Huge thanks to Ed, W3NR, for sending this to me! It is a hand written
letter to 'Tom' (not sure who this is) from Ten-Tec dated Feb 13, 1978.
>From Ed:
"I also have a hand written how-to on adding a pre-amp to the RX. I did
this mod also and it made a remarkable improvement to the C21's
sensitivity on all bands, most noticabbly on 10-15-20. This how-to is
dated 2-13-78 and was written by Dick Frey W1FCC/K4XU then the Chief
Engineer at Tentec."
You will find the 3 handwritten pages here:
https://drive.google.com/drive/folders/0B_pjAwEfeYcdQlQ3OVpwbW9xVm8?usp=sharing
You will also find two interesting articles that Ed sent me. Both are from
73 Magazine:
*Little Extras for the C21 (73 Magazine, 08 August 1979)
*AGC, PDQ (73 Magazine, 05 May 1986)
Enjoy!
73,
-Josh WA7FPV
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