[Milsurplus] Another manual/rig oddity

[CL in NC]

In the TCS manual, the bleeder resistors for the 400 and 225 voltage are both a 12.5K 12 watt unit.  Looking at the  tube pin voltages for the final, 420 or so, is specified, and in the manual you are told to expect 400 to 460 depending on the type of supply used and the power source.  At 400 volts, that is almost 13 watts being dissipated, at 460v,  almost 17 watts.  My TCS supply is rebuilt using most of the original iron, solid state and new parts,  so can't look at those resistors to know if the manual is a misprint or not.  I had an original TCS 110 AC supply 50 years ago, and remember a  few very large resistors that snapped in large cartridge fuse holders, if that is them I know those have to be bigger than 12 watts.  Another interesting number, if you assume 400 plate volts, the current drawn by the bleeder is 32ma, and if you add that to the max CW plate current of 180ma as shown in the red area of the plate meter, you get 212ma, which is exactly what is stamped on the nameplate of the plate voltage transformer for current rating.   Of course that xfmr can take alot more than 212ma when used in ICAS service, but wonder, instead of an off the shelf unit that was maybe 250ma, the Navy ordered one custom made that was exactly 212ma.

Charlie, W4MEC in NC