OTL Asylum

do you have enough tubes to make sure one is complete?

68.33.217.91

Penguin

A

In Reply to: RE: that is very odd posted by throwback on June 13, 2012 at 19:45:33

And see if that channel is OK? At least you would know the whole thing works. MAke sure the one complete amp works with both speakers. Then take the full complement of tubes and transfer it into the other amp and make sure it works. Once done you will know a few things :)

dee
;-D

True terror is to wake up one morning and discover that your high school class is running the country.

quote by Kurt Vonnegut

Follow Ups:

RE: do you have enough tubes to make sure one is complete? - throwback 20:01:05 06/13/12 (2)
I actually found (just) enough tubes to outfit both amps. I thought I was in fat city because the guy who sold them to me included a number of extra tubes, each lovingly wrapped in bubble plastic. Turns out, most of those extra tubes were defective.

I am going to proceed roughly the way you outlined. I am just curious how the OTL works. What If I had only two tubes. Would the output impedance be outta sight?
- RE: do you have enough tubes to make sure one is complete? - Lew 08:35:06 06/14/12 (1)
  For a circlotron output stage, output impedance, Zo = Rp/(2+mu), where Rp is the parallel sum of the plate resistances of the tubes on one phase of the output stage. So you can see that the more tubes in parallel, the lower will be Rp and the lower will be Z.
  - RE: do you have enough tubes to make sure one is complete? - throwback 14:52:48 06/14/12 (0)
    Lew
    I didn't know the formula, but I remembered the principle.
    Thanks,
    Chuck

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