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Author Topic: Electro-Voice 600C Mic.  (Read 2124 times)
9A7PJT
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Posts: 31


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« on: March 15, 2014, 07:42:56 AM »

  Hy,

I have this mic. from WW II, as new but I do not know almost nothing about him  Huh? I'd use it to 144Mhz. all mode radio. . .
  Does it worth it and if anyone had its specifications?

TNX & 73                                                                                                                                  73 PJT



http://www.flickr.com/photos/tonkojursky/sets/72157642382486155/
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G3RZP
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Posts: 4713




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« Reply #1 on: March 15, 2014, 11:48:59 AM »

My father had one, and I may even still have it around somewhere. What its characteristics are, I don't know, but you can do some simple tests. It could be a carbon microphone: if you shake it gently, can you hear something like a small tin of sand does when its shaken? If so, it's a carbon microphone. If not, you need to open it and put an ohm-meter across the microphone capsule, because it is either moving coil and you want to know if the capsule is open circuit and its approximate resistance, or if it's a crystal, after all these years, it will be useless anyway.

If it's moving coil, then figure out the connections and try it.

I have a feeling my father had to change the capsule in his, but as I don't know where it is and he's been a SK for 40 years, I can't help much further.
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W9GB
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Posts: 2624




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« Reply #2 on: March 15, 2014, 01:34:49 PM »

United States Army
DEPOT MAINTENANCE MANUAL
MICROPHONES T-30, T-46, T-50, M-29/U, AND M-80(*)/GR
http://www.liberatedmanuals.com/TM-11-5965-268-50.pdf

The US Army referred to the Electro-Voice 600C microphone as the T-50
This is a CARBON microphone -- used in Telephone circuits OR
Radios (military, aviation) designed for Carbon microphones.

Electro-Voice Aviation catalog page
http://www.electrovoice.com/downloadfile.php?i=970533

Carbon microphones (like your analog land-line telephone, POTS) require
DC Voltage to operate properly.
« Last Edit: March 15, 2014, 01:45:47 PM by W9GB » Logged
9A7PJT
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Posts: 31


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« Reply #3 on: March 15, 2014, 02:21:06 PM »

 O.K.

TNX for INFO , but in this pages  say -  No Power needed - Shocked  ?

http://www.radiomuseum.org/r/electro_vo_carbon_microphone_50.html


                                                                                                     73 PJT

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G3RZP
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« Reply #4 on: March 15, 2014, 04:08:39 PM »

A carbon mike DOES need a biasing current. That must be why my father changed the insert......

Plus the speech quality isn't always of the best, although the double current carbons were far better than the single button ones..

Aircraft communications always seem to me to be mainly distortion anyway.....
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KD0REQ
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Posts: 971




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« Reply #5 on: March 18, 2014, 05:22:52 PM »

EV had a 600 dynamic into the 60s, you had to order it either high or low impedance.  I had one surplus from the TV station, and ended up wiring it to a arena noise splitter for the booth positions in 1979 when I did the sound for the hockey arena in Devils Lake.  3 pin Amphenol plug.
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