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Old 15th April 2012, 11:28 AM   #11
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by EUVL View Post
One good solution is to see whether you can buy NNNNNNNN & PPPPPPPP from Zhou.
Then you have a better chance to find good NN-NNs & PP-PPs.
I got NNNN PPPP NNNN PPPP from Zhou.
I could not get any N to P selection @ 500mA Id
I could not get any NN nor any PP selection at 2A Id
I could get NN, NN, NN from 500mA to 1.3A of Id, well short of 2A
I could get PP, PP from 500mA to 1.3A of Id, again well short of 2A.
These were specifically bought as matched quads specifically for the F5x. I got rubbish that met Zhou's spec not the F5x spec.

From my 16 devices @ premium price and a lot of work measuring and measuring again I have enough for one very good NN & PP channel and enough for a NN & PP nearly good channel. For the other two channels I am no where near to good matches.
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Old 15th April 2012, 11:57 AM   #12
EUVL is offline EUVL  Europe
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We can argue how well matched the left and the right channel devices should be.
Especially for amplifiers with negative loop feedback (in the case of F5X about 30dB), you can get away with less than ideal match between channels.

But I agree that matching at working Id (and Vds if possible) is more important, especially for Toshibas as they have a smaller Vgs than, e.g. IRFPs.

So ideally you should lobby Zhou to match at 2A at least.
Keeping the temperature of the MOSFET under control is a bit more tricky than matching at 500mA and Vds = Vgs.

In the end, it is the amount of work required, and as a result how much you are prepared to pay.
Plus that Zhou has the FETs, but probably not the time (and perhaps also interest) to do large scale, complicated matching.


