Geoff said: 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. Mod-U-Lator, Mike(y) W3SLK ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
