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Pretty sure it's every bit of 45 years old. Fair chance that age is the cause of the trouble, and not some adjustment that's turned down too low.

You'll hear advice to "re-cap" a radio this old. The aluminum electrolytic capacitors just don't hold up that long. Don't know how many of those are in this model, but I'm pretty sure a handful of them are in the mike audio circuits.

Just one problem. You won't find out if that's gonna fix it until you have changed all two or three dozen of those parts.

An experienced pro could zero in on the cap that's causing a particular fault. And changing just "the one" cap that causes today's symptom leaves the rest of them to come up later on. We call that "electronic whack-a-mole".

Do you have a way to check the mike on another radio?

Or another mike on this radio?

73

<blockquote data-quote="nomadradio" data-source="post: 787691" data-attributes="member: 22">Pretty sure it&#039;s every bit of 45 years old. Fair chance that age is the cause of the trouble, and not some adjustment that&#039;s turned down too low. You&#039;ll hear advice to &quot;re-cap&quot; a radio this old. The aluminum electrolytic capacitors just don&#039;t hold up that long. Don&#039;t know how many of those are in this model, but I&#039;m pretty sure a handful of them are in the mike audio circuits. Just one problem. You won&#039;t find out if that&#039;s gonna fix it until you have changed all two or three dozen of those parts. An experienced pro could zero in on the cap that&#039;s causing a particular fault. And changing just &quot;the one&quot; cap that causes today&#039;s symptom leaves the rest of them to come up later on. We call that &quot;electronic whack-a-mole&quot;. Do you have a way to check the mike on another radio? Or another mike on this radio? 73</blockquote>

[QUOTE="nomadradio, post: 787691, member: 22"] Pretty sure it's every bit of 45 years old. Fair chance that age is the cause of the trouble, and not some adjustment that's turned down too low. You'll hear advice to "re-cap" a radio this old. The aluminum electrolytic capacitors just don't hold up that long. Don't know how many of those are in this model, but I'm pretty sure a handful of them are in the mike audio circuits. Just one problem. You won't find out if that's gonna fix it until you have changed all two or three dozen of those parts. An experienced pro could zero in on the cap that's causing a particular fault. And changing just "the one" cap that causes today's symptom leaves the rest of them to come up later on. We call that "electronic whack-a-mole". Do you have a way to check the mike on another radio? Or another mike on this radio? 73 [/QUOTE]

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