Bias Potentiometer Issue

Tubes Asylum

Questions about tubes and gear that glows. FAQ

Wondering if anyone in this forum can offer guidance on a minor issue with my Unison Research S6 tube integrated amplifier. This amp has six buttons to adjust the bias - one for each EL34 power tube. There is one "bias meter" per channel and each meter has three buttons associated with it - one for each EL34 tube (six in total).

The issue is that the meter does not react when pressing the top left bias adjuster button. There are no issues with the other buttons. I have tried switching the afftected tube with a different functional EL34 tube but I'm still not getting a meter response - ie - meter needle does not react.

I may be wrong but in my newbie opinion, the tube and its power output do not seem to be affected. The tube glows as usual and there is no audible difference.

Anyone have any ideas of what can be wrong? Anyone believe this is serious enough for me to stop turning on the amp until it's fixed?

Thanks in advance for any response and guidance.
Tony
Tony
Montreal

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Topic - Bias Potentiometer Issue - tonysco 10:20:23 01/23/23 (3)

probably just an issue with the button switch - Chip647 13:52:54 01/23/23 (2)

RE: probably just an issue with the button switch - tonysco 16:41:35 01/23/23 (1)

You are probably very safe (nt) - Chip647 06:17:50 01/25/23 (0)

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