If you attach a transformer with UL to the output, you can make a small but good amplifier.
The UL connection is generally said to have an NFB of about -3dB, and it is possible to raise the DF of the Pentode.Įven with a 2-stage NFB like this circuit, the DF can be set to 2 or more. The transformer at the time of production did not have an SG tap for UL. If possible, it would be better to use a transformer with a tap as the output transformer and use it as a UL connection. This will add about -5dB of NFB in total. Since the cathode of the first stage does not have a bypass capacitor, a small amount of NFB is applied.
This will apply about -3dB of NFB to lower the internal resistance.Ī little less gain and less power. The feature of this circuit is a pentode, but the cathode voltage is returned to the output. thinking on 2nd Oct 2022.Īdditional comment: Many audiophiles don't like feedback, but use light local feedback on Pentodes because the bare DF is low, below 0.5. NOTE: I will start para feed EL84 single ended amplifier ASAP. It is possible for a famous transformer company to manufacture a transformer that covers from 10Hz to 130Khz by adding a gap or winding it in a sandwich. There is a gap in the core to improve the low frequencies.Ī normally wound transformer can only take a band of about 100Hz to 20Khz. Moreover, the transformer with good high-frequency characteristics is wound like this. He is still in good health and is experimenting with many prototypes as an engineer.Ībout Transformer for Audio:Japanese trance and famous European trance are sandwich-wound because of the characteristic of how to wind the trance.
He stopped continuing for health reasons.Īfter that, old staff of TANGO and new CEO started a new business on 2016 Suzuki was the president of TANGO around 1992. Perhaps the boom in making small tube amplifier came around that time. Perhaps the boom in making small tube amps happened around that time. Suzuki of ISO transformer is a circuit diagram written 1992 This schematic is copied due to copyright, but most of it is the circuit designed by him. 🇯🇵 Japanese if you have time please visit Japanese If did you see X11 ,Linux means family of UNIX and Navigator.
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