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I have a K40-8. Been running it for years, it refuses to die. I had a couple solder joints repaired over the years. It was an E-bay find. About 10 years ago DTB radio did the peak and tune. The speech processor board has its own adjustments. I have been using an ST65DX noise canceling mic from Sparky's. The mic is a copy of RK56 that Sparky's did and he tried to get the mic element copied. Anyway, that's history and the important thing is that the radio sounds great. If I remember right Dave at DTB has the Sam's for the K40 CBs. If you tune it with a noise canceling mic then keep using that mic. Like Handy Andy noted the speech processor board has a mic pre-amp adjustment. When I tried a regular coffin mic is sounded over driven. The mic combination with the K40 speech processor produces a sound that seems like a lot more radio than it is in actuality.

<blockquote data-quote="secret squirrel" data-source="post: 740018" data-attributes="member: 7990"><p>I have a K40-8.&nbsp; Been running it for years, it refuses to die.&nbsp; I had a couple solder joints repaired over the years.&nbsp; It was an E-bay find.&nbsp; About 10 years ago DTB radio did the peak and tune.&nbsp; The speech processor board has its own adjustments.&nbsp; I have been using an ST65DX noise canceling mic from Sparky&#039;s.&nbsp; The mic is a copy of RK56 that Sparky&#039;s did and he tried to get the mic element copied.&nbsp; Anyway, that&#039;s history and the important thing is that the radio sounds great.&nbsp; If I remember right Dave at DTB has the Sam&#039;s for the K40 CBs.&nbsp; If you tune it with a noise canceling mic then keep using that mic.&nbsp; Like Handy Andy noted the speech processor board has a mic pre-amp adjustment.&nbsp; When I tried a regular coffin mic is sounded over driven.&nbsp;&nbsp; The mic combination with the K40 speech processor produces a sound that seems like a lot more radio than it is in actuality.</p></blockquote><p></p>

[QUOTE="secret squirrel, post: 740018, member: 7990"] I have a K40-8. Been running it for years, it refuses to die. I had a couple solder joints repaired over the years. It was an E-bay find. About 10 years ago DTB radio did the peak and tune. The speech processor board has its own adjustments. I have been using an ST65DX noise canceling mic from Sparky's. The mic is a copy of RK56 that Sparky's did and he tried to get the mic element copied. Anyway, that's history and the important thing is that the radio sounds great. If I remember right Dave at DTB has the Sam's for the K40 CBs. If you tune it with a noise canceling mic then keep using that mic. Like Handy Andy noted the speech processor board has a mic pre-amp adjustment. When I tried a regular coffin mic is sounded over driven. The mic combination with the K40 speech processor produces a sound that seems like a lot more radio than it is in actuality. [/QUOTE]

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