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Author Topic: unknown vintage hybride ribbon/condenser tube mic  (Read 795 times)

bremusound

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unknown vintage hybride ribbon/condenser tube mic
« on: November 03, 2016, 11:25:11 am »

Hi,

recently a nice pair of unknown vintage microphones came into my hands.
These were probably the first (sorry Mr Fouxman...) hybride ribbon/condenser mics ever made.
An omni condenser capsule is sitting underneath a ribbon motor. You can switch between omni, cardioid and fig-8.
They have a Raytheon 5703 tube inside and two trannies, BV51 and BV56. More pics of parts can be made.
Unfortunately i do not have a PSU...

Please have a look at the pictures. Does anyone have any idea about who was the manufacturer of these?
They only say 'JB 8CS'??

Thanks for your interest!



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bremusound

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Re: unknown vintage hybride ribbon/condenser tube mic
« Reply #1 on: November 03, 2016, 12:02:16 pm »

two more pictures
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bremusound

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Re: unknown vintage hybride ribbon/condenser tube mic
« Reply #2 on: November 04, 2016, 10:24:19 am »

Maybe they are from Switzerland or France? Condensateurs Fribourg... 8CS could mean 8-Cardioide-Spherique ?
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Michael O.

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Re: unknown vintage hybride ribbon/condenser tube mic
« Reply #3 on: November 05, 2016, 09:05:45 pm »

Fwiw, the labeling reminds me of how Sennheiser labeled/relabeled some mics (an example), and the bv-XX transformer nomenclature is typical of German microphones. However, German mics from that era tended to use German components as well (for example, Siemens capacitors). This is a novel microphone with pattern switching not unlike the Western Electric/Altec 639a/b, but substituting a condenser capsule for the dynamic diaphragm.

bremusound

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Re: unknown vintage hybride ribbon/condenser tube mic
« Reply #4 on: February 22, 2017, 04:41:26 am »

The connector seems to be the same 5-pin that was used in the CMV3 and CM7151, but fixed with a kind of bayonet instead of a threaded junction ... seems to be made in Germany.
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