Thread: Grundig TK120
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Old 13th Oct 2019, 11:36 am   #3
Welsh Anorak
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Join Date: Apr 2005
Location: North Wales, UK.
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Default Re: Grundig TK120

I've had this fault which was due to a resistor (I think 150k) in the biasing of the first valve stage. Easily found with a meter, but obviously that depends on your level of experience with valved electronics - there are a few volts lurking around! Andrew's advice is of course valid, as would be a check on the output valve itself - and the speaker. I've not had any trouble with the power supply electrolytics, but it's possible.
If the 'magic eye' jumps about when you press the record button then I suspect your microphone might be faulty. Turn the volume up, then insert the plug while watching the display. If it moves, then I'd suspect the microphone itself.
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