Neumann M50 - history
- Thread starter lampas
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I would really don't pay attention to the stories about "problems with electricity" 
"The project began in 1948 and these ones were manufactured as prototypes in 1950."
That's funny because these schematics from 1950 are updates for circuits from 1947
Motivations of designers could be very different.
For me it looks like it was designed in the spirit of CMV5/B.
VF14 rather couldn't be used with common voltage for B+ and heaters, because there's completely no space inside the body for heat dissipation and making seperate high voltage heaters would be non profitable (i think).
They probably didn't know these days all the urban legends related to VF14, all these stories started ca. 50 years after
Tube rectifier, hmm... Could be lower noise than selenium or silicon rectifier. Higher resistance causing voltage drop (selenium also, so hmm...). Don't know how fluctuations looks in comparison, but definately it wasn't regulated psu.
Tube recitifiers also works a little bit as a "soft start" so maybe that was the reason? Or designer could be old prick which prefered tube rectifiers over selenium or silicon
90V of polarisation voltage! This one probably was low noise
Neumann M50 capsule is really different. Diaphragm is more outside the sphere, irt version is much more hidden inside after mesh. This could affect response a little.
One thing is strange to me. PSU!
Are you sure that it's proper unit for these microphones? It looks strange, really strange.
Pinout for PSU is different than microphone pinout. Inside PSU is exactly the same output transformer as in microphone for now i could only speculate its function. "RK" - "K" for calibration?
Definately i would be interested in manual
"The project began in 1948 and these ones were manufactured as prototypes in 1950."
That's funny because these schematics from 1950 are updates for circuits from 1947
Motivations of designers could be very different.
For me it looks like it was designed in the spirit of CMV5/B.
VF14 rather couldn't be used with common voltage for B+ and heaters, because there's completely no space inside the body for heat dissipation and making seperate high voltage heaters would be non profitable (i think).
They probably didn't know these days all the urban legends related to VF14, all these stories started ca. 50 years after
Tube rectifier, hmm... Could be lower noise than selenium or silicon rectifier. Higher resistance causing voltage drop (selenium also, so hmm...). Don't know how fluctuations looks in comparison, but definately it wasn't regulated psu.
Tube recitifiers also works a little bit as a "soft start" so maybe that was the reason? Or designer could be old prick which prefered tube rectifiers over selenium or silicon
90V of polarisation voltage! This one probably was low noise
Neumann M50 capsule is really different. Diaphragm is more outside the sphere, irt version is much more hidden inside after mesh. This could affect response a little.
One thing is strange to me. PSU!
Are you sure that it's proper unit for these microphones? It looks strange, really strange.
Pinout for PSU is different than microphone pinout. Inside PSU is exactly the same output transformer as in microphone for now i could only speculate its function. "RK" - "K" for calibration?
Definately i would be interested in manual
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