Phil wrote:
Anyone know which variacs to avoid? The brands I am thinking of are; Staco,
Calrad, General Radio and Superior Electric (which I think is the same as
powerstat???).

Hi, Phil

I have a 4 Amp Superior Electric "Powerstat", and it seems of nice
quality. A one amp Ohmite variable autotransformer also seems OK.

73,
Ed Knobloch