[RodB]

I would use that transformer then increase R26 to maybe 1500 ohms each to get the correct B+. To get the 6V6 plate voltage down you may have to add a small resistor around 100 ohms between the ot primary and B+. Remember, these voltages were probably taken with older test equipment and with 115-117 volts on the primary so you would probably have to make adjustments even if you had an exact replacement transformer