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Klangfilm KL V502 amp
           
    Klangfilm Siemens KLV502 V502 KL V502 KL-V502 EL34 Push Pull Amplifer tube amp Röhrenverstärker tube classics  

  The picture shows a pair of Kl V 502 amps in the Eurodyn rack with their control unit, the Kl VZ 502a. The unit at the bottom is a Kl Q 509 rectifier for the tone lamp.

  The Kl VZ502a allows to check the tubes and the input signal and to adjust the lines voltage to 200V AC which was the original supply voltage for the amps (they have also windings for 125V, 220, 230 and 250V).

  Regarding the input sensitivity and the tone controls, the 502 amp is an integrated amp. When used as power amp, the first ECC40 tube is unnecessary and the input signal can be fed directly into the second ECC40's input grid. Please be aware that a coupling cap is needed when doing this.

 
   

2x KLV502 in Rack

     
           
   

 

  The quality. Oh my god. Watch the pictures. 5 big MPs for the power supply. I have nothing more to say.

  Great transformers. All parts are oversized The input transformer sounds very nice, too.

  Oh yes - the sound. The best EL34 amp I've heard? There is nothing to modify on this amp.

  If 12 watts are enough for your speakers (and it should be enough), convert the tetrode connection of the EL34s to triode operation. I use a 15 Ohms resistor to connect the screen grids to the plates.

 
   

inside view from below

     
           
     

Here are some typical test results:

(lines voltage= 220,5V on the 220V winding)

- B+ on GZ34 = 423V

- Plate voltage = 383V / screen = 373V

- catode of EL34 = 24.5V (22V as triode)

- power output = 28 watts RMS / 15 Ohms

  12-13 watts RMS in triode mode

- best (linear) frequency response with

  equalizer set to: bass=2 - treble=5

 
           
 

 

 
           

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