[TenTec] 262M Power Supply transistor

[Winston F. Jones]

Does anybody know a replacement for the 2N6258 TO-3 style transistor 
used on the back heat sink of the Ten-Tec 262M power supply? I cannot 
find a 2N6258 listed in any of my electronic catalogs or substitution 
books.

I recently bought a used 262M that doesn't work. The meter lamp lights, 
the transformer works and the rectifier works. I read 25 volts DC 
coming from the filter cap. However, there's no 13.8 volts anywhere in 
the power supply. I suspect something wrong in the regulator board, but 
I'm awaiting a schematic to figure out what it is. However, I did 
notice some bubbling on the case of the 2N6258 transistor which leads 
me to suspect it will need replacing, even if the main problem is in 
the regulator board.

Any suggestions on fixing this power supply will be helpful. I've never 
delved into a Ten-Tec supply before and it looks mysterious to me. (For 
example, most power supplies I've owned before have four pass 
transistors on the back heat sink, but the Ten-Tec has only one!)

73, Winston K4CWQ

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