mr_whocares,
I think Mark Johnson was referring to the DIY Sony VFET amplifier being discussed in this thread:
https://www.diyaudio.com/forums/pass-labs/370282-diy-sony-vfet-pt-1-a.html#post6596619
I think Mark Johnson was referring to the DIY Sony VFET amplifier being discussed in this thread:
https://www.diyaudio.com/forums/pass-labs/370282-diy-sony-vfet-pt-1-a.html#post6596619
To me the VFET V1 is . . . SEPP.
That is, the pull-part is the mu-stage.
By carefull tuning the Mu-stage gets a different harmonic signature than the bottom part feeding the current. That tuning depends on the S (Siemens) of the device on top. And must be done catering for the feed from the bottom.
Nelson Pass is a wizard in being able to do that blending.
The Mu does not know
whether the bottom is drain or source loaded. [The VFET neither - I asked the guy 
]yes, diy sony vfet has more control and better timing than my 300b, especially in the low frequencies region. i reported my impressions in " Sony Vfet Illustrated build guide "
in the past 6 months i have been listing only with the 300b, but i am sure by end of the year i will switch again for a while back to diy sony vfets. there is always something magical with 300b i can not describe which makes you addicted to it. the sound stage is some how more "rich" (H2 ?) and even the sound might have some colouration but it is at the same time so warm and appealing. for sure the selection of the tubes makes difference in sound quality as always. for 300b i have been using western electric, emission labs (and full music), and i like the WE the most. a friend of mine described the difference between the emission labs and the WE as " arriving home after a very nice vacation"
i am very looking forward to build the SE diy sony vfet pt1 and hope the next lottery gives me the chance
best regards
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yes, i think so.
"diy sony vfet" is a PP and "diy sony vfet pt1" is SE . the names are a bit confusing
and as usual zen mod is to blame mr_whocares,
That is a unique looking 300B amp you have there - I am guessing mono-blocks?
Just wait, ZM will put the blame on you know who...
That is a unique looking 300B amp you have there - I am guessing mono-blocks?
"diy sony vfet" is a PP and "diy sony vfet pt1" is SE . the names are a bit confusing
Just wait, ZM will put the blame on you know who...
yes, monoblocks designed by Dick van de Merwe.
Triodedick Ceasar II 300B SE versterker - Audio Creative
i have heard some very good 300b implementations and dick's "ceasar " is surely one of them.
my enclosure design is half ready
. it should get an aluminium "outer housing" matching to my CD player design (see attached rendered photo), but since i do not hear CDs any more i preferred to stay with the copper inner housing and save money for other projects ps. sorry everybody fo the off-topic!
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Papa is clumsy with names deliberately
so, not clumsy at all
Fun and confusing Greedy Boyz - with time it becomes First, instead of Second Nature
Origin of All ZM's Nightmares!
Ruler of Whale Viewpoints
we love papa and you for that what you are
namaste!
Are you referring to the P channel VFET circuit which was just released?
That is not a mu follower / SEPP - the mosfet is a constant current source.
I don't recall doing a mu follower Sony. I considered it, but the 2SJ28
likes a constant current source with an 8 ohm load, as does the 2SK82,
the next version up.
Awesome news Mr. Pass and thank you for taking the time to share your treasures and knowledge with us! Even though I have several sonically superb OEM V-FET amps I'm really looking forward for a chance to win your simply sophisticate SIT amp design.
