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Author Topic: Unknown Vintage Hybrid Ribbon/Condenser Tube Mic  (Read 2559 times)

Online bremusound

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  • Real Full Name: Dirk Alex
Unknown Vintage Hybrid 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!



« Last Edit: February 09, 2018, 01:28:58 pm by klaus »

Online 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

Online 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 ?

Offline 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.

Online 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.

Online bremusound

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Re: unknown vintage hybride ribbon/condenser tube mic
« Reply #5 on: February 09, 2018, 09:43:19 am »
Ok, i found out that it is Swiss made.  8)
Manufacturer was Jakob Bohli (JB) who made several studio microphones for the broadcasting corporations in Switzerland.

Infos (german) and pictures:

http://www.aaa-switzerland.ch/files/ansermet.pdf
http://www.schuepbach.org/verschiedenes/m_jb8cs.html

Still had no time to build a PSU....

« Last Edit: February 09, 2018, 12:02:39 pm by bremusound »