by EWBrown » Mon Apr 23, 2007 6:58 am
368VDC B+ is in the ballpark (I've seen anything from 350 to almost 390VDC in some of my amps, depends on PT, linne voltage / time of day issues, phase of the moon, etc Yellow_Light_Colorz_PDT_07
What value for the 1W resistor are you using, sometimes 470 ohms is too low, (depends on the tube manufactureres, some tend to run "hotter" than others)you may have to change to 510 or 560 ohms, there is enough built in lattitude with the adjuatment, that 560 ohms should be good to go. 38 mA isn't going to kill the tubes, you can get away woth 40 mA or even a tad more if the PT can handle the total current load.
Nice looking amp! Definitely, MV rectifiers have to be vertical for proper operation, but apparently no one told the Hickok tube tster company that...
/ed B in NH
Real Radios Glow in the Dark