10-21-2014, 03:43 PM
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]
[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]
