The James Knights Co. JKTO component - 2

What was inside.

From part 1, the circuit either had no output or produced a signal on 10 MHz. When I plugged in the oscilloscope, there was no output. The cylinder did warm up, always. Curious as I am, I couldn't resist but look inside .... to find a surprise!

A previous owner has replaced the innards with a 10.000 MHz crystal oscillator and used the heater to give it a form of ovenised stabilisation.

Ingenuity in pure state. A true hack. 

I wonder if the XTAL was actually cut for ovenised operation, otherwise it would have operated in a steep area of the f/T curve. Today we can achieve better performance with a GPSDO, and it will consume less power so the circuit has been dismantled giving: a 220/9V 300mA transformer, a large 10000 kHz XTAL to play with penning (lower freq) or grinding (higher freq), an experimental octal socket and an extra cool hand warmer. 

If I will ever get to it, if the XTAL can be pulled up to 10.100+ MHz it will be part of a valve transmitter on 30m. One more project in the to-do list!

Tightly build oscillator.