On 8 Aug 2009 at 13:02, Tom Chesek wrote: > Part 54-2 is 470V CT .06A That cannot POSSIBLY be correct! In my SG-8 manual, it lists the plate voltage on either tube to be no more than 85 VDC. Secondly, on the schematic diagram, there is not shown any sort of center- tap on the HV winding. Thirdly, the rig uses a 1/2 wave rectifier with a cap/resistor pi filter.