by EWBrown » Sun Mar 25, 2012 7:19 pm
I've run four 16A8s (same as 6BM8, but with a 16V, 300 mA filament) with a 16V, 2A switcher, with good success in a modified K-502 amp, it worked very well, and eliminated the otherwise unsolvable
60 Hz AC hum issue, that was a result of a combination of a poor printed circuit board design and layout.
FWIW, this amp can also run 11BM8s from the power transformer's 11 VAC winding, too - I put in a "hidden" DPDT filament voltage selector switch, inside the chassis.
They do have the "hum" issue, though it isn't really serious, just a minor annoyance...
I also have some very compact 5V, 2A SMPS which should be good for lighting up 300Bs, thoughI haven't yet tried them. They will fit very easily and neatly under a 2 inch deep chassis, one for each tube.
HTH
/edB
Last edited by
EWBrown on Wed May 01, 2013 3:08 pm, edited 1 time in total.
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