[R-390] Tube Shields/Temperature Instrumentation

[Bill Hawkins]

Don't forget that a 5% drop in line voltage is a 10% drop in power.

Try an adjustable line voltage and see where the set begins to loose
sensitivity. Could we get a report from those who use a Variac to
gently start their radios?

Dig out a six (or 12) volt 2 amp filament transformer and buck that
line voltage back a bit. Add a fan and the shields won't matter.

The R-390 series was designed for a wide range of line voltage. The
heat-removing shield is only required at the high end.

Thoughts for a cold spring day.

Bill Hawkins