Valve Crystal Oscillator Grid Current

[pwdrive]

Here is a basic write up on a similar arrangement:

http://www.rfcafe.com/references/qst/a-s...41-qst.htm

And another one where the bulb was used in series with the Xtal in various osc configurations, the brightness of the bulb being compared to the brightness of a similar bulb fed via a pot from a known voltage source for current determination through the xtal (I think?)

http://www.we0h.us/Amateur_Radio_stuff/B...rticle.pdf

Also some good stuff on xtals here including a description of the bulb in series with the xtal:

http://www.bliley.net/XTAL/docs/eng_bull...lletin.pdf

Bliley made the xtals for the early Hallicrafters comms receivers, my Hallicrafters SX17 Super Skyryder has one.

Lawrence.