[HBR] Re: GB> Part Wanted: Let's Swap!

[Mike McCarty]

EP Swynar wrote:
> Good Day All,
> 
> Further to my single-tubed RSGB keyer, I am convinced now that the problem
> with it being non-operational may be directly attributed to the fact that I
> used two separate single-ended audio output transformers (connected in
> series) in the oscillator portion of the circuit, instead of the single
> push-pull unit prescribed...

With an ordinary Hartley, that would not be a problem. No
electromagnetic interaction between the inductors is necessary.
However, you have a modified Hartley, which is partly Hartley
[ha!] and partly tickler, and partly blocking oscillator,
and in this case you need it.

Someone posted this...

http://www.electronicsurplus.com/ccp78705-audio-output-and-impedance-matching-transformer---z3663-39788.htm

Mike
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