Old version Video
Old Version VacTubAmp. Vacuum tube amplifier with EL34
VacuTub2 In progress, project name VacuTub2306. 2.Push-Pull ultra linear vacuum tube amplifier
Two (four) power vacuum tubes (JJ Electronic 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
Super linear tap 50W push-pull output transformer
5000 Ohm 50W
Measured waveforms (JJ Electronic EL34). Project commissioning
| Input signal (Ch1) 2.5V Output signal 20V (cca 50W/8 Ohm) File 0_1 |
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Input signal (Ch1) 0.6V 1kHz Output signal 6.4V (cca 5W/8 Ohm) The Rezistor R1 in the centre Feedback is not engaged !!! All other measurements for this level |
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| On the rezistor R41 (Ch1) On the rezistor R43 (Ch2) File 1 |
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On the grid EL2/2 (Ch1) On the grid EL2/7 (Ch2) File 3 |
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