Siemens Sitral v275a / v275b / v275c - what's the difference?

[adamasnan]

Hi everyone, I wonder if someone knows the difference between the Siemens Sitral V275 a/b/c versions or summing amp?

Thanks!

Adam

 

[adamasnan]

was kindly sent this - it's something

 

[Michael Tibes]

As far as I remember there have been many different versions of that amplifier. One main aspect might be that the original V275 was a discrete circuit and later versions used an IC (probably an early opamp ?) in the gain stage.

Michael