[ARC5] Line-transformers to replace shot audio transformers.

[Kenneth G. Gordon]

On 29 Sep 2016 at 20:10, Dennis Monticelli wrote:

> Good finds, Ken.   

Thanks, Dennis.
 
> Line transformers have no flux gap.  They are not designed to pass DC so saturation can be a 
> concern.

Yes. Mike Murphy's article in Nov 2007 ER Mag on these makes that point.

>  However, a 5W or 10W line transformer should be OK passing the modest Class A 
> bias current of a command receiver. 

Well, the one I had to use works very well indeed. I used one of those Radio Shack jobs in a 
wrecked BC-453 and it sounds very good.

I might add that the line transformer needs a 0.625 Watt tap (which is a common tap, BTW) 
for 8K. The 0.5 watt tap gives around 10K and the 1 watt tap gives about 5 K. The 10K tap 
should work OK, but the 5K tap won't work very well with a 12A6.

The taps are all listed in watts, but since the transformer is a 70.7 V job, R = E^2/P

Ken W7EKB

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