[ARC5] Receiver audio transformers and other stuff.

[Kenneth G. Gordon]

On 20 Jan 2013 at 16:05, Bill Cromwell wrote:

> > hacking.  None were ever made without one or the other of the four
> > transformer variants.

Yes. ALL came with output transformers....always.

> Thanks for your reply. I suspected none of them were built that way. I
> don't know if somebody yanked out a good transformer for some funny
> mod

ALL BC band ARC-5s which were hacked into "Hi-Fi AM Tuners" had the 
output transformers and the BFO transformers removed...among other 
despicible things done to them.

> or used that circuit because the original transformer opened.

Hardly ever...

> Ken
> was asking about open transformers. Was there actually a mod that
> called for getting rid of the output end of the radios?

Several, in fact. They turned the output stage into a resistance-coupled 
driver to a following audio amp.

> Maybe somebody
> didn't know how to use a matching transformer.

More than likely...

What I was asking was if the collective wisdom had seen enough defective 
audio transformers to tell if there was a common failure mode.

So far, it appears that unless those transformers had been abused 
somehow, they never failed.

I was quite surprised to find this one with a completely open primary: 
however it IS one of the first (oldest) ones out there.

I suspect, from the appearance of the rest of the really glorious hacking job 
done on this particular receiver, that the audio stage had been severely 
abused some way.

Ken W7EKB