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PJL · 5th Sep 2019, 7:31 pm

The GP42 says the cathode resistor is 220 which seems low before making allowances for mains voltage/component tolerances. Push-Pull ECL86 will deliver enough power to propel the speaker cone across the room so I would reduce the quiescent anode current.

5th Sep 2019, 7:31 pm	#6
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: ECL86 issues The GP42 says the cathode resistor is 220 which seems low before making allowances for mains voltage/component tolerances. Push-Pull ECL86 will deliver enough power to propel the speaker cone across the room so I would reduce the quiescent anode current.