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G6Tanuki · 3rd Jan 2019, 6:46 pm

The top triode is being used as a sort-of constant-current 'load' for the bottom triode in place of the usual anode-resistor.

3rd Jan 2019, 6:46 pm	#7
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,010	Re: Puzzling audio circuitry The top triode is being used as a sort-of constant-current 'load' for the bottom triode in place of the usual anode-resistor.