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Ableton Link Enabled Keyboards Instruments.Also, check any caps installed across the bias network. Now, if it's only one channel, that's a strong clue that something is slightly amiss, if not a thermal connection, than possibly a device starting to go bad. I'd guess more amps have been destroyed by intermittent bias pots than any other circuit-related failure, though not as many as teenagers or shorted speaker cables. IMO, fixed resistors are way preferable to bias pots as they're unlikely to be mis-adjusted by tyros and will likely never fail like a pot will. Naturally all connections and any trimpots need to be in good shape or bad things will happen. It's a feedback system and like any feedback system, any delays will cause instability. Sensing the heat sink is second best at best. The best schemes have very tight thermal coupling, often directly to an output device package. It's not uncommon to see a continuous wander up and down by sometimes surprising amounts. IMO, much wandering of the bias current is the result of thermal lags between whatever devices are controlling the bias, and the heat source. Look for thermally linked transistors further back in the circuit. Some designs (properly) put the thermal compensation on a driver transistor, not the output or heat sinks. If you have a link to the schematic I can check it, but I didn't find it in the usual sites.Įdited: attached is a Bias graph from the Crown DC-300 service manual, to illustrate the bias tolerance. Try monitoring the bias with the cover on, so the cabinet is closed, perhaps the temperature keeps within a smaller range. When attached to the heatsink, this closed circuit reach an equilibrium after some minutes, and stay at +- a certain value. When they cool down, the bias transistor or diode conduct less and increase the bias voltage. Bias circuits usually work tracking the temperature, the hotter the amp, some diode or transistor gets hotter, so it conducts more, and it lowers the bias voltage to the output transistors. Click to expand.So, perhaps this is a normal behavior, if the thermal tracking circuit is not attached to the heatsink (what is possible, I've seen that many times), just diodes or transistors "close" to the heatsinks, perhaps it's just the time it takes to react to temperature changes.