Siemens

[Michael Tibes]

U273S

 

[Michael Tibes]

V282a

 

[etheory]

Siemens U274 input and output transformer info.
Measured using an LCR40 meter (yes, it was at 1kHz, but it's the only equipment I have). Useful for reference:

 

[nashkato]

siemens 2275 MV , Mischverstärker
summing amp

 

[MattGray]

Siemens/AUSO ELA 75-75 Compressor/Limiter/Expander - Converted/translated from Italian to English.

 

[gyraf]

Siemens U273-A

 

[ToBSn]

Siemens V-72