SET Asylum

RE: Agreed.... (nt)

67.189.189.121

In Reply to: RE: Agreed.... (nt) posted by andy evans on February 28, 2008 at 15:24:46

I am not aware of any off the shelf parts that are designed to do this. If you have an OT with access to the needed wires you could give it a shot, but chances are you would be messing with a number of other parameters.

Assume a 5K 80ma trannie that has two identical primary wires in series to make your 5K value then separate the wires to feed the plate of each 300B. The 160ma of current from the two 300B's through 1/2 the turns will keep the DC characteristics the same as if a single tube were operated at 5K.

For AC the tubes will appear in parallel and net you a 1K25 load for the pair (and ~2.8X the power using first order simple math). The rub comes when you consider that you now have 1/2 the turns present for the AC signal due to the paralleling of the primaries so your AC flux in the core now doubles. This effectively turns a 20W transformer at "some low frequency of interest" into a 5W one at that same frequency.

This doesn't even begin to address the relationships of the windings to each other and the individual frequency responses of each winding. If you do go for this approach, spec a trannie that meets your final needs and simply ask for a bifilar primary and all will be well.

dave

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