Hi folks too! It's over four months since I was last on Classiccmp, and I almost feel I need a delurk! My thoughts: These beasts use 5V for the logic, and somewhere around 9V (not critical) for tape motors and things. A 9.5V power supply is bound to be unregulated (why regulate it to a voltage that's not critical when all you're going to do is regulate it again to the voltage that is). Recent threads have pointed out Commie machines of that date with regulators on the board. And finally, the two voltages in the PET (the Commie with which I'm familiar) are 5V (regulated) and 9V (unregulated) (FWIW, the PET 8296D just took 5V and 12V from a SMPSU, but that was a special case - an internal disk drive wanted 12V fairly well regulated for motors) So I am 99.99% certain that it just needs a load to bring it down. To test it, the easiest load to use is an auto bulb. A stop lamp / indicator bulb is rated about 2A at 12V (well, 21W is 1.75A). Stick that on the output - the bulb should survive if it remains up at 14V, but I expect you'll see it come down to about 10V. Just my 2d worth. Philip. ________________________ Disclaimer Notice ____________________________ This E-mail message is private and confidential and should only be read by those to whom it is addressed. If you are not the intended recipient, you are hereby notified that any dissemination, distribution, copying, reproduction, modification or publication of this communication is strictly prohibited. Please delete the message from your computer and destroy any copies. This message is not intended to be relied upon by any person without subsequent written confirmation of its contents. This company therefore disclaims all responsibility and accepts no liability of any kind which may arise from any person acting, or refraining from acting, upon the contents of the message without having had subsequent written confirmation. If you have received this communication in error, or if any problems occur in transmission please notify us immediately by telephone on +44 (0)24 76 424000