El34 push pull amplifier pdf

If youre interested with classic circuit and classic components, then you should try this circuit. Its deep as the internal hell, clear like tuned piano and makes a world of difference to enjoying music. They distort more smoothly than an el34, but you have to push them more. Especially striking is the large outputpower capability of the superpentode circuit 5, delivering up to an unusual 80w with only two el34 tubes. Very few designs differing from these two have proven fit for real life, the quad ii being a notable exception you will find the diagram in the appendix together with a brief explanation. At this point, we assume the amplifier to be adjusted is a class ab pushpull amp. A push pull valve amplifier almost invariably follows one of the two schemes shown in block diagrams below. A soft start circuit for the filaments and a delay on the high voltage. The amplifier circuit shown uses the dynaco a420 audio output. Mullard pushpull vacuum tube amplifier scheamtic using dynaco audio output transformers. Certain assumptions may be made as long as the power output of an amp is known. A 50 watt amp with two 6l6 or el34 tubes, or a 100 watt amp with four 6l6 or el34s, is a push pull amp. It is intended for audio frequency power amplification service in either pentode, ultralinear or triode connection and single or push pull parallel applications.

It easy to consider two el34 better than one kt88 or one 6550 because with two. It have to be experienced as a description is far from enough compared to feeling it in your chest. Class ab is another type of push pull amplifier which is almost similar to that of a class a push pull amplifier and the only difference is that the value of biasing resistors r1 and r2 are so selected that the transistors are biased just at the cut in voltage 0. Pp2010 hiend push pull amplifier audio design guide. This is the circuit diagram of 35w tube power amplifier with el34. The main problem of pushpull amplifier is the not perfect distortion decay with the. An easily constructed highquality singleended 8w amplifier. A easy to make 30 watt stereo tube amplifier that uses claus byrith optimized design of a. This tube amplifier designed in 1953 and worked from 1954 until 1989. Dc circuitcircuit diagramelectronic circuit projectselectronics basics. A 50 watt amp with two 6l6 or el34 tubes, or a 100 watt amp with four 6l6 or el34s, is a pushpull. This is hi quality amplifier based on dynaco ultra linear push pull. The circuit is interesting but i think it is hard to find the tubes.

Mullard el34 pushpull tube amp schema avec dynacoa420. In general, higherpower amps are usually push pull class ab circuits, while lowpower amps are usually pure class a. The largest difference from the transistor amplifier to the el34 tube amplifier is the bass. El34 6ca7 high performance audio power pentode he svetlana el34 is a glass envelope power pentode having a plate dissipation rating of 25 watts with convection cooling. Standardized designs after the 50s, the growth of new ideas in tube amplifier circuitry declined, and standardized designs became generally accepted, such as the lafayette 2 x el84 6bq8 push pull power amplifiers in pentode mode with a. It is enough where you could use the amp in a club, but with the classictone 8k you couldnt get into the amps wheelhouse without earbleeding and i dont like to use attenuators or master volumes when playing live.