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This was built in 2011 to supply high voltage to any triode amplifier that I should ever be so adventurous as to attempt to operate /portable. It's a welded steel box with hammerite-finish and aluminium front panel.
Front panel switches are for 'manual soft start'- 30ohms in series with the mains input, and a second 'Run' switch to short out that resistance.
The 'Volt' meter is 100uA fsd, the ammeter is 1mA fsd. During the ammeter calibration, I managed to connect a 12V car battery straight across the meter, which produced a veritable fireworks display, but the meter was undamaged. So I can say that the protection diode across its resistive shunt does its job!
The Patridge transformer, ex Pye UHF TV Transposer, is marked 3500V 675mA. A little transformer, ex-cassette-recorder, provides ~14V power for the backlights, which are daisy chained LEDs. The capacitor bank is 12 x 440V 450uF, (thanks to SM7OVK for these).
HV out is on a C-type socket. I'm getting tired of flashovers in the C-type plugs. They seem to be good up to about 3.5kV. Anything more and it's all over. Once the connector's sooted up, it can't be reused. What does everyone else use to carry HV? I'm tempted to hardwire between amp and psu. Negative return is on SO-239.
The weight will be measured next time that I take the car to a weighbridge. It's a little heavy for a one man /P expedition.
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