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Found a 38-690 today
FStephenMasek
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#16

04-18-2011, 01:34 PM
Mikhail7 Wrote:So, they're early "drone cones", sans voice & fieldcoils? My Altec 890C Bolero speakers each have a 10" speaker and a 10" "passive radiator".

Mike
They are different than those passive radiators in your speaker, as they are specifically intended to deal with vibrations from the wood cabinet. Here are two articles on them:

http://www.tuberadioland.com/philco38-116XX_main.html

scroll down on this site:
http://www.philcorepairbench.com/tips/svctip38.htm
Web site: http://www.masekconsulting.net
Radio Photos: http://www.photobucket.com - album id FStephenMasek
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Michael Dennis
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#17

04-18-2011, 01:38 PM
Thank you for the information. Always glad to learn something new.
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