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Old 7th November 2011, 12:42 AM   #1
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Default Aikido line amp

Hello all,

I'm building an Aikido line amp using 6922's in the 150 volt "low voltage" version. After looking through the book and all the available material I'm still not sure about part values. I've emailed John and he never seems to respond. So if there is someone that has built this amp I would appreciate some help. The brochure that comes with the board is not really clear about values. And in fact some of the numbering of the resistors is inconsistent.

On the page titled INTRODUCTION TO THE AIKIDO. There is a schematic for the heart of the circuit. Below is a list of the best guesses I can come up with for the values:

R1&11 or Rg 1meg
R2&5 or Rgs 300ohm
R3&4 or Rk 470ohm (first stage)
R6&7 or Rk 180ohm (Second stage)

These as numbered in the drawing not by position.
R1 87.5k
R2 100k

Any help would be much appreciated, Kevin
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Old 7th November 2011, 02:52 AM   #2
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Hello,
Seems to me that a B+ of 150 is above the range of the “standard” way of thinking of the LV Aikido.
See page 13 of the straight up Aikido User Manual. There are part values for using 6DJ8’s at B+ = 150.
http://www.tubecad.com/Product_PDFs/...ereo_Rev_C.pdf
DT
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Old 11th December 2011, 06:44 AM   #3
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Hey DualTriode,
I'm building the Aikido section of the amp and have downloaded Tubecad's PDF. Once again there is disagreement between two Aikido schematics. The booklet that came with my Aikido all in one nine pin line amp board doesn't show a line amp schematic. It only shows the general Aikido schematic and the headphone amp. Tube cads PDF shows more components beyond the second tube. the PDF shows two coupling caps, C1 and C2 and specs Paper in oil or film. Can I assume that if I only want to use one, say film, the second can be omitted?

Kevin
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Old 11th December 2011, 07:23 PM   #4
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The above post was a waste of breath, please disregard.
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Old 29th December 2011, 02:50 AM   #5
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DualTriode,
Just wanted to clarify something. On page 12 of the revision c booklet it lists 124 ohm for the cathode resistors for 6922's at a B+ of 150 volts. That is resistors 2,4,8 and 11. Is that correct?
Kevin
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Old 29th December 2011, 03:52 AM   #6
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Kevin,
I will print out the pages and read. I will be back in the A.M.
DT

Kevin,

Not morning yet. I am back. Yes that is Rk or resistors 2,4,8 and 11 as you say on page 12.

DT

Last edited by DualTriode; 29th December 2011 at 04:00 AM. Reason: oops
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