Motorola SK-29M Restoration

[stbasil]

My first random fix on this guy is the torn off speaker enclosure door, simple enough, actually, since it's due to the glue failing on the hinge side of the enclosure. While I was at it, I found that the inverted magnet oval midrange was completely white with what may be the dreaded cadmium dust. It came off easily with a wet paper towel, as did the same, very thick coating on the inside magnet cover. Both speakers ohmed good, fortunately.

The grille cloth is in decent shape except that it has shrunk upward on the bottom edge of the doors. They didn't wrap it around the speaker board on the top and bottom, so the only thing keeping it in place is glue, and there is not enough surface area below the midrange cutout to keep it secure when it started shrinking.

I can grip the cloth and with a lot of force manage pull it down, but it of course won't stay that way. I tried carefully heating with a hair dryer while pulling, but it won't keep it from shrinking back. Any suggestions on how to fix that, apart from replacing the grille cloth? I may just end up covering the exposed lower edge with some gold tape, but that doesn't fix the waviness.

[electra225]

Check AES to see what kind of grille cloth they have. I used a cloth very similar to that on that old GE stereo I redid, had a touch more red in it, but yours has shrunken and faded. Does that cabinet show signs of being wet? PB Blaster works well on the cad dust. Spritz some on a paper towel, wipe, and the cad dust seems to stay away.

That 6X9 speaker has a 232 EIA code on it. Magnavox!

[stbasil]

Uploaded Sam's SK-29M service manual, and also a single page schematic from 1960 Beitman's, to the Uploads Amps and Tuners section. Neither of those have a tuner schematic.

[electra225]

Thank you!!

[William]

It is weird not seeing the magnet in the normal spot, and this is the first time ever seeing a speaker like that, thank you for sharing that photo.

Bill

[electra225]

Antique Electronic Supply is now called Amplified Parts. They have quite the selection of grille cloth. Hopefully, you can find something close that will work.

https://www.amplifiedparts.com/products ... lex-piping