Heathkit IP-27 Power Supply Trouble

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I already know that transistors should be the same if wired in parallel. What I've noticed, is that the transistors in the actual hardware are the same, but in the schematic they aren't. Also, the transistors they suggest, aren't identical to the ones in the schematic.
 
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The schem shows both of the two paralleled as 2N2147 if I read it correctly. They must be the same type. The one above those two can be different because it is not in parallel, it is their driver.
 
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bountyhunter said:
The schem shows both of the two paralleled as 2N2147 if I read it correctly. They must be the same type. The one above those two can be different because it is not in parallel, it is their driver.
Click to expand...

Right, but guess what transistor is actually in the hardware? The 2N2869 is used instead of the 2N2147.
 
ElectroNerdy said:
Right, but guess what transistor is actually in the hardware? The 2N2869 is used instead of the 2N2147.
Click to expand...
Heathkit often substitutes similar parts. I suspect those are similar germanium devices. I couldn't find them in my ancient books, but they probably interchange.
 
Heathkit IP 27

There is a Recommended Heathkit Update to This Supply!
Go to The Yahoo Groups Heathkit Group and Look under Files for the IP 27.
 
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