07-28-2011, 09:00 AM
Audio output transformer has open primary. output tube is a 42 and schematic about 3 watts+/- of power. any suggestions as to what I need to replace the transformer 
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American Bosch model 515.
 Audio output transformer has open primary. output tube is a 42 and schematic about 3 watts+/- of power. any suggestions as to what I need to replace the transformer :
07-29-2011, 04:50 PM
Pretty much any output transformer used with a another 42, a 6F6, 6V6,or even a 6BQ5 will work as a replacement, there are others of course but the plate impedance is pretty close between those tubes.
Regards Arran
07-31-2011, 08:41 PM
Or if you want to live life on the edge you can use a 6.3v filament transformer. the 110v side goes to the plate circuit and the 6v side to the speaker.
Terry When my pals were reading comic books I was down in the basement in my dad's workshop. Perusing his Sam's Photofoacts Vol 1-50 admiring the old set and trying to figure out what all those squiggly meant. Circa 1966 Now I think I've got! Terry
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thank you for advise--will do.
