New Roundie sets scored

[Chad Hauris]

When I repaired my 1967 CTC-28 I hooked up the power line to the high line voltage tap. I think a few years later they began to use the normal/high switch.

On a 1968 Sylvania D12 set, it actually has a normal/low switch to boost the power transformer voltage in low line voltage areas.

I used a 1970's RCA XL-100 power transformer to buck the line voltage going to a Harman-Kardon A300 amp. The amp was causing 6V6 tubes to short out due to high B+ voltage caused by high line voltage. Some of the old equipment was rated with a 115 or 117 volt AC supply and todays higher line voltages can cause excessive power supply voltages.
I used one of the secondary windings (I think CRT filament) as the "buck" winding in series with the primary winding. You just have to make sure the phase is correct and measure the output voltage before connecting..one way of connecting the leads will add to the primary voltage and the other will subtract.