[TenTec] Model 260 PSU factory modifications

[Steve Hunt <steve@karinya.net>]

I recently bought a spare Model 260 PSU. Checking it out, on the 
regulator board I found a missing diode, and an extra diode, resistor 
and PNP transistor tacked at the rear of the PCB.
At first I thought the previous owner had made the changes, but I 
checked my other 260 and it's the same. The schematic in the manual does 
not reflect these changes.
I wonder if anyone knows the reason for the modifications, or if anyone 
has a later schematic that shows the changes?
Steve G3TXQ
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