Re: Ferrograph S3 and S4 help with some issues please
Ps: I have so far checked the caps on the power supply/oscillator unit and all seem to be fine. The bias adjustment pot was totally jammed at half way and have freed it up but the only way I can get a full deep erase is to turn the bias adjustment fully clockwise which of course affects frequency response! Arghh! I swapped both the EL84 and EZ80 just as a curiosity (although they had passed the test already) but the result remained the same. It’s a low output from the oscillator perhaps? How can it be measured please and what should I expect to measure voltage wise?
Thanks again
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