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Old 13th Mar 2019, 7:10 pm   #48
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: Ferrograph 4A: Restoration advice needed

Anode to g1 short in the valve? otherwise you have a lot of oscillator power going on because the only power reaching R35 should be erase frequency AC via the secondary of the oscillator coil... or has the thermistor gone low?

This circuit should survive without the heads, otherwise removing the erase/bias link will do damage.

David
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