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Hi everyone.
I found such a thing, do I need to have in the SEPP is the first part in this schematic?

smmymms wrote:Hi everyone.
I found such a thing, do I need to have in the SEPP is the first part in this schematic?

what do you need exactly?

2SJ74 is the end of production. I'd like to achieve in the emitter follower of 2SK170.

A simple google search revealed:

2N5459 for the 2SK170
2N5462 for the 2SJ74

Thanks arph
But, I think I want to use Japanese FET I live in Japan.
I want to know the meaning of the first stage using the SEPP.

But can't you just order them from tayda or something? they ship international.

I don't know what you mean with SEPP

^ Single-ended push pull

Ah, yes.

Well I guess it is to buffer the signal from the 4n7 - 1k and 10k parallel tone shaping right before the op amps. Why the designer chose SEPP stages I don't know.

~arph wrote:Why the designer chose SEPP stages I don't know.

Yeah that's just crazy.

It looks like they chose a 5532 for whatever reason, and then ran into the problem of its low input impedance (especially with a piezo). So they tacked on the buffers, choosing a SEPP over a single JFET for reasons best left a mystery.

Could have avoided all those extra parts by using a more conventional high impedance input op-amp in a non-inverting configuration in place of the 5532.

It's as I thought too.
I was glad to clear it
Very thanks!