[Chas]

Dan,

I forgot to add a warning, mineral spirits are hazardous, use in an open area as well as acetone. Wear nitrile gloves but these will give way with acetone. Beware of fumes creeping to a source of ignition, like the hot water heater of the oven pilot.

Keep the solvents off the skin, all the times...

BTW my hot water heater gave out some 10 days ago, I got some 20 years out of it but what happens the firebox draws in solvent fumes. It does not explode but the flame converts solvent fumes to acids that eat the bottom of the tank

There are a lot of details I had to work out with common tools to repair speakers. One has to apply some two steps ahead to work out how to accomplish the task of speaker repair.

IMHO the original speaker will always sound the best, though some may argue the "hard" cones of the early Philcos rather tinny. There is good reason. Lower tones from a new speaker will cause more vibration to tube elements and possible mechanical oscillations... The other benefit is the ideal filtering of the field coil as a choke.

GL

Chas