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Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Weee. Tubes.
tubes from left to right: 829B 872A 36MC6 589752-1 832 707B (not high power but really high freq. 1.2 to 3.75GHz, 125mW output) 813 809 4-400x (not sure of the last one because the tube is unmarked) 4E27 4-400C 811A 811A
All of them should work besides the 813 (because the filament is broken )
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Nice tube collection :D
I have an 832 too. It seems to be gassy, but it's a cute looking tube that looks like it ought to have eyeballs on the ends of its plate pins
The 707B tube is a klystron. The little copper neck part of the bottle fits inside a resonant cavity, and the tube will amplify or oscillate at the frequency of the cavity. If you can get it working and detect the RF with a Schottky diode in another cavity, you'd get major geekpoints
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
here is picture, how have to look pcb
and here is my summer project, very high power SMPS, he have 8 FDH44N50 power mosfet's, each mosfet have driving circuit, with 3 independent power supply for high and low side mosfet's, it give incredible driving probabilities.... ISOTOP diodes are 175V and 800A Vdrop is just 0,5V . Working frequency will be between 30KHz~200KHz. this driver show what he can, in short circuit (output) at low voltage he melted power supply wires, which was quite large capacitor are Revox Rifa 3300uF 400Vdc (thanks to 4HV member)
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capacitor are Revox Rifa 3300uF 400Vdc (thanks to 4HV member)
