w3slk at hughes.net
Sat Dec 1 20:56:11 EST 2007
A fine and fitting job for the RCA 1:1 modulation transformer, with
5,500 ohms on primary and secondary.
**I wish I had said transformer.
If you want to get 'close enough', then, at 1500v, run 4 100TH's in
push-pull parallel in the modulator for effectively 4400 ohms,
plate-to-plate impedance, according to the Eimac tube data sheet.
According to it, a pair of 100TH's in AB(1) has a plate-to-plate load
impedance of 8800 ohms. That's kinda high to work into a 5500 ohm
transformer. 4400 ohms is -much- closer.
**Doesn't that make quite a bit of Cg-p? You would need some large
neutralizing capacitors because of the combined C of the parallel tubes.
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