Steve says:
>The only problem will be finding a radio that's good enough to
deliver a
>clean drive signal.
I don't think that's the only problem. There is also interpretation of
results. At the end of the day, the results will indicate either:
1. The principle is capable of producing a clean signal
2. The principle as embodied in the test amplifier is not capable of
producing a clean signal.
If case 1 is the result, that's all it proves - not that all G2DAF type
amplifier implementations produce clean signals.
If case 2 results, it still doesn't mean that it is impossible to produce a
clean signal under some conditions. If case 2 results from tests on the
original G2DAF (assuming that the original tubes are still good), then it
definitely throws doubts, but doesn't prove that the principle can never
work under any circumstances.
Incidentally, in view of the grid current loading, I would suggest that
either a tubed exciter with a tuned output network, or some form of input
tuned circuit be put in the line between exciter and amplifier be used to
minimise difficulties with load change caused by grid current. Preferably
the former, since the intention is to reproduce the original work.
By the way, can anyone get hold of the original UK patent?
73
Peter G3RZP
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