Re: Spy Set SSTR-1
That’s interesting , Keith - and it’s great to hear your expertise to validate what is theoretically possible ...
but we don’t know it is running in class C!
Sticking to the verifiable facts in ‘Notes from a user’ (link in post #2) , these clearly state that when the set was in use, the output was up to 10W with the valve horizontally mounted and immersed in motor oil as a coolant! I love this ingenuity!
This is significant, because it suggests that even to get 10W out, anode dissipation would rise above the limit of with this tube of convection in air, (12W) which suggests a class of RF operation with just natural air (not forced-air) cooling that was not particularly efficient, definitely nowhere close to 66%.
It also describes an ancillary RF amplifier for specific use with an RCA 815 twin beam power valve, comfy at 25W out, suggesting that this was the ‘natural’ design for covering the miles with this suitcase unit.
I wonder could we see the circuit diagram?
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Al
Last edited by Al (astral highway); 10th Feb 2018 at 7:16 pm.
Reason: Adding historic detail
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