Hi Ed,
Quote:
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Originally Posted by Ed_Dinning
Hi Frank, how about 4, 807's in parallel for the output. They are still plentiful and cheap as well as running at up to 1KV on the anode.
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It used to be done alot, running smaller valves in parallel for added grunt power. But I must admit I'm not too fond of that arrangement, as I find it too finicky and prone to imbalances and overload of individual valves. Additionally, the total anode dissipation of 'only' 100W would barely be adequate for generating 250W, once you add up circuit losses.
Even a single 813 at 2KV would be pressed to do the job, so I scrapped that one too. No, what I have in mind does have something to do with the number four, but probably in a way few will be able to imagine.
"Once upon a time, faced with a pressing need, They made It. But it was found to be inadequate, so They doubled It. Still not enough, They doubled It
again!
And the others said 'Enough!
'"
Frank N.
Edit & PS: HT rectifier bridge and smoothing cap bank completed. Awaiting testing tomorrow.