In article , Pete
wrote:
I am looking to build an amp for home theatre/hifi use. currently have
an amp using Hitachi's default design for mos fets from the '80's (
2sk49 2sj50 I think ). It is used with a tagmclaren av32r and ipl
acoustics tl4 speakers at the front and Ariston ( small black tubular
things that sound quite good ) at the back.

I plan using LM4702 but have three options for the output stage.

bipolar SAP15P and SAP15N 2SA1943 and 2SC5200 mosfet 2SK1530 and 2SJ201

I know I'm inviting WW3 but would there be any differance in sound
between them ?

No need for WW3 since no meaningful answer is possible without knowing the
actual details of the designs which use them, and more info on the use. :-)

The main thing you could tell from the above is the max power / current /
voltage you might be able to drive. But if that is 'sufficient' for your
speakers and listening level that becomes irrelevant to the choice.

If the SAP devices are of the type that are darlingtons with the internal
thermal compensation diodes, then they may make thermal stability easier.
But I personally never liked darlingtons or power fets as I found they
tended to be prone to ultrasonic hooting. But YMMV. The SAP and mosfets can
make driving and biassing easier. That said I am old fashioned so am most
comfortable with using simple bipolar output devices.

Slainte,

Jim

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