>
>I already put this on the AM lists, but I got no bites. Maybe some
>amplifier builder has a stash of ancient iron....
>
>I need a 500 Watt modulation transformer for a homebrew project. It
>should have roughly 16 k Ohm plate to plate Z for the audio side and
>about 6-7 k Ohms for the RF side with 1/2 Amp DC through it there.
>
>Stancor, UTC, Thordarson, SNC, all made universal transformers 50
>years ago, and I have plenty of ancient part numbers to pursue. But
>who has this old iron laying in their junkbox?
>
>If you have something that looks like audio transformer, and its
>about 50-70 lbs, please let me know and I will check the number
>versus my 1952 catalogs.
>
/\ Peter Dahl can build one. A caveat -- The old modulation xfmr Z
formula is in error because it does not compensate for the (50%) negative
R region of modulation. A closer match can be had by analyzing +peak
currents and +peak voltages. Congrats to Eimac's Mr. John Reinartz
(RIP) for his slam-dunk essay on plate (anode) modulation analysis.
>
cheers, John
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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