Patrick
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Old 15th April 2012, 07:30 PM   #13
ichiban is offline ichiban  United States
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Quote:
Originally Posted by pchw View Post
NicMac 8 pairs (2 stereo F5X) (NNNNPPPP x 2)
CanAm Man 4 pairs (1 stereo FX5) (NNNNPPPP)
ramallo 4 pairs (1 stereo FX5) (NNNNPPPP)
oneaclock 4 pairs (1 stereo FX5) (NNNNPPPP)
andrewt 4 pairs (1 stereo FX5) (NNNNPPPP)
Studley 4 pairs (1 stereo FX5) (NNNNPPPP)
ashaw 8 stereo sets? (NNNNPPPP x 8 ??)
triode4 4 pairs (1 stereo F5X) (NNNNPPPP)
heinz1 4 pairs (1 stereo F5X) (NNNNPPPP)
Mravinsky 4 pairs (1 stereo FX5) (NNNNPPPP)
JBdV 8 pairs for 2 F5X (NNNNPPPP x 2)
smyslow 4 pairs (1 stereo F5X) (NNNNPPPP)
APK 4 pairs (1 stereo F5X) (NNNNPPPP)
Horio 4 pairs (1 stereo F5X) (NNNNPPPP)
Westley 4 pairs (1 stereo F5X) (NNNNPPPP)
alazira 4 pairs (1 stereo F5X) (NNNNPPPP)
pmchoong 4 pairs (1 stereo F5X) (NNNNPPPP)
CeeVee 4 pairs (1 stereo F5X) (NNNNPPPP)
lhquam 4 pairs (1 stereo F5X) (NNNNPPPP)
ichiban 4 pairs (1 stereo FX5) (NNNNPPPP)
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Old 16th April 2012, 04:41 AM   #14
pchw is online now pchw  United States
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Last edited by pchw; 16th April 2012 at 05:02 AM. Reason: update wordings.
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Old 16th April 2012, 01:03 PM   #15
flg is offline flg  United States
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Quote:
Originally Posted by pchw View Post
To all potential participants, you can copy the list and append your name or edit your entry.
First, update the list:
NicMac 8 pairs (2 stereo F5X) (NNNNPPPP x 2)
CanAm Man 4 pairs (1 stereo FX5) (NNNNPPPP)
ramallo 4 pairs (1 stereo FX5) (NNNNPPPP)
oneaclock 4 pairs (1 stereo FX5) (NNNNPPPP)
andrewt 4 pairs (1 stereo FX5) (NNNNPPPP)
Studley 4 pairs (1 stereo FX5) (NNNNPPPP)
ashaw 8 stereo sets? (NNNNPPPP x 8 ??)
triode4 4 pairs (1 stereo F5X) (NNNNPPPP)
heinz1 4 pairs (1 stereo F5X) (NNNNPPPP)
Mravinsky 4 pairs (1 stereo FX5) (NNNNPPPP)
JBdV 8 pairs for 2 F5X (NNNNPPPP x 2)
smyslow 4 pairs (1 stereo F5X) (NNNNPPPP)
APK 4 pairs (1 stereo F5X) (NNNNPPPP)
Horio 4 pairs (1 stereo F5X) (NNNNPPPP)
Westley 4 pairs (1 stereo F5X) (NNNNPPPP)
alazira 4 pairs (1 stereo F5X) (NNNNPPPP)
pmchoong 4 pairs (1 stereo F5X) (NNNNPPPP)
CeeVee 4 pairs (1 stereo F5X) (NNNNPPPP)
lhquam 4 pairs (1 stereo F5X) (NNNNPPPP)
flg 4 Pairs (1 stereo FX5) (NNNNPPPP)
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Old 16th April 2012, 04:18 PM   #16
ichiban is offline ichiban  United States
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First, update the list:
NicMac 8 pairs (2 stereo F5X) (NNNNPPPP x 2)
CanAm Man 4 pairs (1 stereo FX5) (NNNNPPPP)
ramallo 4 pairs (1 stereo FX5) (NNNNPPPP)
oneaclock 4 pairs (1 stereo FX5) (NNNNPPPP)
andrewt 4 pairs (1 stereo FX5) (NNNNPPPP)
Studley 4 pairs (1 stereo FX5) (NNNNPPPP)
ashaw 8 stereo sets? (NNNNPPPP x 8 ??)
triode4 4 pairs (1 stereo F5X) (NNNNPPPP)
heinz1 4 pairs (1 stereo F5X) (NNNNPPPP)
Mravinsky 4 pairs (1 stereo FX5) (NNNNPPPP)
JBdV 8 pairs for 2 F5X (NNNNPPPP x 2)
smyslow 4 pairs (1 stereo F5X) (NNNNPPPP)
APK 4 pairs (1 stereo F5X) (NNNNPPPP)
Horio 4 pairs (1 stereo F5X) (NNNNPPPP)
Westley 4 pairs (1 stereo F5X) (NNNNPPPP)
alazira 4 pairs (1 stereo F5X) (NNNNPPPP)
pmchoong 4 pairs (1 stereo F5X) (NNNNPPPP)
CeeVee 4 pairs (1 stereo F5X) (NNNNPPPP)
lhquam 4 pairs (1 stereo F5X) (NNNNPPPP)
ichiban 4 pairs (1 stereo FX5) (NNNNPPPP)

To all potential participants, you can copy the list and append your name
or edit your entry.
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Old 16th April 2012, 05:05 PM   #17
APK is offline APK  United Kingdom
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Join Date: Jan 2005
Location: NW
First, update the list:
NicMac 8 pairs (2 stereo F5X) (NNNNPPPP x 2)
CanAm Man 4 pairs (1 stereo FX5) (NNNNPPPP)
ramallo 4 pairs (1 stereo FX5) (NNNNPPPP)
oneaclock 4 pairs (1 stereo FX5) (NNNNPPPP)
andrewt 4 pairs (1 stereo FX5) (NNNNPPPP)
Studley 4 pairs (1 stereo FX5) (NNNNPPPP)
ashaw 8 stereo sets? (NNNNPPPP x 8 ??)
triode4 4 pairs (1 stereo F5X) (NNNNPPPP)
heinz1 4 pairs (1 stereo F5X) (NNNNPPPP)
Mravinsky 4 pairs (1 stereo FX5) (NNNNPPPP)
JBdV 8 pairs for 2 F5X (NNNNPPPP x 2)
smyslow 4 pairs (1 stereo F5X) (NNNNPPPP)
APK 12 pairs (3 stereo F5X) (NNNNPPPP)
Horio 4 pairs (1 stereo F5X) (NNNNPPPP)
Westley 4 pairs (1 stereo F5X) (NNNNPPPP)
alazira 4 pairs (1 stereo F5X) (NNNNPPPP)
pmchoong 4 pairs (1 stereo F5X) (NNNNPPPP)
CeeVee 4 pairs (1 stereo F5X) (NNNNPPPP)
lhquam 4 pairs (1 stereo F5X) (NNNNPPPP)
ichiban 4 pairs (1 stereo FX5) (NNNNPPPP)

