[ARC5] Transmitter in 1950's F. Collins Radio Amateur's Handbook

Fuqua, Bill L wlfuqu00 at uky.edu
Thu Dec 12 14:34:12 EST 2013


  When I was a kid our library had a copy of the "Radio Amateur's Handbook" By Fredrick Collins. 
There were 3 transmitter designs in it, a single tube 6L6, two tube 6L6 and my  favorite a 
70 Watt output 80-10 meter AM/CW transmitter using a 829B final.
  This was a single 6L6 driving the 829B with the grids in push-pull. Screen modulated
using a 6V6  and carbon microphone but the plates were in parallel. Ok, perhaps
the output stage was a doubler but there was no hint that it was, in fact the plans specified
B&W 80-10 meter grid and plate coils. 
  I want to some day build this transmitter but would either have to parallel the inputs or 
operate the output stage as a push-push doubler. If the screen grids were independently wired
to the base you could modulate them in push-pull and have a high level balanced modulator for
DSB, suppressed carrier.  
  73
Bill wa4lav


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