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If you need the service info I can scan it for you. But not right away.
The power supply section is indeed strange. It looks like they kept the overall design of their earliest set and made minimal changes. Instead of using selenium rectifiers to make a separate negative supply they took the high and low sides of the floating 260V supply and put a voltage divider across it tying one point to chassis ground. The ground return will be fairly high impedance, but anything that uses both +/- as described by wa2ise will see a normal impedance.
John
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