>
>In an old 5CX3000A 1.6-32MHz amp I am working on, the plate blocking caps
>are rated at 8KV. Can I guesstimate from this what plate voltage was
>intended?
// Eimac rates the 5cx5000A at 7kV in 24/7 AØ or FM. 8kV in SSB
service should be ok. The rated scrren potential is 1000v max. To
utilize the 5cx5000A's c. 6.5A-pk emissive ability, anode and screen
potential should be maximal. The 8kVDC blocker-C rating sounds adequate.
5kVDC vacuum caps are ok with up to c. 3000v-pk at 32MHZ. This suggests
that the TMC anode-PS was roughly 4000v. For SSB use, I would consider
removing the resonant filter -choke, converting to a C-filter, raising
the screen potential. P-out should then be about one standard 6db S-unit
better than a SB-220. To run it at c. 1500w, tune it up at full
throttle - then back down the mic. gain until the anode-I barely wiggles.
Increase mic. gain as needed to maintain communications.
>It was made by TMC, presumably to commercial or military specs.
>
>If it helps, it has vacuum variable caps in the tank rated at 5KV.
>
cheers, Jerry
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
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