Cary SLM-100 Bias in Triod Mode


Does anyone own a pair of these amps? The manual states a bias of 175ma but I believe this is for the default UL mode. Which, I think, would explain by I keep blowing the tube fuse despite my tubes testing as "good." Wish I could bias each tube individually. Also, another symptom, related or not I don't know, is that sometimes the bias doesn't stabilize for about 10 minutes. It just keeps creeping up. Does anyone know what might cause this?
pawlowski6132

Showing 1 response by px25

Pawlowski, is the problem with one amp or both mono-blocks? If you are only blowing fuses in one amp, then swap all of the tubes from one amp into the other and see what happens. If the fuse blows on the amp that had previously not been blowing fuses, then you have a problem with the tubes. If the original amp, with the swapped tubes, continues to blow fuses, you may have a problem with the power supply. Another way to check tubes verses power supply is to disconnect each amp from any load (disconnect the speaker cables,interconnects, but of course plug the amps into the wall), remove all of the tubes, and turn the amps on. If they blow the AC fuses, you have a problem with the power supply. If they do not, you have a problem with the tubes. Check with Dennis at Cary before doing this, but I believe you are ok operating the amps with no load. Hope all turns out well.................