To be on topic, I can say that about ten years ago I restored two bottle microphones, CMV 3 and 5.
This post by member moamps sent me on an exciting journey last night into the history of the Neumann CMV3 microphone.
Of course I already knew this milestone in microphone history more or less, but what I didn't realise was that this microphone and its direct successors have formed a really extensive product universe.
The following document lists all(?) model variants (including capsules). It is interesting to note how many different types of tubes were used. From the original RE084k to various "Wehrmacht" tubes, but also EF12K, VF14, EC92, EF95, EF86, EF806s and ECC81 were used.
http://www.jogis-roehrenbude.de/Roe...Neumann-Mikro/Flasche/Uebersicht_Mikrofon.pdf
In the post-war model variants CMV 5a and 5B II, EF6, EF37 and even the
American 6J7 were used. This closes the circle to the original topic of this thread. I am really surprised about this turn of events and would be very pleased if someone had photographic evidence of this transatlantic union.
If you are interested, here is a set of really wonderful photos of the
Condensator
Mikrofon
Verstärker
3. Very detailed shots of a CMV3 in original condition. I think the technical details for this time period are really outstanding.
http://www.analog-service.com/mikrofon-neumann-telefunken-cmv3.html
further beautiful photos and info are here:
http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Neumann-Mikro/Flasche/Flasche.htm
PS: How the hell does this "Betriebsstandanzeiger" (operating status indicator) in the heating circuit work?