[Hallicrafters] Technical questions:

[Waldo Magnuson]

Carl (KM1H) said:
Sometimes a little change of pace wakes up a usually dull and dead 
forum.
Im rather surprised that there are so few threads of a technical nature.

So here is a technical question of sorts:  I have a simple power supply 
which has a tube between the output of a 4 diode bridge and the B+ to 
the equipment.  I can not read the tube type on the glass (it's been 
polished off).  The diode bridge connects to pin 1, pin 2 goes to 
ground through a 2.2K, 2W resistor.  pin 5 goes to the output (135 
volts).  No other connections - it is a 9 pin (or 7 pin - I'd have to 
look again) miniature tube.  I would like to know what type of tube it 
is for drawing the schematic.  How do I identify it?  Is there a visual 
tube expert out there that if I sent a close-up picture it could be 
identified from the structure?  I suspect it is a ballast tube but I'm 
not sure.

73,  Skip W7WGM