ampman1961
Responses from ampman1961
| Audio Research CL-30 Bias Drift BifwynneMy name is Billy Yates and I live in Venice Ca.My client found me through several registries regarding amplifier repair. I fixed the amplifier, and is now back in service. Apparently, there are very few resources in Los Angeles to repair t... | |
| Audio Research CL-30 Bias Drift Replacement of the optical isolators (LDR) made a difference. The bias has stabilized but is uneven at each pair. The difference averages out to be around 1.4 volts. I can live with that after I pair up the tubes where the current is best divided ... | |
| Audio Research CL-30 Bias Drift I agree. I just stated that as a measure of test procedure. In a common PP amplifier, the bias voltage can be affected by leaky coupling caps. I see this fairly often in guitar amplifiers. I will check the DC cathode circuit as you suggested.Thanks. | |
| Audio Research CL-30 Bias Drift Here's the test condition:No tubes installed, power on and warmed up for a minute.The bias rail before the grid circuits measures -53 volts and maintains that value. However, from left to right as viewed from the top rear, of the 4 6550 tube socke... |