Re: Ferrograph 4A: Restoration advice needed
Herewith Stuart tape circuits articles, and also the specs of the Bogen heads for which it was designed (as given by HW Hellyer in Tape Recorder magazine). Stuart also gives circuit for a discrete-component version towards end of articles - just three BC108s and some passive components! I think the specified RCA 3048s might be difficult/impossible to source now. But any high quality, low-noise op-amps will do just as well. So simple, it might be worth just breadboarding and trying.
Out of interest, I found out by accident that this circuit also makes a rather good pre-amplifier for a magnetic cartridge...
Mike
[EDIT - sorry Graham, I hadn't seen your post when I posted this.]
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