GE-Powercall

Twist131

New Member
Nov 15, 2019
4
PA
Was hoping someone could help me out. I have a GE-Powercall sure currently in use on one of our first our vehicles. The siren is is working condition how ever the warble tone it’s self is not as higher pitched as most GE’s I’ve seen. Not sure if this is a resistor problem or not!
 

tsquale

Lifetime VIP Donor
Oct 12, 2010
10,511
Minnesota, USA
The pitch does sound off on that. A member here @MtnMan repairs sirens. Being that it is a Powercall, the Fierstein Brand (who took over Powercall rights and production) also repairs Powercalls.
 
Sep 16, 2018
119
Kentucky
The pitch does sound off on that. A member here @MtnMan repairs sirens. Being that it is a Powercall, the Fierstein Brand (who took over Powercall rights and production) also repairs Powercalls.
May sound crazy, by am a "process of elimination" person. The problem is the "sound" which is where your speaker comes in. Wouldn't hurt trying that first (swapping with a different speaker) before migrating up to the more expensive components.
 

MtnMan

Member
Dec 20, 2012
1,533
Eastern PA
The Power Call siren was designed to have customizable tones by substituting caps and resistors in the oscillator circuit. There's a page in the manual that describes ranges of values for R36, R41, C9 and C10.

So, it's possible that that your siren was intentionally modified, or it could just be a component that's drifted out of spec over the years.
 

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