in low frequencies. There's also a whistle in the right channel, doesn't matter what input or volume setting. All the tubes were tested with Maxi Matcher testers. I'm not very happy with this performance from a unit that was "restored".