Ceska verze

Vacuum tube preamplifier

     Here I present a simple one-valve involvement stereo preamplifier with dual triode vacuum tube. Any twin triode with separate cathodes designed for amplifying audio signals can be used, such as: 6CC41, ECC82, ECC83, ECC802S, ECC803S or 6CC10. Heater winding should be chosen for a particular typeof tube. If the heating filament coil gives a little more voltage than is needed, it can be reduced using resistor. This kind of supply is also more friendly to the tube, it will not suffer such a large inrush after switching on. Anode winding should have a voltage 30 - 50V. Doubler is used, because a lower voltage transformers are more accessible. The resulting anode voltage will be approximately 80 - 130V. Improved power supply filtration is assured by pi filter. If even there was a hum, you can add one more filtration step (Another 4k7 resistor and 47u capacitor).

     Warning! Amplifier supply voltage is dangerous! Prior to manipulation, it is always necessary to disconnect from the network and make sure that the capacitors are discharged.

Schematic of the vacuum tube preamp with dual triode
Schematic of the vacuum tube preamp with dual triode

PCB board of the tube preamplifier with noval socket
PCB board of the tube preamplifier with noval socket

PCB from downside with the socket soldered
PCB from downside with the socket soldered

 soldering parts to the board
soldering parts to the board

PCB with tube ECC83 (TESLA)
PCB with tube ECC83 (TESLA)

Completed DPS
Completed DPS

Working tube preamp with heater glow visible
Working tube preamp with heater glow visible

 Working tube preamp with heater glow visible


Putting it into box
Putting it into box



home