Discussion about products such as Model 26 Fire Station Alerting, IPFSA, Zetron MAX, and other products made by Zetron.
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Our station has a Wheelock TPA-100-B PA amp for overhead telephone paging and monitor receiver. R 20 is burned. If you have one of these amps, will you remove top cover and give me the color bands on R 20 on the power supply board. Model TPA-60-B might have the same resistor.