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Old 9th Nov 2017, 8:17 pm   #3
Join Date: Feb 2004
Location: Hexham, Northumberland, UK.
Posts: 1,996
Default Re: BEME Mini Loop - silent

I would sub the DK91 with a known good one for a start. Then check the valve sockets for poor connections. I am not familiar with this set but suspect it may be a DF radio? Check all voltages around the DK91 also, but sometimes these valves just get tired and won't oscillate. If you have a means of checking if it is oscillating that would be good. The IF stages onwards seem to be working ok from what you have said, so maybe a poor connection around the frequency changer is the culprit. It's possible that the supply decoupler electrolytic (if it has one) has given up the ghost, and taken too much current which would cook the bias resistor as you describe. It may have recovered but maybe it got too much grief and failed. Try removing it and subbing it with another.

Last edited by Biggles; 9th Nov 2017 at 8:21 pm. Reason: More info.
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