Berrie: The size of the spilt stator capacitor that you are looking for may need to be determined by the voltage and current that you intend to run, The ratio of I:E determines the capacitance There are charts in the handbooks for this purpose. Be sure to consider that you are doing push pull with a balanced tank circuit as the required capacitance is only a quarter of that required for non-balanced. The voltage will determine the needed spacing of the plates. If you raise the tank capacitor above the chassis on insulators and connect the rotor to B+ you can get by with less spacing but you will need to use and insulated coupler to the knob shaft and be sure the knob shaft is grounded for safety. You can also accomplished the same thing by using two large RF chokes, one per tube, and capacitive coupling the RF to the tank circuit as is done in most PI net circuits. This way the plate tank cap can be mounted to chassis and the RF choke at the center of the tank coil can be grounded. The idea is to not have a DC + modulation voltage across the plates of the tank capacitor but just RF voltage. Capacitive coupling, as was just described, is a neat way to do this but it requires the very large long RF chokes and good coupling capacitors. I would suggest looking for 812s for the final and modulate with 811As. I think the 811A is good to 1500 Volts at Zero bias for modulators but can run 2000 if a regulated bias supply is used. The 812s, for a push pull final, are easy to drive and easy to light up. If you're skeptical of their size then use 4 of them.
The nice thing about a single band rig, is that you can just wind your coils and bolt or solder them into place. Making a adjustable output link may get creative though. Good Luck John, WA5BXO ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.