[ARC5] JFET in ARC-5 TX oscillator socket

[Ian Wilson]

I dug out a seriously hacked T-20 or T-21 (someone has applied black paint to
the tuning dial, and the tuning mechanism is missing a set screw).

Connected a junk box 2N5485 (high-gm RF JFET) to an octal plug thus:
  - pin 3 = drain
  - pin 5 = gate
  - pin 8 = source

Removed all the tubes, plugged in 1626 socket. Applied 12V to pin 3
(bypassed to ground) and ground. Result is a rock-solid signal (hasn't
shifted anything like 10Hz in 10 minutes (!)). Room temperature here is
pretty stable, but this is better than any other LC VFO I've ever used.
Frequency = 5.113MHz (so probably a T-20?). Last time I am fairly sure
I used a 2N3819 - I imagine that any RF JFET would do fine.

Again, I don't want to encourage hacking, but if you have a unit that
has already been "converted" then this is at least as good a use as some
others that I've come across <g>.

73, ian K3IMW