Скачать или смотреть GU-81M Hartley VTTC unoptimised test

Hello Guys, i have made some changes to the hartley vttc, its now not using the tube as a resonant capacior anymore and from 2 MOTs in parallel i went to a series combination.
I killed one of my GU-81M tubes with 1A of current, dont overcurrent tubes, overvolt them instead!

I will reveal more about this oscillator in an upcomming video, if you have any questions message me on discord, name: janno288
or leave a comment!

You can tell its greatly out of tune by the Sound at the end and that the RF current doesnt rise significantly anymore.

Oscillator is a vacuum tube harltey oscillator, same one you find in schematics as transmitters.

Resonance frequency of ~2MHz
540μH rf-choke, 325pF 30kV tank coupling capacior, 40pF 16kV 4kVAr doorkbob as the resonant capacior, 2 * 60W for feedback (2 turns), 6.8nF gridleak capacior, tube is wired as a triode all grids together, 470nF 63V filament bypass capacior, microwave transformers in series with 1.5μF of capacitance, 2nF 30kV as diode rf bypass.

Measurements at ~230V Variac:

Secondary Current of ~2 RF Amperes
Power supply votlage of ~4kV DC
Current Drawn by the oscillator: ~ 0.4A of DC

Top connections of the tube are cooled.
Grid 3 is also connected at the top, according to documents of these tubes the top g3 connection improved shortwave characteristics, so why not, probably better for HFVTTC use.