Quote:
Originally Posted by diamondsouled
Never knew about the AC plug 32 volt thing. Good to know  . |
Hopefully all previous owners didn't do that... The 6V tubes were likely wired in series, along with a dropping resistor off the 32V supply (they all draw the same 300ma heater current). If someone did apply 120V, possibly only one of those tubes would go open. Tube heaters can take over-voltage, as part of the manufacturing process tube heaters are run extra hot to boil off and/or activate the cathode. But not for real long.
Output tubes don't make much audio power off 32V, so running a pair push pull is done to get something listenable.