Hi Ralph,
I have to sheepishly admit that I bought two of them used many years ago, one with cloth leads on what I believe is a U.S. built transformer and one with what I have read is a Japanese produced transformer. I took them to my tech upon purchase and he said everything was within spec and I have used them extensively without problem, although as of this time they are no longer being used, to be sold one of these days when I have the energy. Maybe the prior owners serviced them.
George