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D3a vs 417A

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Posted on March 17, 2017 at 07:07:23
Tube_Maniac
Audiophile

Posts: 8
Joined: March 9, 2017



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.







 

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RE: D3a vs 417A, posted on March 17, 2017 at 14:06:10
hifipaul
Audiophile

Posts: 735
Location: NY
Joined: December 22, 2008
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.

 

RE: D3a vs 417A, posted on March 18, 2017 at 05:33:13
Tube_Maniac
Audiophile

Posts: 8
Joined: March 9, 2017



What about this one??

 

RE: D3a vs 417A, posted on March 21, 2017 at 04:00:02
Tube_Maniac
Audiophile

Posts: 8
Joined: March 9, 2017
 I forgot to mention the plate load resistor would be 10K. Any thoughts??

 

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