Fisher sourced their tubes from Telefunken, Amperex, Mullard, ITE, and others. And they were branded THE FISHER, with a country of origin on them. All of your OUTPUT tubes are replacements. If you have "THE FISHER" small tubes in it, all of the 12AX7's I have from 2 consoles are Tele's, and the rest have "MADE IN Britain" on them. the 6HU8's are Marked "ITE for FISHER" on them. so basically if it doesn't say FISHER or THE FISHER on it, it's a replacement tube. Tele's will have a DIAMOND or SQUARE in the center bottom surrounded by the pins.
The 62 supposedly had a 460A/460T combo. 63's supposedly had the 490A/490T combo. the 64's supposedly had the 481A/590T combo. 65's had a 49A/49T combo. The 49A is a Hybrid Tube / transistor Amp with 4 TO-3's. the 59A in the FUTURA and AMBASSADOR is the same amp with 8 transistors with an associated increase in wattage from 50W IHF to 75W IHF. But FISHER was known to mix and match amp/tuner combinations to clear out inventory or introduce newer amps/tuners in the middle of a production run. So you can have a 480A/490T and still be correct.
Larry