The world's smallest Vacuum tube TV bar generator ?

[init4fun]

Originally Posted by Kevin Kuehn

Could be it's nothing more than a audio frequency(vertical) and a RF freq generator(horizontal) that beats against the sets scanning oscillator frequencies. That neon lamp on the front may even be used as the trigger in a saw tooth relaxation type oscillator. I've done the same using my function generator and it actually works very well for linearity adjustments. Be aware that such a simple piece as you have there likely does not use an AC line isolation transformer. It would be very wise to have the set under test powered through an isolation transformer.

Thank You Kevin , and yes indeed I intend to run it (the bar generator) on my isolation transformer and the TV I'm planning to connect it to is one of those little 5" B/W portables that takes a zillion D batteries and luckily has an antenna input . It's now just a matter of me digging out that little TV ...

[dieseljeep]

Originally Posted by init4fun

Thank You Kevin , and yes indeed I intend to run it (the bar generator) on my isolation transformer and the TV I'm planning to connect it to is one of those little 5" B/W portables that takes a zillion D batteries and luckily has an antenna input . It's now just a matter of me digging out that little TV ...

I just looked up the Heathkit version and it's similar, with the single 12AT7.
It's a little larger and does have a transformer for full isolation.