A(nother) ballast resistor question
This is a photo of a power supply for an old amateur radio linear amplifier. Notice the item marked "R109". This is a specific model of what amounts to one of the old radiant heater units, which screwed into a parabolic mirror reflector like a light bulb, an early, and dangerous, portable bathroom heater. In this power supply it is used as a ballast (I believe) for the power tube filaments supply
Pair of 813's I would love to have one of these old girls but frankly my days of lugging "boat anchors" around is likely over with
This is a photo of a power supply for an old amateur radio linear amplifier. Notice the item marked "R109". This is a specific model of what amounts to one of the old radiant heater units, which screwed into a parabolic mirror reflector like a light bulb, an early, and dangerous, portable bathroom heater. In this power supply it is used as a ballast (I believe) for the power tube filaments supply
Pair of 813's I would love to have one of these old girls but frankly my days of lugging "boat anchors" around is likely over with
