I was just repairing a Drake L4B that I picked up from my want listing on
QTH.com. I just happened to measure the temperature of the 50K 50 watt
resistors in the power supply with my infrared thermometer and WOW!!
The middle of the resistors run 510 degrees f !! I could not believe it!
Needless to say there outta here! I won’t need them anyway. I’m using the amp
to prototype my QSK board for the Drake L4-L7 amplifiers that will use resistor
cutoff bias instead of the +120 volts that the resistors provide.
73
Jim W7RY
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