On connecting transformers back to back to make an isolation
transformer.

A pair of 6.3 filament transformers, back to back, was a
popular kluge back in the '60s, but NOT for use as an
isolation transformer for testing radios.
Yes it was an isolation transformer, but it was to provide
an isolated 120 VAC for a B+ supply on small projects.

That 5 amp secondary at 6.3 volts translates to only 270 mA
on the primary side. Two transformers back to back is only
going to be good for about 200 mA load on the "isolated"
side.

AA5 "hot chassis radios from "back then" were typically 30
to 40 watts. That's 250-349 mA. This would be marginal at best.

It never fails to amaze me the number or ways people can come
up with to do things the wrong way. Then the amount of time
they waste trying to justify it.



--
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com