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Old 27th November 2001, 02:42 AM   #1
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Hello Brendon
Not to much progress, weekend weather fantastic. Spend it riding my bike all over the city. 17 degrees, unheard of in late november.
I think my HS worries are over for the moment. My next concern is matching mosfets. I believe at one time Nelson Pass sold matched pairs, no longer the case. Anyone out there aware of a source for matched pairs.
Gustavo
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Old 27th November 2001, 05:47 AM   #2
jduncan is offline jduncan  United States
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Just buy more than you need....and match them....

although I WILL (within a day or two) have some spare matched IRF9610's and IRFP240's left over from my own matching exercises....

If you really want pre-matched ones I can probably work out a deal there.
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Old 27th November 2001, 12:14 PM   #3
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Default Matching FETs

Gustavo,

Matching mosfets is very time consuming (more time than matching 1% resistors). When I ordered the FETs for my BLS pre-amp I also ordered a batch of IRFP-240 (for another SoZ project at my other home in Canada and of course.. for back-up).

For the 4 channel pre-amp, I ordered 30 IRF610 and most of them matched - even found quad set matches.

You have my e-mail so let me know if you need any.

re: jduncan

IRF9610 are P-Chan devices. I assume they're not for the BLS pre-amp project? Only 1 IRF9610 mosfet is required in the pre-amp which goes in the power supply board.
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Old 27th November 2001, 05:03 PM   #4
jduncan is offline jduncan  United States
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super_bq:

No, I'm using the IRF9610's as the input differential pair in my Aleph 4.

But again, if anyone wants to buy pre-matched sets of these I've got a few of both IRF9610's and IRFP240's sitting around.
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Old 28th November 2001, 09:04 PM   #5
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Default matched mosfets

Guys, if you have extra matched mosfets, I'm more than wiling to take them off your hands. Save me a bit of grief and money trying to do it myself.
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Old 2nd December 2001, 12:03 AM   #6
jduncan is offline jduncan  United States
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OK, after taking out the mosfets I want myself, I now have these additional IRFP240's available...of course I'd prefer it if someone wants to take most/all of them but just contact me anyway.

Vgs
4.29
4.27
4.38
4.33
4.42
4.30
4.38
4.32
4.30
4.27
4.34
4.32
4.36
4.29
4.18
4.28
4.40
4.29
4.14
4.27
4.28
4.16
4.14
4.39
4.41
4.37

From an initial purchase of 50, I took the 24 which were between 4.20 and 4.26.

Cheers,

Joseph
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Old 3rd January 2002, 12:49 PM   #7
Variac is offline Variac  United States
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Default need them matched pairs

I need to buy some irf 240 or 244 matched pairs
Minimum of 2 pr. but 4 would give me some back-ups
I'm making a SOZ

Anyone still have some from their Pass projects? I guess I'm too lazy or overwhelmed to want to match 'em.

Actually I'm just in a big hurry to hear these amps!


Thanks,
Mark
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Old 3rd January 2002, 05:11 PM   #8
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Mark, it might be fun testing out the arrangement as seen on Fig.16 of the Zen Lightenment article. saves you the trouble of having to find the ( elusive? ) matched pair.
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Old 3rd January 2002, 10:15 PM   #9
PassFan is offline PassFan  United States
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Default Borbely Audio

www.borbelyaudio.com sells mosfets and he will match them. I don't think he sells IRF but he has toshiba and I think Hitachi. He also sells some nice kits
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Old 3rd January 2002, 11:23 PM   #10
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Borbely is a great guy, and you can have complete
confidence in anything he offers.
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