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Joined: Sep 2006
Posts: 3,290
Member
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Member
Joined: Sep 2006
Posts: 3,290 |
To add to the correct suggestions: open the A battery (Talk) supply, and listen for the hum. If it hums, you can add a 1000mfd electrolytic filter capacitor on the output leads. Observe polarity.
If the supply is not the problem, you must isolate each T&R and test for a metallic problem, until you find the offending wire.
Are you familiar with telephone testing procedures and tools? If not, someone can walk you through the procedure. The power supplies, and intercoms and others like it are often available on the E-place.
Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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