[Hallicrafters] HT-32B
Langston, Mike
MLangston at pricegregory.com
Sun Jun 22 22:47:41 EDT 2014
The rectifiers have been SS already and the selenium rectifier has been replaced with a diode. The 5v FIL leads have been removed from the sockets.
Several quick replies steered me to the bias adjustment. Setting it at -51V (per the manual for my line voltage) reduces the plate idle current to 52 ma at 800V.
Full rf drive now gets me 65 ma and 1 watt output but most importantly, the plate current is now steady.
So I now assume all is stable and I just don't have enough drive.
Does anyone have rf voltages for the various stages. My rf probe gives me about 18 V at the grids of the finals with the HV rectifier pulled. This peaks with the driver tune as expected. I have about 3 V at the grid of the driver.
Thanks for the help.
Mike KL7CD
Sent from my iPhone
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