Re: the WORST ham built amplifier?
开云体育I guess efficiency and IMD will improve with 6500V at the anode, but 10m will be difficult to tune and on 160m the Gates inductor might be too small in inductance. Mine is run at 4800V, 10-160m on any frequency, no tuned input. Second RF choke is shorted out from 40m down while another short across the roller inductor is taken out by deenergizing another relay. Yes, W6CCPs rack was probably a Henry 3000D generator, perhaps the OEM version by Perkin Elmer. I modified many of them, most to mono band amps, three out of 10 to all band. ? 73 Peter, DJ7WW ? ? ? ? ? ? ? ? -----Original-Nachricht----- Betreff: Re: [ham-amplifiers] the WORST ham built amplifier? Datum: 2024-11-06T17:49:25+0100 Von: "Jim VE7RF" <jim.thom@...> An: "[email protected]" <[email protected]> ? ? ? Reid, can you safely put 6500 vdc (loaded) on a 3x3 tube ?? ?What about IMD with that voltage ?? ?Most folks are getting 68% eff on the lower bands (160-30m)....with 4800-5500 vdc loaded...and a little less on 20-17-15m.? ?Typ they are driven with a 200 watt xcvr in most cases, but not always.?
That RF deck appears to be a Henry RF generator, modified with a roller coil and 2 x vac caps.? The 3x3 will typ hi-pot test to 20 kv (anode to grid).? Do you remember what was used for the tuned input ?? ?Was it a mess of bandswitched PI networks, or direct driven ??? ? ? |
