>From a size standpoint, the 4-65 is not a great choice. Running 2000 volts on the plates, you need a plate tuning cap with about 5000 volt spacing to prevent arc overs on peaks.
Running 1000 volts you need say 2500 volts. The RF output parts in say a DX100 are quite small. Just the 5000 volt plate tuning cap (say 120pf) will be the same size as the entire RF output section of the DX100. Brett N2DTS > > Jim Wilhite wrote: > > You are right Tony. Why do 3 or 4 of them requiring a lot > of filament > > current when one could use one 4-250 or 4-400 or even two 4-125s. > > > > One 4-65 will only give 100 watts out in ideal circumstances if run > > full bore. Might as well have a DX 100. > > That's kind of the plan, Jim. I want to build a table-top > transmitter, > using a single 4-65, modulated by a pair, in AB1. > > I have a modulation transformer with a screen winding on it. I could > use a common supply, running around 2kV from a BC-610 plate > transformer > and a pair of 866's. > > -- > 73 > W5OMR > > ______________________________________________________________ > 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. > ______________________________________________________________ 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.
