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model 84 speaker replacement
fenbach
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Posts: 138
Threads: 27
Joined: Dec 2016
City: portland, OR
#4

09-23-2020, 04:24 PM
nice try falcon123, but i don't think an 84 is worth the cost of a full restoration, including a recone of the speaker and a new dial face at the least for this one. that said, the cabinet is in exceptionally good condition. no damage whatsoever [in case someone is interested].
but now i'm interested in knowing just how critical the speaker impedance is. would i even notice a difference in sound quality with a modern 4 ohm speaker? at my age, that is Icon_smile . and if it is an issue, could i fake it by just putting a resistor in parallel with the speaker?
then, speaking of the impedance, is a simple resistance reading anywhere close? and if not, at what frequency should i calculate the impedance? from the inductance, which i find by setting up a tank circuit. i "ping" the circuit thru a diode at a low frequency, read off the resonant frequency on an oscilloscope and compute the inductance.
(This post was last modified: 09-23-2020, 11:30 PM by fenbach.)
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Messages In This Thread
model 84 speaker replacement - by fenbach - 09-21-2020, 07:01 PM
RE: model 84 speaker replacement - by RodB - 09-21-2020, 07:41 PM
RE: model 84 speaker replacement - by falcon123 - 09-22-2020, 05:13 AM
RE: model 84 speaker replacement - by fenbach - 09-23-2020, 04:24 PM
RE: model 84 speaker replacement - by Radioroslyn - 09-23-2020, 05:33 PM
RE: model 84 speaker replacement - by falcon123 - 09-23-2020, 07:48 PM



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  1. The PHILCO Phorum
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