>
>Barry Kirkwood wrote:
>>Which just perhaps leads us back to Ian's comments on the Collins 30S1,
>>big screen supply with choke input filter in series with anode supply,
>>bias supply also stiff but value floating with mains variations in
>>sympathy with the other values.... Add Ian's screen protective sensors
>>in series with the screen feed?
>>Way to go if you have the iron lying around?
>
>Not unless you have some very special iron. The anode-cathode voltage
>comes from two separate stacked power supplies, connected at the screen
>(chassis). Therefore the "anode" and "screen" supplies each need to be
>rated at about one amp. The only regulation in the original 30-S1 was
>from choke-input power supplies.
- These supplies use resonant-choke filters. With simle choke filters,
the transient V-reg. on SSB would have been unsatisfactory.
>It relied very much on all the supplies
>(including G1) varying in proportion to one another... though exactly
>what that guaranteed in terms of linearity, I'm not quite sure.
>
>The 30-S1 was very much "one of a kind". Although it contained a number
>of novel concepts, not many have stood the test of time, and
>particularly not the split power supplies.
>
- Amen, Ian
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
end
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