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12-29-2023, 04:59 AM
Small update:
Checked the output transformer, the windings seem good. Primary side leads shows 25 and 30 ohms to the center tap, secondary side shows less than an ohm for each of the impedance settings.
Stopped by the electronics shop today and picked up the needed fuses, plus a PCB mount fuseholder that I'm going to install so that I don't need to pull the board in the future just to replace the fuse. While I was there I ran the quad of 6L6's from the amp through the sylvania #2500 tester, and they all came out as having "good merit" (~100 on the scale) and "no shorts". However, based on what I've been reading in Tomer's book Getting the Most Out of Vacuum Tubes, these readings likely don't count for much, particularly with regards to shorts. Observation of the tubes shows thin brown rings around the edge of the getters, and one of the tubes' plastic base has come unglued. Once I have the fuses installed I'll power up with my lightbulb limiter and variac, watch for funny stuff, and if that goes well pop the tubes in and keep an eye on things as I bring the amp up again. If it's /not/ the tubes... Hmmm...
Checked the output transformer, the windings seem good. Primary side leads shows 25 and 30 ohms to the center tap, secondary side shows less than an ohm for each of the impedance settings.
Stopped by the electronics shop today and picked up the needed fuses, plus a PCB mount fuseholder that I'm going to install so that I don't need to pull the board in the future just to replace the fuse. While I was there I ran the quad of 6L6's from the amp through the sylvania #2500 tester, and they all came out as having "good merit" (~100 on the scale) and "no shorts". However, based on what I've been reading in Tomer's book Getting the Most Out of Vacuum Tubes, these readings likely don't count for much, particularly with regards to shorts. Observation of the tubes shows thin brown rings around the edge of the getters, and one of the tubes' plastic base has come unglued. Once I have the fuses installed I'll power up with my lightbulb limiter and variac, watch for funny stuff, and if that goes well pop the tubes in and keep an eye on things as I bring the amp up again. If it's /not/ the tubes... Hmmm...
