My quick refurbishing of our DCM TF350 Speakers. My goal was to save the originals as much as possible.
I only replaced the electrolytic caps since they were over 25 years old. The surrounds had died more
than five years ago. I forgot how laid back these speakers sound; It is a real pleasure to listen to them again.
New foam surrounds and electrolytic 47µF caps. Total cost about $35 [$25 surrounds, $10 caps]
Parts Suppliers: Simply Speakers & Parts Express
I did have to modify the inside lower area of the gasket. When placed in the basket with the new foam
surround it pushed on the foam and distorted its shape. A little dremel work to shave away a chamfer
on that inner edge to prevent the gasket from interfering with the movement of the foam surround.
The dark area on the cone is from the application of too much alcohol when softening the original
adhesive. It pulled the black adhesive down then promptly dried. It is behind the grill cloth so
there is no harm visually.
Foam Surround glued to paper cone
Grill cloth rolled down exposing crossover
Crossover rear
(Notice the hand drawn traces and sloppy soldering by DCM)
Crossover top
(Notice the copper tube glued in the center of the inductor by DCM)
(Notice the new 47µF cap installed)
(Black/Red Woofer, Green/White Tweeter)
Remounted driver
Finished refurbish with original grill cloth
Schematic for DCM TF350
I only replaced the electrolytic caps since they were over 25 years old. The surrounds had died more
than five years ago. I forgot how laid back these speakers sound; It is a real pleasure to listen to them again.
New foam surrounds and electrolytic 47µF caps. Total cost about $35 [$25 surrounds, $10 caps]
Parts Suppliers: Simply Speakers & Parts Express
I did have to modify the inside lower area of the gasket. When placed in the basket with the new foam
surround it pushed on the foam and distorted its shape. A little dremel work to shave away a chamfer
on that inner edge to prevent the gasket from interfering with the movement of the foam surround.
The dark area on the cone is from the application of too much alcohol when softening the original
adhesive. It pulled the black adhesive down then promptly dried. It is behind the grill cloth so
there is no harm visually.
Foam Surround glued to paper cone
An externally hosted image should be here but it was not working when we last tested it.
Grill cloth rolled down exposing crossover
An externally hosted image should be here but it was not working when we last tested it.
Crossover rear
(Notice the hand drawn traces and sloppy soldering by DCM)
An externally hosted image should be here but it was not working when we last tested it.
Crossover top
(Notice the copper tube glued in the center of the inductor by DCM)
(Notice the new 47µF cap installed)
(Black/Red Woofer, Green/White Tweeter)
An externally hosted image should be here but it was not working when we last tested it.
Remounted driver
An externally hosted image should be here but it was not working when we last tested it.
Finished refurbish with original grill cloth
An externally hosted image should be here but it was not working when we last tested it.
Schematic for DCM TF350
An externally hosted image should be here but it was not working when we last tested it.
Last edited:
Been testing the speakers and they sound like they used to sound. Very mellow
and laid back. Most modern speakers are so forward in recent years. No voice
coil scratching (my biggest fear). Saved the original grill cloths. So the project
was a success. I hope anyone else attempting to restore these types of speakers
benefits from this thread. On to the Rotel RB850 Restore project!
and laid back. Most modern speakers are so forward in recent years. No voice
coil scratching (my biggest fear). Saved the original grill cloths. So the project
was a success. I hope anyone else attempting to restore these types of speakers
benefits from this thread. On to the Rotel RB850 Restore project!
Last edited:
