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Found your pics in photo section. Labeling on transformer yields 1A across all windings, likely because
they are all a common center tap. I would expect the 6.3v winding to be around 3Amps? Is there just
the single 6.3, or is it split into 5 / 6.3?? In a couple of the pics, 20241129_160556.jpg and
20241129_152617.jpg, the transformer appears to have been stressed.? Appears that there is some
discoloration already, though may just be a light artififact when pic was taken.
Bear in mind that that transformer has a lot of windings on it, and 1 intended (main) to be used at a time.
You draw double the current, and you may end up saturating the core. Not good.

You might get away with drawing greater current at a lower voltage winding, but looks like
you are already connected to the 45v tag. Higher Voltage? No way would I do that as the supply sits.
Pass transistors exhibit wear on cases, hope surface of the mica insulators is not compromised.
1 transistor likely for voltage, other for current. If supply set for 5, and transformer is connected at 45,
with a 1A draw, the voltage pass transistor is going to be dissipating ((45-5)x1) 45 watts of heat.
Doubling that to 2amps and you likely are going way outside design specs and looking at a much
higher junction temperature in the transistor.? Plus, you don't know how close the main caps and such
are in relation to working voltage rating compared to actual voltage.? If a diode has become 'leaky' and
allows excessive ripple to pass, working voltage rating may be exceeded.? Similar for the (National Semi?)
old plastic pill style transistors.? Had a bit of a time dating that power supply, was going to peg it around
1978 to 1980 based on component and wiring styles.? But, I saw that one of the meters has a 0272
date code, translating to 2nd week of 1972 if the meter is original.

Ultimately it comes down to are you willing to stress the supply given its age by exceeding ratings that
are present on at least some of the components?? If it were me, that would be a NO until I can slowly
check it out.

I am quite curious, as to what is connected to the 6.3vac windings? Are they supplying the heater for
a valve rectifier?? If so, got a part number?

The meters are likely going to be a 50uA moving coil variety.? Have you considered scrapping the
internals, then retrofit with off the shelf variable Boost / Buck regulator supplied by a larger transformer,
possibly a 100w laptop power supply (20v @ 5A)?? I would think would be much tighter on output than a
supply that is 52 years old, despite its brethren (like 5002) having excellent characteristics.

~SD