Hello

I also have one of these motherboards, which was also a single transistor model, but I successfully modified it to a dual transistor one so that the motherboard supports dual voltage processors.

The parts I used for the modification are:
- some pins for the jumpers
- 1 pc. TL431CZ voltage reference ic
- 2 pcs. MJE13009 power transistor

First you need to remove the jumper wires from the S4 S5 S6 locations and solder pins instead.
You need to remove the D1062 power transistor from the middle. Then you need to solder the MJE13009 power transistor to the two outer locations Q1 and Q2.
After that you need to solder a TL431CZ voltage reference chip to the Q3 location.

That's it, if everything went well it should work.

Hello,
Thanks you for your answer .
A person who was selling a dual transistor card on a peer-to-peer sales site sent me some photos. I put 2 sd1062 and it works. See you soon

This pics...

I just noticed that there would also be a 220 ohm R189 resistor to add.