[HAM] Leslie 122/147 Output Transformer Numbers?

[David Anderson]

I'm pursuing a question, and I need some data, so I'd like to know if  
anyone has ever noticed a four-digit number printed on the bottom  
bell-end of the output transformer in a Leslie 122 or 147 amplifier,  
something like 2379.

This is NOT the Leslie part number from the service manuals; it's the  
Triad Transformer part number, which is much more informative. You  
can't find Triad's number in the Electro Music documentation.

Here's what I want to try to determine: were all Leslie amplifier  
output transformers essentially the same, regardless of whether  
Electro Music assigned various different part numbers to them?

Thanks,
David