I am restoring my HQ-129X and notice the RF amp is a 6SG7 instead of the normal 6SS7. Looks like the socket has been rewired because of the shiny solder and slightly burnt insulation on some terminals. Is this a worthy upgrade or should I restore to the 6SS7? I'm leaning to return the 6SS7 for purity. Help bob...w2ami Wanted dead or alive.