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Aikido with D3a??

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Posted on March 9, 2017 at 03:31:47
Tube_Maniac
Audiophile

Posts: 8
Joined: March 9, 2017
Hi all!
Can I use D3a (wired in triode) for all positions of Aikido?? What is the suggested B+ voltage?

Thanks!

 

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RE: Aikido with D3a??, posted on March 9, 2017 at 08:46:19
Chip647
Audiophile

Posts: 1658
Location: The South
Joined: December 24, 2012
There is only one tube section in each D3a, all the Aikido boards use twin triodes. If you are trying to undertake a point to point build of a n Aikido with 8 tubes, all I would advise is that there are easier ways to create a buffered attenuator.

 

RE: Aikido with D3a??, posted on March 9, 2017 at 22:33:50
Tube_Maniac
Audiophile

Posts: 8
Joined: March 9, 2017
What is the B+ voltage you guess for Aikido with D3a in triode?

 

RE: Aikido with D3a??, posted on March 10, 2017 at 19:50:33
Chip647
Audiophile

Posts: 1658
Location: The South
Joined: December 24, 2012

That tube has an amplification factor of 77. How much gain are you needing?

150V on the plate and 20mA would not be a bad point. 8 tubes at 20mA will cause you to have a very stout +200mA B+ supply. a 320v B+ would work.

Use the recommended cathode resistor of 470 to generate the 10 v of bias for around 20mA at 150-160 volts across each tube

 

RE: Aikido with D3a??, posted on March 12, 2017 at 05:50:07
Tube_Maniac
Audiophile

Posts: 8
Joined: March 9, 2017



WOW!! 200mA! What a current?

Refer to 5687 Aikido, it has several different B+ voltage for Aikido with 5687> What are their differences? Which one do you prefer?

 

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