[ARC5] Another hack job...

[Kenneth G. Gordon]

On 22 Jan 2013 at 0:00, Mike Morrow wrote:

> Ken wrote:
> 
> > In any case, I installed a 5631 transformer taken from an even
> > worse-hacked BC-453 and wired it correctly.
> 
> Ken,
> 
> The 5631 was not used in any of the SCR-274-N receivers.

Yes. Sorry. I said the wrong thing: this was taken from an R-23/ARC-5. BTW, 
this had been hacked to receive 22.3 KHz. Coil box removed, Miller coil 
substituted, other blasphemies done to it, a load of Orange Drops installed.

>  I posted T-1
> details a couple of days ago, which are partially repeated below with
> Robert's suggested convention for impedance values).
> 
> RAT, RAV, ARA, AN/ARC-5 models:  T-1 300-ohm secondary (A.R.C. part
> 5631). Primary - 4000 turns #40 enamelled wire, tapped at 2000 turns.
> Secondary - 500 turns #32 enamelled wire.

Yup. That's the one.

> SCR-274-N -A models:  T-1 4000-ohm secondary (A.R.C. part 6308).
> Primary - 4000 turns #40 enamelled wire, tapped at 2000 turns.
> Secondary - 1800 turns #38 enamelled wire.

Don't have a spare one of these.

> SCR-274-N -B models:  T-1 4000/300-ohm secondary (WECO part
> ES-691027). Primary - 4000 turns #40 enamelled wire, tapped at 2000
> turns. Secondary - 1800 turns #38 enamelled wire, tapped at 475 turns.

This was the one I removed that had an open primary.
 
> That must have been a R-23*/ARC-5 donor, and so it has only a 300-ohm
> low impedance secondary.  I'll bet that you did not care about the
> high impedance secondary of the T-1 that would normally be in a
> SCR-274-N receiver.

Well, I didn't have much choice: I sure as heck wasn't going to hack up a 
restorable receiver.

Anyway, I have some 600 ohm headsets and even a 500 ohm speaker, so it 
will work one way or the other.

Thanks, Mike.

Ken W7EKB