To all potential participants, you can copy the list and append your name
or edit your entry.
  Reply With Quote
Old 16th April 2012, 07:44 PM   #18
flg is offline flg  United States
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Join Date: Jul 2005
Location: North East
Quote:
Originally Posted by ichiban View Post
First, update the list:
NicMac 8 pairs (2 stereo F5X) (NNNNPPPP x 2)
CanAm Man 4 pairs (1 stereo FX5) (NNNNPPPP)
ramallo 4 pairs (1 stereo FX5) (NNNNPPPP)
oneaclock 4 pairs (1 stereo FX5) (NNNNPPPP)
andrewt 4 pairs (1 stereo FX5) (NNNNPPPP)
Studley 4 pairs (1 stereo FX5) (NNNNPPPP)
ashaw 8 stereo sets? (NNNNPPPP x 8 ??)
triode4 4 pairs (1 stereo F5X) (NNNNPPPP)
heinz1 4 pairs (1 stereo F5X) (NNNNPPPP)
Mravinsky 4 pairs (1 stereo FX5) (NNNNPPPP)
JBdV 8 pairs for 2 F5X (NNNNPPPP x 2)
smyslow 4 pairs (1 stereo F5X) (NNNNPPPP)
APK 4 pairs (1 stereo F5X) (NNNNPPPP)
Horio 4 pairs (1 stereo F5X) (NNNNPPPP)
Westley 4 pairs (1 stereo F5X) (NNNNPPPP)
alazira 4 pairs (1 stereo F5X) (NNNNPPPP)
pmchoong 4 pairs (1 stereo F5X) (NNNNPPPP)
CeeVee 4 pairs (1 stereo F5X) (NNNNPPPP)
lhquam 4 pairs (1 stereo F5X) (NNNNPPPP)
ichiban 4 pairs (1 stereo FX5) (NNNNPPPP)

To all potential participants, you can copy the list and append your name
or edit your entry.
If you don't remove other's names...

First, update the list:
NicMac 8 pairs (2 stereo F5X) (NNNNPPPP x 2)
CanAm Man 4 pairs (1 stereo FX5) (NNNNPPPP)
ramallo 4 pairs (1 stereo FX5) (NNNNPPPP)
oneaclock 4 pairs (1 stereo FX5) (NNNNPPPP)
andrewt 4 pairs (1 stereo FX5) (NNNNPPPP)
Studley 4 pairs (1 stereo FX5) (NNNNPPPP)
ashaw 8 stereo sets? (NNNNPPPP x 8 ??)
triode4 4 pairs (1 stereo F5X) (NNNNPPPP)
heinz1 4 pairs (1 stereo F5X) (NNNNPPPP)
Mravinsky 4 pairs (1 stereo FX5) (NNNNPPPP)
JBdV 8 pairs for 2 F5X (NNNNPPPP x 2)
smyslow 4 pairs (1 stereo F5X) (NNNNPPPP)
APK 12 pairs (3 stereo F5X) (NNNNPPPP)
Horio 4 pairs (1 stereo F5X) (NNNNPPPP)
Westley 4 pairs (1 stereo F5X) (NNNNPPPP)
alazira 4 pairs (1 stereo F5X) (NNNNPPPP)
pmchoong 4 pairs (1 stereo F5X) (NNNNPPPP)
CeeVee 4 pairs (1 stereo F5X) (NNNNPPPP)
lhquam 4 pairs (1 stereo F5X) (NNNNPPPP)
flg 4 Pairs (1 stereo FX5) (NNNNPPPP)
ichiban 4 pairs (1 stereo FX5) (NNNNPPPP)

To all potential participants, you can copy the list and append your name
or edit your entry.
__________________
"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P.
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Old 16th April 2012, 08:26 PM   #19
daanve is offline daanve  Netherlands
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Join Date: Feb 2004
Location: Amsterdam, NL
Quote:
Originally Posted by flg View Post
If you don't remove other's names...

