[ARC5] Audio transformers- rewinding

[Kenneth G. Gordon]

On 30 Sep 2016 at 2:26, J Mcvey wrote:

> I think it would be more trouble than it's worth.

I would agree.

> Antique radio supply has some transformers and hammond manufacturing is 
> carried by most electronics distributors.

True.

> There is a good chance that a transformer  small enough to fit in the pot could 
> be found.

Maybe. I haven't had any luck finding one so far.

> What's the max rated output ? 1 watt ? Not exactly a "power beast".

Probably pretty close to that: the rated audio power output at full volume for the early sets 
was 400 mW as I remember it, rising to 700 mW in the later sets.

One big problem is finding an audio transformer with the correct secondary impedance. 
Primary impedance of 8K is not hard to find, but 4K, 600 and 300 ohms is not used much 
any more.

At this point, for those non-restorable receivers with shot transformers, I'll just use the 0.625 
watt tap of a 5 or 10 watt 70.7 volt line transformer.

Ken W7EKB

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