Excuse my ignorance on this, but could a heater and cathode not be taken out of a valve ad used in a TV tube?
Looking in the neck of a tube the heater seems to be rod like as in a valve.
Adrian
Looking in the neck of a tube the heater seems to be rod like as in a valve.
Adrian
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve







