Vfet / SIT Amplifiers

Both, the B-3 and the JM-S7, are fantastic amps. I can't agree more about the sound signature of the B-3.
Unfortunately for you, now you are tainted by the vfet virus and I have a prediction to make that your vfet collection will gradually grow :)

I have most of all Vfet amps ever made and I never get tires of listening to them. B-3s are special indeed and besides the Sansui BA-1000s, they are the only vfet amps that could be used in BTL mode, albeit, if you have hungry speakers, the B-3 or the BA-1000s are not the best choice, while using them in BTL mode.

You will also enjoy the Victor but the sound signature of the NEC vfets is different than that of the Yamaha.
Note that all three of your amps will need restoration soon.

If that's the virus, I'll gladly stay unvaccinated :) That's why I bought third B-3 to make sure I've got a backup in case of some fatal failure, they are on 24/7 :)
And Sansui BA-1000 is on its way and I'm looking for Sony TA-N7.

OH YEAH, that Sony is wicked too. A marvel of audio circuit design. It is actually part vfet part bjt.

And if you like the B-3 so much, wait until you hear the B-2 and the B-1  :)

I should have mentioned, the Sansui is nice but is no giant killer. It uses the same type of NEC vfets as the JM-S7 you have, but of different rank. You would enjoy it for sure but I am thinking you would enjoy the B-3s a bit more.

Do you actually reckon, that the B-2 or the B-1 is better than the B-3? I've read quite the opposite, that's why I went for the B-3 in the first place.