by TomMcNally » Sun Dec 10, 2017 3:37 pm
Translation that was with the schematic:
This simple tube amplifier uses ECL (parallel) or PCL (serial) tubes, a combination of triodes and end pentodes. Tubes such as PCL82, PCL84, PCL85, PCL86, ECL82, ECL84 and ECL86 can be used. I used a PCL82 tube with 16V ohm 0.3A and an anode loss of max. 7W. The amplifier is powered by a grid-shaped transformer with a glow voltage selected according to the tubes (for me 16V 0.6A). The anode voltage of the tubes is not critical, it can be about 100 - 200V according to the required power. Higher voltages will allow for greater power, but the tubes will be loaded with greater anode loss and current, which will cause faster wear. Filtration with two 100uF capacitors separated by resistors is necessary for better removal of the abdomen. The 22uF capacitor is an additional voltage filter for the pre-amplification stage that is the most sensitive to ripple. The speakers are connected via the output port. At the input is a stereo (double) logarithmic potentiometer for volume control.
Attention! There is a dangerous voltage in the amplifier! Before handling, always disconnect it from the mains and make sure the capacitors are discharged.
*** not sure why you'd remove the abdomen ???
... tom