Dating silverface vibrolux
(.00 additional at that time) Always pull on the volume controls to see if they pull out-these were pull boosts, not labeled on 70’s faceplates.
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I use this before buying a amp always-check all four transformers-will tell you if there has been problems along the way. On the bottom lower corner of the grill cloth was/is a 1×2 inch “JBL” plastic logo that Fender attached.
Its in the middle of the 6 preamp tubes with the removable shields. For a black face, this transformer would have been made in 1964 during the 23 week (—423) The trick to this is they don’t renumber the decades.In addition, the bias circuit will be converted to a standard blackface type that allows for precise adjustment without pulling the amp chassis.This saves time and money on future output tube replacements.For most Silverface amps not built in the above time period, you still get the bias adjustment mod but the other changes will be a bit subtler.Basically, the tone will get a bit more harmonic, very slightly more distorted in a good way and bass will be reduced slightly.
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These circuit changes fixed the instability but adversely affected the tone of the amp.