[R-390] R-392 fun!

[frankshughes at aim.com]

Hi,
I had some fun coming up with all the pieces and parts (some assembly required)
to get the "new to me" R-392 working and make SSB easy to tune.


- Found a 28vdc 9-amp LAMBDA switcher (small form factor) on e-swamp
- Skycraft surplus had a ball bearing 24vdc fan
- Sporty's pilot shop had a nice, compact 28-12 DC converter 
- Electronic specialty products had the tiny PD-2 SSB adapter operating on 12vdc
- JAMECO electronics had a little 12vdc audio amp
- Mouser had a 47k ohm audio taper pot.




http://i180.photobucket.com/albums/x257/fish1_07/R392_lambda_dc_converter.jpg
http://i180.photobucket.com/albums/x257/fish1_07/collins_R392_ssb_speaker_power2.jpg
http://i180.photobucket.com/albums/x257/fish1_07/R392_amp_speaker_ssb1.jpg


The R-392 did not work when I received it, found V201 (1st RF amplifier) shorted.
I did not have any 26FZ6, but a 26A6 was the optional replacement I used to get 
the R392 going until I could find a 26FZ6.


Turned out there is a local source for the 26FZ6, including a very interesting copy 
of the original 25 Sept 1958 letter starting the development of this unique tube.


http://i180.photobucket.com/albums/x257/fish1_07/26FZ6letter1.jpg
http://i180.photobucket.com/albums/x257/fish1_07/26FZ6letter2.jpg


73
KJ4OLL