[ARC5] BC-453 B dynamotor hum

[WA5CAB at cs.com]

It would need to be a plate to 70.7 volt line.  Your garden variety 70.7V 
and 25.? V line transformers are line to voice coil.  A 70.7 volt line 
happens to be 500/600 ohm line (it's a long story).  Any small output (plate to 
voice coil) transformer would also do for testing.

The output transformer in the B-model SCR-274-N receivers has a 4000 ohm 
secondary with a tap at 250 ohms.  The A-models are only 4000 ohms and the ARA 
and AN/ARC-5 are only 600 ohms.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 11/01/2015 11:05:51 AM Central Standard Time, 
kgordon2006 at frontier.com writes: 
> If it is not, then you might consider a standard small 70 Volt 
> line-transformer. 
> Radio Shack used to carry those, and transformers like them are available 
> on eBay.