[ARC5] Receiver audio impedance

[AKLDGUY]

That's the most helpful info, thank you.
The choke is indeed marked 5634 but I read it as 5631 due to grime. There
appeared to be no marking on the transformer. On the hunch that it had been
fitted upside down, I removed its 3 screws and turned it and through the
grime could make out a faint 5631. I hadn't wanted to do that, and in fact
broke a wire, but now the matter's settled at 600 ohm.

Neil ZL1ANM


On Saturday, March 16, 2019, Mike Morrow <kk5f at earthlink.net> wrote:

> A.R.C. part numbers stamped on receiver output transformer T-1 are:
>
> RAT, RAT-1, RAV, ARA, AN/ARC-5 Receivers:
> Part 5631 -> 600 ohm nominal output impedance
>
> SCR-274-N "-A" Receivers:
> Part 6308 ->  4000 ohm nominal output impedance
>
> SCR-274-N "-B" Receivers:
> ES-691027 -> 4000 or 300 ohm nominal output impedance
>
> SCR-274-N T-1 transformers were never installed in RAT, RAV, ARA, or
> AN/ARC-5 receivers.
>
> The only part marked 5634 is 3 henry AF choke L-15.
>
> If T-1 is stamped 5631 (and not 6308 or ES-691027), then it is the proper
> part for an ARA receiver
>
> Mike / KK5F
>
>
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