Shure 444 vs. Johnson CM17K

[WA2ROC]

Are these two microphoniums related in any way?  I just picked up the CM17K and it has some sort of "amplifier" inside that doesn't seem to do anything, probably because it doesn't use a power source of any kind.

There is audio output from the mike cors into my scope, but the output remains constant no matter where the "volume control" is set. 

And "No", the output of the mike element isn't connected directly to the mike cord.

[Pete, WA2CWA]

See: http://cgi.ebay.com/Vintage-SHURE-Desk-mic-preamp-ham-radio-/320629941115

[WA2ROC]

Thanks Pete.  You never know what information you'll find on Flea-Bay.

I just bypassed the preamp since this mike will be used on either my Apache or the KT-390. 

This mike also has a replacement element, not marked in any way, and the base is labeled "Johnson".

Time will tell....

[WA2ROC]

Yep, I found that out quickly.  It's on the way back to the seller now.

Merry Christmas!