I converted an MLA2500 to a single 3CX800A7 some years ago, and it works fine.
If I was doing it again I think I would probably use a pair of GI7Bs which are
much cheaper.
I don't think you need an extra filament transformer - the existing transformer
has a 12V 4A winding which is plenty. (As others have mentioned, the voltage
will probably be too high and a series resistor is called for.) The 6V winding
can then have a voltage doubler on it to supply relays and and LEDs.
73 Roger
VE3ZI
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