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84B Restoration - update-Touchdown!
#10

I installed the new 8" cone from MAT Electronics, shimmed the voice coil and glued them all together using the Bob Andersen procedure noted in the first post. 

[Image: https://www.dropbox.com/s/d4juzrcm47xyb0....jpg?raw=1]

After it all dried and the speaker was reattached to the chassis, it was playing like a champ.  I'm not sure how long the repair will last but I'm thrilled its working as well as it is.  As Bob mentioned in his video, the MAT Electronics cone is almost a drop in fit except for a little trimming of the cone's outer edge and the height of the outer hump on the cone which is about 1/16" higher than the metal frame.  I'll use some stand offs so the cone doesn't hit the mounting board.

[Image: https://www.dropbox.com/s/3hbilrq8t8q59y....jpg?raw=1]

The chassis restoration was pretty straight forward with the usual bakelite caps, electrolytic restuff, and a few resistors.  The 3 resistors that were replaced are the blu/blk/red, red/yel/yel and the 1meg brn/blk/grn.  The wires routed to the speaker needed replacement as well. Here's the before and after(without power cord).

Before

[Image: https://www.dropbox.com/s/ruwv5ylzvyscaw....jpg?raw=1]
After
[Image: https://www.dropbox.com/s/da8a963ey0mpol....jpg?raw=1]

Touchdown! [Image: https://www.dropbox.com/s/7x6ls4dtjlaojq....jpg?raw=1]


Messages In This Thread
RE: 84B Restoration - need advice - by klondike98 - 10-09-2014, 02:30 PM
RE: 84B Restoration - need advice - by morzh - 10-09-2014, 03:11 PM
RE: 84B Restoration - need advice - by klondike98 - 10-11-2014, 12:00 PM
RE: 84B Restoration - need advice - by klondike98 - 10-13-2014, 09:57 PM
RE: 84B Restoration - need advice - by morzh - 10-13-2014, 10:10 PM
RE: 84B Restoration - need advice - by klondike98 - 10-13-2014, 10:45 PM
RE: 84B Restoration - need advice - by klondike98 - 10-21-2014, 04:43 PM



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