Editor and Engineer's RADIO HANDBOOK
Chapter 26-8
A pushup 4-250 Kilowatt Amplifier!
This is the second big project for the winter.
It will be modulated by a pair of 810's with a UTC CVM-5 mod iron.
If you happen to have a 1956 14th Edition of The Radio Handbook, you will find an example of this class C amplifier deck on page 566.
A B & W CX-49 butterfly cap and HDVL coils to the coupling work for the pair of 4-250's!
Currently setup on 40 meters, a single vacuum cap would be normally used. On 75 meters, the other vac cap would be chosen. Note the RF shielding used on the "trap" door!
Separate filament transformers and cooling fans are used for each tube. The meters are shielded and an on board bias supply were part of the original design.
This rig was used by a Detroit ham, W8WHC Robert Crisler of Pontiac. It was acquired by Paul, AA8OZ in the estate sale. From the workmanship displayed above, it is obvious he was very proud of the transmitter! I hope to get it on the air soon and let it fill the airways with RF once again!
73 Steve
W8TOW