What should I build - have 2sk60 (4) and 2sj18 (4)

[lpaudio2]

So I did not win the v-fet lotto and i'm trying to make lemonade out of my lemons.



I happened on a working / fully functional (measures good) Sony TAN-5550. I was going to just do some updates (caps, diodes etc), but i'm considering maybe building a new amp to try the vfets in... they are rank 58! Not giving up on the Sony, but I think a new design could do better.



I'm not a novice, but far from a expert. I probably need a design, with boards and some test points with voltages to check.



So what should I build?!

 

[WalterW]

If you parallel two 2SK60's and two 2SJ18's than you can consider the result as a single 2SK82 and a single 2Sj28. And you can use all Papa's VFET designs.

 

[Dennis Hui]

There is still the Round 2 of the lottery to go. 🙂

Members have built this using 2sk60/2sj18, but at lower bias:
https://firstwatt.com/pdf/art_diy_sony_vfet.pdf

There will likely be versions of the SE vfet amp for 2sk60/2sj18 later as well.

 

[Nelson Pass]

You should wait for part 3 which has circuits and pc boards to accommodate these
particular parts. The 2SJ18 ad 2SK60 are the single-die versions of the duals in
2SK82 and 2SJ28, and unless you are driving 16 ohm will need a mu follower instead
of a constant current source.

No big deal, and patience will be rewarded.

 

[martyh]

I’m patiently waiting and actually enjoying the suspense 🙂 I predict a surplus of 2SK63 pulls looking for a project once part 3 is published.

 

[lpaudio2]

Wow. What a helpful set of responses. And Nelson, thanks SO much for all you do here and your super helpful response. Happy to wait. Good things come to those that wait! I'm still enjoying the b1 buffer I built years ago!