Tube DIY Asylum

Do any modern amps have a ballanced primary opt?

76.167.206.42

violinist3

So as to be designed for zero crossover.

Edits: 01/31/24

Follow Ups:

That's really not a problem! - Ralph 09:54:48 02/02/24 (3)
To keep an amplifier to having a good zero crossing, the output tubes have to be properly biased.

The problem you have in the output transformer is the center tap is never actually centered. One solution is the Circlotron amplifier, where there is no need for the OPT to have a center tap. That's when you find out that the tube match dominates any error in the center tap!

So this really isn't a problem to worry about in any competent design.
- RE: That's really not a problem! - Best audiotransformers 09:42:47 02/03/24 (1)
  Such output transformers probably already exist (maybe Tango, maybe even Lundahl) but can certainly be made.
  Two separate primary windings with exactly the same resistance ac&dc. Secondary balancing is also possible.
  - +1 nt - Ralph 15:06:00 02/05/24 (0)
    =
- RE: That's really not a problem! - violinist3 19:03:09 02/02/24 (0)
  My partridge p3591a has separate primaries.
RE: Do any modern amps have a ballanced primary opt? - violinist3 14:33:00 01/31/24 (2)
So as to have perfect cross over primary?
- RE: Do any modern amps have a ballanced primary opt? - 6bq5 19:10:28 02/01/24 (1)
  I am not quite sure what you are referring to when you say: 'perfect cross over primary'
  
  can you elaborate?
  
  Happy Listening
  - RE: Do any modern amps have a ballanced primary opt? - violinist3 06:07:00 02/02/24 (0)
    If you are using an opt with exact resistance/ wire length on both sides of the primary, Then you can with pots, adjust the ac level to match one side to the other so there is no noticable difference on a scope.
    That would be close enough I would think.

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