Martin Sole wrote:
> Start with an assumption.
> You have a quantity, i.e. more than 10, Eimac 8930's (4CX350R some say)
> with bases and teflon chimneys. Tubes are unknown condition but were
> removed from service a couple of years ago as working. You have a
> quantity of transformers marked 1752 volts rms 275 madc, a similar
> quantity of oil filled capacitors rated 5uF 3000 volt and assorted other
> componentry, non tank circuit.
>
> Question.
> What do YOU think might be the most efficient way of utilising this
> hardware assuming the goal is some minimally specified HF band amp (80
> through 10 metres).
What's minimal - modest power or no frills, or?
What are you wanting out of it - a simple amp for minimum effort or some
fun experimenting?
If it's the former, I think there's incompatibility in the hardware you
have. The transformers will give you 2.2-2.4kVish, which will work the
valves in the region where you need comprehensive protection etc. Where
you have the quantity, I'd put extra in parallel and run them at much
lower voltage, say 1500V, and all the headaches go away.
As a gross generalisation valves are cheap, transformers expensive, so
parallel up the transformers (use a separate bridge on each and common
the bridge outputs) to get the power you want, then choose valve(s) to
suit. A pair of GI7 triodes will cost next to nothing and give you 800W out.
Steve
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