|
Cory,
What voltage drop to you measure across the resistor? The 6AL5 draws .3 amps @6.3v so you should be dropping about 1.5v across the resistor. Is your filament voltage correct?
Why it's there I can only guess, there is also a small resistor in the filament lead of the horizontal sync discriminator 6AL5.
There is a filament spec for the 6AL5 with the cathodes at equal potential, maybe because they are not in this circuit the designers lowered the filament voltage. (??)
Chuck
|