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Joined: Dec 2009
City: Roslyn Pa
The cone/vc are the same but you may have some trouble getting it off of the frame. After 90+ yrs they get stuck to the cardboard ring and all most glued to the frame. Have had some just pop off and other that I had to cut off with a sharp knife. The folds near the outside edge tend to fails, paper just fall apart requiring a new cone. On these they are 10 1/2" so you have to use a 10" cone a make a spacer to fill in the gap between the cone and frame.
When you have it apart do clean the dust from it and the gap (the area were the vc fits down in to). Dirt gets in there and restricts the vc movement deminising the speaker's frequencies response.
I just got done servicing speakers in a 21B,70B, & 90B v2. All got new cones and cords.
GL
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
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RE: Philco 90 1-47 Triode - by Radioroslyn - 12-22-2023, 12:34 AM
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