20-07-2021, 10:04 PM
Microbee original power supplies were 12v and yes the voltage regs got very hot indeed with no/little ventilation. Later units were supplied with 10v supplies. I personally use a 10v Compaq Laptop power supply after changing the end plug. I also use a PS2 8.5v power supply that puts out about 8.8v and both work well for everything I have and nothing gets hot. So I dont think you will have problems with your 9v supply.
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ChickenMan
ChickenMan