@kosst_amojan,
in that case one of the TAN-4650 or TAN-5650 from Sony might be worth looking at. Sony sold many of those first gen integrates and while they do not have the survival rate of Yamaha, there are some still around.
The Sony v-fets are probably more linear than Yamaha's and rather easier to match since Sony was not so coy about marking them by rank...well Yamaha and NEC did in a sense too, but that can be debatable.
in that case one of the TAN-4650 or TAN-5650 from Sony might be worth looking at. Sony sold many of those first gen integrates and while they do not have the survival rate of Yamaha, there are some still around.
The Sony v-fets are probably more linear than Yamaha's and rather easier to match since Sony was not so coy about marking them by rank...well Yamaha and NEC did in a sense too, but that can be debatable.