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15th April 2012, 10:28 AM  #11  
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders

Quote:
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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regards Andrew T. Sent from my desktop computer using a keyboard 

15th April 2012, 10:57 AM  #12 
diyAudio Member
Join Date: Oct 2003

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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15th April 2012, 06:30 PM  #13  
Try not, do!
diyAudio Member

Quote:
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BBB/Hermes/Cronus>TPBII>Dynaco ST70 Brian Clark Input Stage>Thor (Seas) 

16th April 2012, 12:03 PM  #15  
diyAudio Member
Join Date: Jul 2005
Location: North East

Quote:
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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"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P. 

16th April 2012, 03:18 PM  #16 
Try not, do!
diyAudio Member

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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BBB/Hermes/Cronus>TPBII>Dynaco ST70 Brian Clark Input Stage>Thor (Seas) 
16th April 2012, 04:05 PM  #17 
diyAudio Member
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. 
16th April 2012, 06:44 PM  #18  
diyAudio Member
Join Date: Jul 2005
Location: North East

Quote:
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. 

16th April 2012, 07:26 PM  #19  
diyAudio Member
Join Date: Feb 2004
Location: Amsterdam, NL

Quote:
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. 

16th April 2012, 07:28 PM  #20  
Try not, do!
diyAudio Member

flg
Quote:
Please see posts 13 & 15
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BBB/Hermes/Cronus>TPBII>Dynaco ST70 Brian Clark Input Stage>Thor (Seas) 

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