P-channels are probably not necessary in their business plans.
Sony VFETs? Yes, I was absolutely considering doing that. Maybe putting my ZV9 and F5 on hold for a while. Ebay is a terrible place ...
Have you managed to get datasheets of VFETs?
The VFETs are similar to a JFET, except for power (?). But I think I remember something about burned VFET amps in abundance in the 70ties/80ties, or was that maybe the Sony class D with VFETs? (Rumoured to be a not so good implementation.)
I found a few shematics of DIY VFET amplifiers, not All-JFET, so maybe i is funnier to have Google translate them to English...
Anyway, found these:
http://www.est.hi-ho.ne.jp/jack-morita/sub06/sub06.html
http://www.geocities.jp/mutsu562000/hp005.htm
http://homepage2.nifty.com/~mhitaste/audiotop/audioamppage/amp007_vfetpoweramp_001.html
Even Hiraga have used VFETs http://www.tcaas.btinternet.co.uk/hiraga2.htm
RK
Sony VFETs? Yes, I was absolutely considering doing that. Maybe putting my ZV9 and F5 on hold for a while. Ebay is a terrible place ...
Have you managed to get datasheets of VFETs?
The VFETs are similar to a JFET, except for power (?). But I think I remember something about burned VFET amps in abundance in the 70ties/80ties, or was that maybe the Sony class D with VFETs? (Rumoured to be a not so good implementation.)
I found a few shematics of DIY VFET amplifiers, not All-JFET, so maybe i is funnier to have Google translate them to English...
Anyway, found these:
http://www.est.hi-ho.ne.jp/jack-morita/sub06/sub06.html
http://www.geocities.jp/mutsu562000/hp005.htm
http://homepage2.nifty.com/~mhitaste/audiotop/audioamppage/amp007_vfetpoweramp_001.html
Even Hiraga have used VFETs http://www.tcaas.btinternet.co.uk/hiraga2.htm
RK
I speculate it uses a 24v dual rail supply
Or 2x18 v Ac, so...
Attachments
2sk77b
BTW it seems the VFET of the Yamaha B-1 exists as the 2SK77B today and is used in an amplifier http://www.digital-do-main.com/product/index.html called starngely enough B-1a.
Thought I had to share this!
BTW it seems the VFET of the Yamaha B-1 exists as the 2SK77B today and is used in an amplifier http://www.digital-do-main.com/product/index.html called starngely enough B-1a.
Thought I had to share this!
Perhaps you want to start buying Sony 2SJ28 and 2SK82's
How many should we get?
I was thinking of at least 2x n and 2x p per side equals 4 pairs, as each is 10 A and 95 W. But I guess "we" are going first watt class A so it will not be 100 W output power per side. But that was were I would have started, papa might have other and better ideas
And if one wanted only 5W?
They don't have any interest that I'm aware of. Perhaps
you want to start buying Sony 2SJ28 and 2SK82's
After my first test, I have doubts that Vfet will work well in SE class A amps as your ZEN-like or J2 amplifiers
Am I mistaken? i hope.
Francesco.
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And what might that little 6 legged alien be?interesting detail
food for thoughts
And what might that little 6 legged alien be?
CNY17 ,what else ?
that's 2N3055 of optocouplers ....
dunno - probably some sort of limiter/protection circ
anyway - let's wait to Papa publish his schematic ..... even if I'm greedy to learn something new
I want to eat it
what this food is ???
A 6 legged TL431? (TI makes one) I'd have thought TO-92 tastier.
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