Re: Motorboating
Failing all else, you could try fitting grid 'stopper' resistors in series with the control grids - about 1k in value might help. I also feel that, contrary to other posts on this topic, you could try dispensing with the cathode bypass electrolytic completely as this would provide negative feedback and so should help stability - at the cost of some output power.
In the past I too have had problems with instability with projects using the ECL80 and I put these down to the common cathode.
Good luck!
-Tony
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