I recently acquired an Otari MTR-10 tape machine on Ebay. While it was promised in pristine condition, I am finding a lot of issues. One thing I ran into is that the power supply voltages labeled + and - 26 volts on the schematics (and also on the front panel indicator lamp) are actually coming out at + and - 22.5 volts. I removed the power supply and checked it fairly thoroughly, and it seems to be working fine. In fact, when I look at the regulator circuit, based on a 15 volt zener diode and a resistor divider network, I estimate that it is designed for 22.5 volts. (These are the voltages that power all the audio circuits and most of the op amps in the sensor circuits. However, they are regulated down to 20 volts for the audio circuits and 15 volts at the individual board level as far as I can tell.) The other voltages are very close to the labels on the schematics. Does anyone have experience with these machines to know if there is something wrong I am missing? Thanks.