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julie_m · 26th Feb 2017, 12:21 am

The common cathode of the ECL80 is not such a problem in a battery-powered set. You can tie the cathode to the positive terminal of the battery; and then you have a negative supply from which you can derive independent bias voltages for the triode and pentode grids. You also waste less of your hard-won HT.

(That's how I did it, anyway, when I built a battery-powered ECL80 amplifier -- and I can't believe I invented it .....)

26th Feb 2017, 12:21 am	#8
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: The Mullard EL42 The common cathode of the ECL80 is not such a problem in a battery-powered set. You can tie the cathode to the positive terminal of the battery; and then you have a negative supply from which you can derive independent bias voltages for the triode and pentode grids. You also waste less of your hard-won HT. (That's how I did it, anyway, when I built a battery-powered ECL80 amplifier -- and I can't believe I invented it .....) __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.