Varo pretty much owned the market on those things, didn't they? I think they were the first to produce them. I agree the 1969 introduction of this model would have been just a bit early for SS. I assume the GR2000 series sets used a solid state HV rect or tripler?
I have an ECG solid state replacement here which I think would work in this set should the 3CU3 ever give problems.
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