These preamps are very, very nice. They need an external power supply or can be powered by a Siemens power amp.

  Unfortunetaly none of them has a real RIAA phono stage, but it is not too complicated to get them upgraded this way.

Comment

6SELA

2117

EF40

EF40

EF40

  First 1950s version of these amps. Box shielded input transformer for the symmetrical microphone input.

6SELA

2117

EF40

EF40

EF40

  Very early 1950s version of these amps. Only one T41 input transformer for the symmetrical microphone input.

6SELA

2139

EF40

EF40

EF40

EF40

  Pretty similar to the above preamp. 1 additional microphone input leads to a pair of T41 input transformers.

6SELA 2145

EF40

EF40

EF40

ECC81

  Rare version. The last one using the classic EF40 tubes and the first one having a cathode follower output stage with 600 Ohms output transformer of very high quality.

  Something like the deluxe version of the 2139 preamp.

6SELA

2154

EF86

EF86

ECC83

ECC83

  Last version of the tube equipped preamps from Siemens. The EF86s substituted the EF40s. Cathode follower output stage with 600 Ohms output transformer of very high quality.

  Also found with ECC81 output tubes

  A limiter with transformer could be installed if needed (cutout provided).