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D3a vs 417A

What if this circuit replacing with D3a (wired in triode), I know the output impedance should be high without any buffer stage and line output transformer. What is the output impedance can you think of?

Should we adopt the 110 ohm cathode resistor value from Andrea Ciuffoli headphone amplifier design?


What is the plate load resistor?? The B+ is 180v.

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Topic - D3a vs 417A - Tube_Maniac 07:07:23 03/17/17 (3)


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