neumann v475 pimping ...

[aleev]

Thank you!!! And what about 286/3? Is it 1:1 too?
I need the transformer for my Audiolab 8200q preamp.

 

[aleev]

 

[zzzzz]

going to be working on a V475-2B that I bought years ago soon and will probably report in here if I have issues lol. measured the Harting connector pinout for 0v / ground continuity and here's what I ended up with, in case this is useful to anyone.

also attached higher res V475-2B schematic and V475-2A service manual (original German, searchable thanks to Acrobat and then a messy Google Translated version to English... you need to copy-and-paste the text out of it)

CONNECTION NOTES:

• Channel 1 power supply "0V" (pins C14 and C16) do not share continuity with Channel 2 power supply "0V" pins C18 and C20
  
  
• +24V input pins for Channel 1 (pins A14 and A16) do not share continuity with +24V input pins for Channel 2 (pins A18 and A20). Any reason for this?
  
  
• Channel 1 "0V" ref does not connect to Chassis Ground / earth, BUT the Channel 2 "0V" ref does connect to Chassis Ground: all metal bolt holes and also the metal plate that runs down the middle of the card.
  
  
• ALL Channel 1 (input and output signal AND power supply) "0V" pins share continuity with each other. This "0V" ref is also tied to the transformer shield on Channel 1.
  • Ch.1 "0V" pins sharing continuity are A6, A10, C6, C10, C14, and C16.
• ALL Channel 2 (input and output signal AND power supply) "0V" pins share continuity with each other. This "0V" ref is also tied to the transformer shield on Channel 2.
  • As mentioned, all Channel 2 "0V" connections are also tied to Chassis Ground.
  • Ch.2 "0V" pins sharing continuity are A24, A28, C18, C20, C24, and C28.

 

[Polykobol]

Hello,
I am interested into building some summing busses with these Neumanns 475 2c for my API modules for the returns effects.
I would like to know where could I find the built in recommendations in order to select the value of the input resistors for a 16 channels inputs for exemple. And Principally, I am interested in order to get everything interesting to build this summing.
Could you please tell me where to find these informations?
Best Regards,
Francois

 

[Polykobol]

…and another one,here you can see the resistors directly mounted on the SIEMENS plugs,the relays board etc.

Hi Kante1603, I notice you are from Munich. Well, I work in Munich and live "not that far". I am interested to build 2 summing to create busses for my home built "custom console". I am interested to know how to define the resistor value for a 16 inputs solution... Could you please help me? Grüß, Francois

 

[Polykobol]

Hi Steph,

I don't see any advantage in replacing the op amps.
the V475 is great like it is!
it won't be better with other op amps.

Hi, may be an API 2520?