"Trader" said:

As the original poster I would have to agree with Patrick. I ended up buying
a 500 watt step down/up transformer. I just hope it doesn't introduce noise
that is audible in my little tube amp.

Just put it away far enough.
I'd say about half a meter or so would be enough.

--
Sander deWaal
"SOA of a KT88? Sufficient."