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Otari MTR-10 Series

Otari MTR-10 voltages

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10 years 5 months
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.