[R-390] Role of the 3TF7 in PTO frequency changes

[Flowertime01 at wmconnect.com]

Kurt,

Will you please conduct two more experiments and report the results for us.

Test 1. Short the ballast tube out and install 12BA6's in the BFO and VFO.

Test 2. Use 5749's in the VFO and PTO and use a 12BY7 as a ballast tube.

The question is, does the ballast tube really regulate the current short 
term and long term better than lower filament current of the 12BA6's or any 
other filament at .6 amps.

I see the argument for the ballast tube smoothing short changes when the 
receivers were run off generator power. Also the ballast would smooth line 
transient from devices being switched on or off.  I do not see any long term 
regulation as the line voltage drifts several volts do to power line sag as 
the neighborhood changed demand during the day.

Thanks

Roger Ruszkowski