Bias adjustment in Eico 20 mono amplifiers

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My friend who has an Eico 20 mono amplifiers is wondering how bias is adjusted in his Eico 20 mono amplifiers. Is it auto- or manually biased? Should he readjust the bias when he changes the 5U4G rectifiers?

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Topic - Bias adjustment in Eico 20 mono amplifiers - tubers 01:48:01 05/1/10 (1)

Cathode bias... no adjustments. - Mossback 14:38:24 05/1/10 (0)

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