[Amps] 4CX10,000D amplifier? TSPA

[John T. M. Lyles]

I see from the posting that Doug has 4CX10,000D and is considering 
building a linear amplifier with feedback. In the same note, it 
states '4CX1000D' also. Since Eimac didn't make a 1000D, but did make 
a 10,000D I will assume that was a typo? Anyway, the application of 
negative feedback to multistage class AB1 amplifiers for HF Comms is 
covered in the1964 edition of Pappenfuss, Bruene, and Schoenike's SSB 
Principles and Circuits,  You might also look at what Continental 
Electronics has been building for HAARP in Alaska, very linear 
push-pull tube transmitters using a pair of these tubes. They may 
also have NFB application to meet the specs. When those hundreds of 
rigs start changing tubes, we may expect to see a bunch of duds 
around. However, they may be getting rebuilds out of them at least 
for a while.

73
John
K5PRO