[R-390] 6DC6 Replacement

[Barry Hauser]

Alex wrote:
.> 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.
.
Am I to understand that you failed to replace the vacuum with fresh, uh,
nothing? ;-)

For effect, you're allowed to add a mini orange LED for glow, but it should
be driven by a EEPROM so it blinks the following message in code:  "Warning
to hollowstaters:  Glass envelope contains solid state components which may
be offensive to your sensibilities.  This message in compliance with Truthi
in Thermionic Emissions Act of 2002."  If you use more than one of these,
they must be synched.

Seriously though -- I'm interested in your tube cutting technique.  Handy to
make up 7 and 9 pin plugs out of bad tubes.

Barry