[Michael Dennis]

The differences are in the Service Bulletin supplements. Sometimes there are just component changes. Sometimes a wiring change to accommodate a tube type change, usually the rectifier or audio output tube, or a combo, etc.

I provide these Code variations, when applicable, as part of the photocopy service packets explained on my site. Most current on-line sources for Philco schematic info do not include all this info Philco published.

Yes, I've noticed that. Chuck, you da man and thanks for providing complete info that others don't! Seems rectifier and audio output tubes are usually the pricier ones of late. I've heard some say that the audiophiles are responsible for the dearness of the output tubes because they're willing to pay premium for them and most tube suppliers know that. Dunno, but that seems to be the conventional wisdom taken by and large. I never thought type 80's, 5Y4's, 42's, 6V6's, 6L6's and 45's especially would tend to cost so much. Having said that I have to admit some sources are seemingly significantly more reasonable than others. Sorry, Mikey's rambling again. Hey, how can I have (2) posts # 113? Is that lucky? What do I win? Ok, I know, the lovely Sterling silver tea service and a night on the town with Jack Kervorkian...

Best Regards. Still no score, Fightin' Amish vs. Quaker State.

Mike