Does anyone know if a power transformer for a model 87 will work in a model 86? The schematics look almost the same.
Well.....philament voltage for 71A is 5V at 0.25A and for 45 is 2.5V at 1.5A, so the "C" winding is different. Otherwise it would work.....
Thanks for catching this morzh. I didn't dig deep enough and wrongly assumed the filament voltages would be the same.
Dave,
What sucks that for the most part they are the same
Except the Pus-Pull section.
Then again, maybe you could fit the 45s into it instead of 71A
Could require some mods....
The issue with the #45s is that they require more B+ voltage, and more bias I believe, I think you can use the same output transformer. It may be pretty close anyhow, the #45s run ar 2.5 volts but draw 1.5 amps, the 71As run at 5 volts but draw .25 amps, so the same winding with 1/6 the current draw. Are you sure that the original transformer has failed? Does it run hot, or smokes, or is open circuit?
Regards
Arran
It's definitely shot. It looks like someone attempted to "repair" it before me and literally toasted the PT. The good news is that I found a stripped down 86 chassis on eBay that still had the PT on it. I took a chance and bought it for $30 and after I rewired the primary and CT leads it worked like a charm. Reinstalling it will take a while but it looks like I'm back on business.
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