Old version Video

Old Version VacTubAmp. Vacuum tube amplifier with EL34

VacuTub2 In progress. 2.Push-Pull ultra linear vacuum tube amplifier

Two (four) power vacuum tubes (EL34) are used to amplify phase-inverted copies of the same signal..

The output power depends on the output transformer, only the recommended current and voltage values ​​for the EL34 anode are allowed !!! 

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Example of wiring diagram

PCB

Wiring PCB

Example of a functional Implemented amplifier

Bill of materials (Some resistors depend on the parameters of the tubes)
changes in the values ​​of the components
Component Old value New value
Trimer R16 10k 22k
Resistor R18 18k to trimer 10k (position cca 2k7)

Bill of materials

Measured waveforms. Project commissioning

On the rezistor R41 (Ch1)
On the rezistor R42 (Ch2)
File 0		 On the grid EL2/2 (Ch1)
On the grid EL2/7 (Ch2)
File 1
Input signal (Ch2) 1.12V
On the rezistor R22 (Ch1 x10)
File 22_1		 Input signal (Ch2) 3.12V
On the rezistor R22 (Ch1 x10)
File 22_2
On the grid EL1/7 (Ch1)
On the grid EL1/2 (Ch2)
File 2		 On the grid EL3/5 (Ch1)
On the grid EL5/5 (Ch2)
File 3
Input signal (Ch1)
On the anode EL5/3 (Ch2),
without the Boucherot cell,
CH2 x10
File 5		 Input signal (Ch1)
On the anode EL3/3 (Ch2)
without the Boucherot cell
CH2 x10
File 6
Input signal (Ch2)
Output signal from
the transformer (4 Ohm)
with the Boucherot cell
File 4		 Other tubes:
EL3/3 EL5/3 (Ch1)
Used old EL34
cca Ia=50mA,S=7
Input signal (Ch2)
File 7
Input signal (Ch2)
Output signal 10kHz from
the transformer (16 Ohm)
without the Boucherot cell
File 10k		 Input signal (Ch2)
Output signal 18kHz from
the transformer (16 Ohm)
without the Boucherot cell
File 18k