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** I will ignore some of your L figures (it's very difficult to measure inductances of the windings on a non-gaped iron transformer, cos they are large an non linear. )The diagram shows *very* typical R vales for a push-pull audio output tranny of about 60 to 100 watts rating - ie 65 and 59 ohms for the CT primary and 0.66 ohms for an 8 ohm secondary.
The other 4 windings may be also secondaries, allowing various impedances to be added in series or parallel.
My next trick would be to connect the full primary to a Variac and wind it slowly up while monitoring the current flow on a DMM.
Long as the current stays below 100mA all the way to 230VAC, then you can find the secondary voltages, get ratios and be in business.
BTW: what does it weigh?
Any decent 100W valve output tranny weighs about 4 or 5kgs.
BTW2: 70 is NOT old !!
.... Phil