• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

Group Buy for Curve-Tracer-Matched 2SK3497 / 2SJ618 quads at 55°C

Jump to Latest
EUVL

EUVL

Member
Joined 2003
xen-audio.com
As mentioned earlier in the M2OPS thread, we were able to achieve much lower distortion with 2SK3497/2SJ618 than the popular IRFP pair :
https://www.diyaudio.com/community/...-and-maybe-a-power-whammy.390636/post-7173210

We also promised to offer matched quads of those, see here for details :
https://www.diyaudio.com/community/...-and-maybe-a-power-whammy.390636/post-7179541

We have now matched 300 pairs of those and can achieve a yield of ~80x NN-PP quads.
Spec is Vgs to 3mV between NN and PP, transconductance to 5%, and delta Vgs N-P within 0.25V.
This will have no consequence in the M2OPS-type complementary follower, as demonstrated by Twitchie :
https://www.diyaudio.com/community/...-and-maybe-a-power-whammy.390636/post-7206502

At 820HKD a quad, they only cost slightly more than 2x of a matched 2SK3497 pair.
This will include registered air mail and any PP fees.
As in the past 10 years, we only can ship FOB, and are not responsible for any postage losses.
Registered mail is not insured. But HK post has been proven very reliable in the past.
What happens at your end, they have no influence though.

You are free to order multiple quads, and will automatically be given Vgs close to each other.
We also have (only) 2 sets of Octets to the same spec, out of 600 devices.
Those interested in Octets should contact me by DIYA Conversation.

We only call for payment when GB is closed, and we are ready to ship.


Patrick
 
twitchie

twitchie

Member
Joined 2004
Paid Member
1 quad / von Ah / USA
1 quad / ItsAllInMyHead / USA
1 quad / Joschl / Germany
1 quad / Vunce / USA
1 quad / Dennis Hui / Canada
1 quad / davidjt / UK
1 quad / OtisCampbell / USA
1 quad / stonegreen / Germany
1 quad / Marcus Halberstram / USA
2 quad/ twitchie / Canada
 
wg45

wg45

Member
Joined 2010
1 quad / von Ah / USA
1 quad / ItsAllInMyHead / USA
1 quad / Joschl / Germany
1 quad / Vunce / USA
1 quad / Dennis Hui / Canada
1 quad / davidjt / UK
1 quad / OtisCampbell / USA
1 quad / stonegreen / Germany
1 quad / Marcus Halberstram / USA
2 quad/ twitchie / Canada
1 quad/ wg45 / USA
 
schultzsch

schultzsch

Member
Joined 2009
1 quad / von Ah / USA
1 quad / ItsAllInMyHead / USA
1 quad / Joschl / Germany
1 quad / Vunce / USA
1 quad / Dennis Hui / Canada
1 quad / davidjt / UK
1 quad / OtisCampbell / USA
1 quad / stonegreen / Germany
1 quad / Marcus Halberstram / USA
2 quad/ twitchie / Canada
1 quad/ wg45 / USA
2 quads / schultzsch / Romania
 
S

soundslave

Member
Joined 2010
1 quad / von Ah / USA
1 quad / ItsAllInMyHead / USA
1 quad / Joschl / Germany
1 quad / Vunce / USA
1 quad / Dennis Hui / Canada
1 quad / davidjt / UK
1 quad / OtisCampbell / USA
1 quad / stonegreen / Germany
1 quad / Marcus Halberstram / USA
2 quad/ twitchie / Canada
1 quad/ wg45 / USA
2 quads / schultzsch / Romania
1 quad /soundslave / USA
 
A

angchuck

Member
Joined 2005
1 quad / von Ah / USA
1 quad / ItsAllInMyHead / USA
1 quad / Joschl / Germany
1 quad / Vunce / USA
1 quad / Dennis Hui / Canada
1 quad / davidjt / UK
1 quad / OtisCampbell / USA
1 quad / stonegreen / Germany
1 quad / Marcus Halberstram / USA
2 quad/ twitchie / Canada
1 quad/ wg45 / USA
2 quads / schultzsch / Romania
1 quad /soundslave / USA
1 quad /Angchuck /Singapore
 
M

manniraj

Member
Joined 2012
1 quad / von Ah / USA
1 quad / ItsAllInMyHead / USA
1 quad / Joschl / Germany
1 quad / Vunce / USA
1 quad / Dennis Hui / Canada
1 quad / davidjt / UK
1 quad / OtisCampbell / USA
1 quad / stonegreen / Germany
1 quad / Marcus Halberstram / USA
2 quad/ twitchie / Canada
1 quad/ wg45 / USA
2 quads / schultzsch / Romania
1 quad /soundslave / USA
1 quad /Angchuck /Singapore
1 quad/ manniraj / USA
 
X

xraylaser

Member
Joined 2021
1 quad / von Ah / USA
1 quad / ItsAllInMyHead / USA
1 quad / Joschl / Germany
1 quad / Vunce / USA
1 quad / Dennis Hui / Canada
1 quad / davidjt / UK
1 quad / OtisCampbell / USA
1 quad / stonegreen / Germany
1 quad / Marcus Halberstram / USA
2 quad/ twitchie / Canada
1 quad/ wg45 / USA
2 quads / schultzsch / Romania
1 quad /soundslave / USA
1 quad /Angchuck /Singapore
1 quad/ manniraj / USA
1 quad / xraylaser / USA
 
You must log in or register to reply here.
Top Bottom