[R-390] Isolation Transformer

[Kenneth G. Gordon]

> I'm looking to buy an isolation transformer for various BA work and
> found these.
> 
> http://www.surplussales.com/Transformers/IsolationXmers.html
> 
> Particularly, I'm looking at these two items:
> 
> (TP)64196-173022,  new - as removed from new, unused equipment.

This one is capable of around 5 amps maximum, but I wouldn't 
run it at that for very long. And it is 115 to 115 so it would work 
well for you.

> (TP)6634  New in the box.
> 

This one has either dual or center-tapped primary and 
secondary windings, so you can connect it as any combination of 
115 or 220 input and 115 or 220 output. However, current 
capability is about 4.5 amps for 115 and 2.25 amps for 220 
input.

This one would be more versatile around the shack. I think, all 
else being equal, I would go for this one.

> Of these, does anyone have any recommendations for either?  

I would recommend the 2nd one.

>I assume
> either is overly sufficient to power a two or three R390s, but not
> sure about other considerations.

I dunno if you could power "...two or three..." at once, since I 
don't remember what the power drain of an R-390 is, but you 
could at least run one.

As I said, at 115 volts, the first transformer will provide about 5 
amps max, and the second will provide about 4.5 amps max. I 
don't think that would be enough for 2 R-390s, let alone 3.

Ken W7EKB