First, update the list:
NicMac 8 pairs (2 stereo F5X) (NNNNPPPP x 2)
CanAm Man 4 pairs (1 stereo FX5) (NNNNPPPP)
ramallo 4 pairs (1 stereo FX5) (NNNNPPPP)
oneaclock 4 pairs (1 stereo FX5) (NNNNPPPP)
andrewt 4 pairs (1 stereo FX5) (NNNNPPPP)
Studley 4 pairs (1 stereo FX5) (NNNNPPPP)
ashaw 8 stereo sets? (NNNNPPPP x 8 ??)
triode4 4 pairs (1 stereo F5X) (NNNNPPPP)
heinz1 4 pairs (1 stereo F5X) (NNNNPPPP)
Mravinsky 4 pairs (1 stereo FX5) (NNNNPPPP)
JBdV 8 pairs for 2 F5X (NNNNPPPP x 2)
smyslow 4 pairs (1 stereo F5X) (NNNNPPPP)
APK 12 pairs (3 stereo F5X) (NNNNPPPP)
Horio 4 pairs (1 stereo F5X) (NNNNPPPP)
Westley 4 pairs (1 stereo F5X) (NNNNPPPP)
alazira 4 pairs (1 stereo F5X) (NNNNPPPP)
pmchoong 4 pairs (1 stereo F5X) (NNNNPPPP)
CeeVee 4 pairs (1 stereo F5X) (NNNNPPPP)
lhquam 4 pairs (1 stereo F5X) (NNNNPPPP)
flg 4 Pairs (1 stereo FX5) (NNNNPPPP)
ichiban 4 pairs (1 stereo FX5) (NNNNPPPP)

To all potential participants, you can copy the list and append your name
or edit your entry.
If you don't remove other's names...

First, update the list:
NicMac 8 pairs (2 stereo F5X) (NNNNPPPP x 2)
CanAm Man 4 pairs (1 stereo FX5) (NNNNPPPP)
ramallo 4 pairs (1 stereo FX5) (NNNNPPPP)
oneaclock 4 pairs (1 stereo FX5) (NNNNPPPP)
andrewt 4 pairs (1 stereo FX5) (NNNNPPPP)
Studley 4 pairs (1 stereo FX5) (NNNNPPPP)
ashaw 8 stereo sets? (NNNNPPPP x 8 ??)
triode4 4 pairs (1 stereo F5X) (NNNNPPPP)
heinz1 4 pairs (1 stereo F5X) (NNNNPPPP)
Mravinsky 4 pairs (1 stereo FX5) (NNNNPPPP)
JBdV 8 pairs for 2 F5X (NNNNPPPP x 2)
smyslow 4 pairs (1 stereo F5X) (NNNNPPPP)
APK 12 pairs (3 stereo F5X) (NNNNPPPP)
Horio 4 pairs (1 stereo F5X) (NNNNPPPP)
Westley 4 pairs (1 stereo F5X) (NNNNPPPP)
alazira 4 pairs (1 stereo F5X) (NNNNPPPP)
pmchoong 4 pairs (1 stereo F5X) (NNNNPPPP)
CeeVee 4 pairs (1 stereo F5X) (NNNNPPPP)
lhquam 4 pairs (1 stereo F5X) (NNNNPPPP)
flg 4 Pairs (1 stereo FX5) (NNNNPPPP)
ichiban 4 pairs (1 stereo FX5) (NNNNPPPP)
daanve 8 pairs for 2 F5X (NNNNPPPP x 2)

To all potential participants, you can copy the list and append your name
or edit your entry.
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Old 16th April 2012, 08:28 PM   #20
ichiban is offline ichiban  United States
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Default flg

Quote:
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If you don't remove other's names...

First, update the list:


To all potential participants, you can copy the list and append your name
or edit your entry.

Please see posts 13 & 15
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