Interesting idea! I have some 4-125 tubes, however, they like higher voltages, which means bigger parts like chokes, plate tuning caps, insulators, etc. You can get 300 watts out of a 4-125 at 2500 volts with plate modulation. How would you modulate a 4-125 with one 4-125?
In anything other than plate modulation, you will have the high voltage, but low efficiency and likely under 150 watts out, under what a pair of 4D32 tubes at 700 volts would do.... Brett N2DTS > > How about a pair of 4-125A's using one as modulator the other > as final > and use a microwave oven transformer for plate power, keep > everything in > one case. > > Brett Gazdzinski wrote: > > >What would you build/want as a 40 meter hi fi AM transceiver? > >I want to limit the power to the 200 watt and under class, but > >can put the high voltage power supply in a separate cabinet/rack, and > >sit the transceiver on the operating desk, to save space and weight, > >or, run one 4d32 at 100 watts with everything inside one box. > >With a separate power supply, I could likely go to 200 watts > >out of 2 4D32 tubes, or something different? > > > >It can be simple, frequency select switch, rf gain, S meter, mic > >gain, plate tune and load, rit,xit?, bass and treble audio EQ. > >I will likely put many meters on it, for grid drive, plate voltage, > >mod current, negative cycle loading , etc., can be a multi meter, or > >separate meters (I like meters). > > > >Or I could build a regular receiver with regular tuning, and > leave the > >trans xtal controlled, digital display receive frequency readout. > > > >I can include 2 bandwidth choices, say 5.5 and 4 KHz on the > receive filters. > > > > > >What would YOU want in a 40 meter transceiver for AM? > > > >Brett > >N2DTS > >
