At a glance, the voltages on the valve pins do look pretty normal, or pretty much what you'd expect, so, looking good so far, if the power transformer doesn't have a center-tap wire for the 6.3V AC heater supply for valves V1 to V4, you can make a virtual center-tap by using two resistors of same value, say 100 Ohms, connected as per this diagram:
Sometimes the heater-supply is deliberately made to float at a voltage above chassis ground in order to reduce the heater-cathode voltage so that no short-circuit or leakage occurs, from memory, the maximum heater-cathode voltage rating for a 12AX7 is about 100V or so, but I could be wrong, in any case, the maximum heater-cathode voltage should not be exceeded.
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