Here is what I see. The tripler is OEM. The date code ( 7314 ) puts
it in the range of the set being born with it. It also looks very clean.
Often they discolor or swell up when stressed by HV problems.
BTW did you change the hoz out. Its not original. There is a low ohm,
1.5 ohm IIRC & a 'lytic in the base circuit. The resistor should be a carbon or another non wire wound.
73 Zeno
LFOD !