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Old 26th April 2012, 09:29 AM   #51
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
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) (NN NN PP PP)triple point + possibly 20NN and 20PP single point
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)
johnwmclean 4 pairs (1 stereo F5X) (NNNNPPPP)
buzzforb 4 Pairs (1 stereo FX5) (NNNNPPPP)
bkdog 4 Pairs (1 stereo FX5) (NNNNPPPP)
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Old 26th April 2012, 03:40 PM   #52
pchw is offline pchw  United States
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Location: Fremont, California
There is a Google spreadsheet set up, see post #1.
It is easier to manage there than copy, edit, & paste, but it will be the GB organizer/leader choice what works the best for him. Also feel free to add additional columns for different type of matched sets.

Current number of F5X sets are 46.
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Old 27th April 2012, 04:14 AM   #53
EUVL is offline EUVL  Europe
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Give it a day or two.

You will get a GB leader, and maybe also someone who is willing to curve trace match using my equipment.
Alexis already volunteered to do data processing after measurements.

You are a real lucky lot.


Patrick
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Old 27th April 2012, 04:54 PM   #54
Ghumbs is offline Ghumbs  United States
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Location: Seattle, WA
Please add me to the list for 1 stereo set. Thanks!
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Old 27th April 2012, 07:23 PM   #55
ashaw is offline ashaw  Australia
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Patrick, If we were to have curve trace data, then do you think that it would be possible to have Degenerated matches, that is matches that exist with changes to the sense resistors (i.e. with a resistor in parallel with the fuku) if so then would this allow us to get better performance and matches then without them.
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Old 28th April 2012, 05:09 AM   #56
EUVL is offline EUVL  Europe
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Join Date: Oct 2003
There is no need or no advantage for a degenerated match.
The degenerated performance you can calculate using a spread sheet.
Match without degen is more sensitive and hence will allow you to pick a match pair more accurately.

We use a Isabellehütten PBV 0R1 on heatsink as reference resistor to measure current.
You cannot get a better power resistor, even in comparison with Caddock MP9100, ...., etc.
See :

http://www.diyaudio.com/forums/analo...ml#post2996814


Patrick

PS You will then ask why I did not choose this for the amp.
I want to use the Fuku's higher positive tempco to compensate for the MOSFET and hence enhance bias stability.
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Old 28th April 2012, 08:32 AM   #57
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Join Date: Feb 2005
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) (NN NN PP PP)triple point + possibly 20NN and 20PP single point
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)
johnwmclean 4 pairs (1 stereo F5X) (NNNNPPPP)
buzzforb 4 Pairs (1 stereo FX5) (NNNNPPPP)
bkdog 4 Pairs (1 stereo FX5) (NNNNPPPP)
vitalica 8 pairs for 2 F5X (NNNNPPPP x 2)
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Old 28th April 2012, 10:14 AM   #58
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Location: Burlington, NC
Quote:
Originally Posted by EUVL View Post
There is no need or no advantage for a degenerated match.
The degenerated performance you can calculate using a spread sheet.
Match without degen is more sensitive and hence will allow you to pick a match pair more accurately.

We use a Isabellehütten PBV 0R1 on heatsink as reference resistor to measure current.
You cannot get a better power resistor, even in comparison with Caddock MP9100, ...., etc.
See :

http://www.diyaudio.com/forums/analo...ml#post2996814


Patrick

PS You will then ask why I did not choose this for the amp.
I want to use the Fuku's higher positive tempco to compensate for the MOSFET and hence enhance bias stability.
I really have to start following that thread. A wealth of info can be foun there. He didnt talk about how they t,sounded though: D
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Old 28th April 2012, 10:52 AM   #59
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EUVL,
could you explain the tempco value of a resistor and how it affects response? Perhaps this would clarify for some you explanation above over resistor choice. Of course i mean explain to me.
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Old 28th April 2012, 12:23 PM   #60
EUVL is offline EUVL  Europe
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Consider total voltage across gate-source and source resistor at 25°C and 60°C at 2A current.
There are sufficient information in datasheet of MOSFET and resistor to allow you to make estimations.


Patrick
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