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Hello!
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?
http://www.audiodesignguide.com/NewHeadphoneAmp/sch1.gif
What is the plate load resistor?? The B+ is 180v.
Follow Ups:
The D3a is a great tube. If you want to build with it, great, but use a circuit designed for it. The above circuit is for a 417.
I forgot to mention the plate load resistor would be 10K. Any thoughts??
What about this one??
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