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Siemens - Klangfilm

Introduction / Overview

Klangfilm History

Moving Coil MC preamps

KLV Eurodyn Rack Amps

KLV Preamps

Output Transformers
Speakers
Siemens 2000 Amps

6SELA Preamps

6SELA Power Amps

6SELA Tuners

Spare Parts

Typical Tubes

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Eugen Bauer

 
Stereo RIAA Line Pre Amp based on the 2154  
     

  This is the modification page.

  Click here to see the finished unit.

 
   

  The 6SELA preamps are very nice, but unfortunetaly they do not have a RIAA equalization for Phono and they are not too easy to handle (external power supply needed).

  So I decided to build a stereo preamp on a 2154 base.

  I achieved to re-use all original cables to the front plate and changed one pot for a pilot light and another one for the power switch (the two pots on the right).

  The I got from left to right:
- left volume - right volume - balance (works almost as switch) - input selector (off-phono-line) - power light - on/off switch.

  Of course the lettering of front panel needed to be changed then. But flipping it I found the back side looking good and so it is still the original panel which is installed.

  I used all parts from Siemens / Klangfilm (amps), except the output capacitors which are paper in oil types from Rohde & Schwarz.
Tubes / circuit design (per channel):
- EF86 (connected as triode) RIAA amplifier
- ECC83 section#1: line preamp
- ECC83 section#2: catode follower output

Features:
- Catode follower output stage for very low

  output impedance (uncritical to any cable)
- double mono volume control
- Phono MM input possible (just bridge the

  input transformers)
- famous Siemens / Haufe T41 input

  transformers
- all original 2154 plates included (also the

  very rare botton plate)
- gold plated RCA input and output jacks
- professionel symmetrical use with

  balanced i/o possible (cut 3 jumpers) 

 
       
  Siemens Klangfilm RIAA 2154-stereo Eurody rack design style Phono preamp    
       
  Siemens Klangfilm RIAA 2154-stereo Eurody rack design style Phono preamp    
         
  Siemens Klangfilm RIAA 2154-stereo Eurody rack design style Phono preamp  

 
         
   

 
         
  Siemens Klangfilm RIAA 2154-stereo Eurody rack design style Phono preamp  

 
         
 

 

 

 

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