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Weird F5 bias issue
Weird F5 bias issue
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Old 25th June 2011, 03:37 AM   #21
JZatopa is offline JZatopa  United States
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Location: Chicago
So 0 offset > then bias V. OK sounds good to me.
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Old 25th March 2015, 03:36 PM   #22
Rewind is offline Rewind  Sweden
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Good thread. I got some similar problem with cviller v3.0 F-5 non-turbo boards. Might just replace the jfets with the recommended values. Now I tried 12.5 mA LS74 and 9.22mA 2sk170. I made a short on the channel that is acting up due to a bad DMM. Just a short flash, but might have been enough. I get 0.5V offset at 0.5V bias across the closest 0.47R 3W resistor. Input closed, speaker outputs open. The other channel has 0.23V with 0.6V bias.

Last edited by Rewind; 25th March 2015 at 03:40 PM.
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