[Boatanchors] Johnson Valiant Question

[Bill Pancake]

Could really use some help here from those of you who have had experience with the Johnson Valiant xmtr. Three questions...

1) Why does the 1.6 amp slo-blo low voltage transformer primary fuse blow after an hour or so of just sitting there with the filament switch on with no plate voltage applied? The 300 vdc and -250 vdc bias circuits are reading as they should when measured. Transformer and filter choke case temperature are warm to the touch but not "HOT"

2) What is the correct setting for the voltage at the modulator grids (pin 5)? Page 9 of the ops manual says "-55 volts", page 31, socket voltage chart says "-46 volts", and the assembly manual eratta sheet says "-35 volts".

3) What is the correct voltage for the RF amp bias? Page 8 of the ops manual & the socket voltage chart says "-70 volts", service bulletin #1 says "-52 volts" and the assembly manual errata sheet says "-85 volts".

Any help here would be greatly appreciated. Thanks, Bill, ab0zz at arrl.net