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Questions about tubes and gear that glows. FAQ

RE: GE 6L6GC Heat Issue

Good, but the test needs to measure the current. Tube testers mostly measure voltage output not current consumption.
About your intermittent load. Most amps made now, have circuitry to prevent or reduce oscillation. But, some amps were made without it, so not knowing your amp it is hard to say. A subsonic or high frequency oscillation in the particular channel could make the power tubes work harder and those would be running "hotter".


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