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Old 28th May 2013, 02:36 PM   #11
Marra is online now Marra  United Kingdom
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Check with Buzzforb he was selling matched sets of other FQA's.
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Old 28th May 2013, 06:14 PM   #12
6L6 is offline 6L6  United States
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IRFP240 / IRFP9240 Would work in the circuit. Buy a tube or two of each, make a simple match rig, you will probably get enough good matches for a few amps, use one set, you can sell off the rest for what you paid for the lot.
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Old 28th May 2013, 07:04 PM   #13
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Originally Posted by 6L6 View Post
IRFP240 / IRFP9240 Would work in the circuit. Buy a tube or two of each, make a simple match rig, you will probably get enough good matches for a few amps, use one set, you can sell off the rest for what you paid for the lot.
Thanks for the tip. BTW, is a FQP12P20 the same as a FQA12P20 except for the packaging? The spec sheets look similar but not exact.
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Old 28th May 2013, 07:19 PM   #14
6L6 is offline 6L6  United States
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Do you mean Buzz's Fets? Yes, that's my understanding. He verified with Fairchild that his are all genuine -- I have used plenty of his Fets and am very, very happy with them.
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Old 28th May 2013, 07:30 PM   #15
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Do you mean Buzz's Fets? Yes, that's my understanding. He verified with Fairchild that his are all genuine -- I have used plenty of his Fets and am very, very happy with them.
No, I meant in general. If I buy a Farichild FQP12P20 from Arrow or Digikey, do I essentially get a FQA12P20 in a TO-220 package?
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Old 28th May 2013, 07:36 PM   #16
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You don't want TO-220, rather TO-3P or TO-247. A TO-220 device will have a much smaller dissipation rating.
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Old 28th May 2013, 07:44 PM   #17
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You don't want TO-220, rather TO-3P or TO-247. A TO-220 device will have a much smaller dissipation rating.
I see. Thank you.
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Old 30th May 2013, 06:43 PM   #18
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IRFP240 / IRFP9240 Would work in the circuit. Buy a tube or two of each, make a simple match rig, you will probably get enough good matches for a few amps, use one set, you can sell off the rest for what you paid for the lot.
This amp has 16 MOSFETS: 2 channels, w/ 4 pos/neg pairs each. If I want to match the Vgs to <100 mV, does that mean: (A) All 16 must fall within 100 mV, (B) All of the positives must fall within 100 mV and all the negatives must fall within 100 mV, (C) Each pos/neg pair must fall within 100 mV, (D) other?

Thanks.
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Old 30th May 2013, 06:46 PM   #19
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B. all positive for one ch. and all negativ for 1 ch.
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Old 30th May 2013, 09:26 PM   #20
6L6 is offline 6L6  United States
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B) Match the N-channel to the N-channel and the P-channel to the P-channel. The bias pots will make up for the N's and P's not matching.
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