I am an amateur brewer, I do music engineering, I listen to music and I make amplifiers. I just joined you and I am here to learn your knowledge. Because I have a plan to make an amplifier. I found a schematic attached to a post and decided to make it and of course I have no knowledge. I would be happy for your help and please excuse my English. What do you suggest instead of 2sj74, I could not find it in my country and did you combine this JFET to N channel instead of P channel? I did not understand the R112 resistor? The outputs are N MOSFET, why is the input P JFET? Can't we make them all N channel? Also, I did not fully understand is this 24 0 24 source or 0 24? Thanks in advance.
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Please post in English. 
Rather poor translation:
Amateur beer producer, music producer, music producer and amplifier builder. The new size is cut and added to the new brother. Amfi yapmak lives in a planned kitchen with a bathroom and a kitchen. A single gönderiye a şema blue and yapmaya green decision and natural that hiçbir bilgim yok. Yardımınız is a very rich and powerful English book. If the 2sc74 is not installed, how can the JFET'i P channel be replaced by the N channel? New başlayan bi olduğum için stable food is not the direction of hangi olduğunu anlamadım. R112 1,138K in? MoSFET circuits, P JFET bottom? How does hepsin N channel function? Ayrıca, this 24 0 24 married woman will be able to understand 0 24 months? Şimdiden doubted.
Rather poor translation:
Amateur beer producer, music producer, music producer and amplifier builder. The new size is cut and added to the new brother. Amfi yapmak lives in a planned kitchen with a bathroom and a kitchen. A single gönderiye a şema blue and yapmaya green decision and natural that hiçbir bilgim yok. Yardımınız is a very rich and powerful English book. If the 2sc74 is not installed, how can the JFET'i P channel be replaced by the N channel? New başlayan bi olduğum için stable food is not the direction of hangi olduğunu anlamadım. R112 1,138K in? MoSFET circuits, P JFET bottom? How does hepsin N channel function? Ayrıca, this 24 0 24 married woman will be able to understand 0 24 months? Şimdiden doubted.
The power supply is +24V / 0V / -24V
R112 probably can be any nearby 1% or 2% value.
J1 must be P type due to the DC conditions for M2.
R112 probably can be any nearby 1% or 2% value.
J1 must be P type due to the DC conditions for M2.
Do you think I can use LSJ74A instead of 2sj74? Will it last because it is 25v and it is really expensive.
I would be worried about using a 25V part on a 24V rail.
Especially if the were expensive or hard to get.
Especially if the were expensive or hard to get.