[R-390] 6DC6 Replacement

[Scott, Barry (Clyde B)]

Yeah, but how well did it work after you de-gassed it with the Zippo lighter?

Looks like I should just sell my R390A and go get myself a radioshack rx...

Barry - N4BUQ

>  
>  
>  Hi Steve:
>  
>  I confess! I've poked JFETs into both 26C6 mixers on my 
>  R-392, and those
>  24-V stages work really well. I used a Dremel tool cutter to 
>  scribe the
>  glass of 7-pin miniature tubes, cracking them open and 
>  removing the innards.
>  I then soldered the JFETs with drain source and gate 
>  connected to the old
>  plate, cathode, and grid leads, respectively. After 
>  inserting a label with
>  my callsign on it, I then glued the glass envelopes closed. 
>  I popped 'em
>  into the R-392, where these solid-state jobbies perform 
>  flawlessly. I can
>  elaborate about the glass cutting procedure if you're interested.
>  <snip>