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Old 2nd November 2010, 07:10 PM   #581
qusp is offline qusp  Australia
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lucky we can have both with this circuit we can have < -110db thd plus noise with single stage, excellent!

BTW guys, dont know if anybody else is keen, or its just me thats this nuts; but i'm going to get the 400R from texas components, for 0.01% tX220Z (custom Zfoil power resistor) will be over 30USD a piece (under 35 though and only a dollar less for 0.1%, so may as well get 0.01)., pricey, but I think if going for thin film, may as well take it to the next level, well actually its another level again. they are not much use for the 200R as they are only rated for 10W but I think that will be fine for the 400R right opc?

I have asked my contact there about quote for a larger order of over 25 pieces if we can throw in and see if this can come down a bit if you guys are keen, doesnt take too many of us wanting them to use 25 devices only just over 6 boards. i'll keep the offer open for a week before I finalize the order with them for my own, so you can let me know by PM and we'll go from there, but again unless there is overwhelming interest I wont bother with a full blown GB thread, as I dont expect there will be that many of you keen.

neb001 got your PM mate, should be fine, they will be matched in pairs closer than quads, until I see the spread I cannot guarantee an 8 way match to a really high degree, will get as close as I can with what I have, but the 4 x pairs will be matched well as I can. hope that makes sense

Last edited by qusp; 2nd November 2010 at 07:36 PM.
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Old 2nd November 2010, 08:39 PM   #582
opc is offline opc  Canada
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Hi Guys,

Definitely focus on grouping into pairs, since it's the pair in the diff pair arrangement where you see the advantage in distortion cancellation.

I had quite good matching in my set, and I only had to test 11 devices to get two pairs that were very closely matched in both TC and VDS.

Cheers,
Owen
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Old 2nd November 2010, 08:50 PM   #583
neb001 is offline neb001  United States
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Quote:
Originally Posted by qusp View Post
neb001 got your PM mate, should be fine, they will be matched in pairs closer than quads, until I see the spread I cannot guarantee an 8 way match to a really high degree, will get as close as I can with what I have, but the 4 x pairs will be matched well as I can. hope that makes sense
I don't need an 8 way match, pairs would be just fine for me
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Old 2nd November 2010, 09:30 PM   #584
qusp is offline qusp  Australia
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cool thats what I figured would be the case. i'm off to bed, night guys. maybe when I wake up there will be some juicy pics
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Old 2nd November 2010, 10:05 PM   #585
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qusp - If you have any left, I'd be interested in one set a fets matched in pairs please.

Cheers - Pierre
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Old 2nd November 2010, 10:12 PM   #586
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qusp

I sent a PM requesting fets and 400 ohm Rs for two boards as I am building a dual mono. I thought I had better post here as well to reserve a place in the line as you mentioned that matched pairs might already be running low.
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Old 2nd November 2010, 11:11 PM   #587
qusp is offline qusp  Australia
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guys, best to use PM or email qusp (scrat) optusnet (grot) com (spot) au rather than cluttering up the thread. could everyone who has posted in here and hasnt PM'd or emailed me do so so I have it on record. got your email Stephen will get back to you later today, there is no rush, but as they take 3 weeks for production (they are made custom) I figured I would wait till tuesday next week and then send off the final order (although its all teed up), unless those interested get in contact really soon I could push it forward. I'm talking R's here that is, the fets are on the way, but wont be here for a week or 2 and i'm moving next week/weekend and need time to set up the workshop again. that should work out pretty decent timing anyway, but many more fets i'l have to think about, perhaps another 2-3 sets I can agree to until I see what the spread is. I'm sure there will be a few more than that, though not heaps more, but cant commit to more till I know.

i'm off to bed but all good at this stage....really

Last edited by qusp; 2nd November 2010 at 11:13 PM.
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Old 3rd November 2010, 04:51 PM   #588
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Hey guys,

Finally I got a source for Caddock MP930 400R at near 9€00 each & they have a stock of 23 resistors, link here:

RESISTORS Power resistors 30W 0.02Ω to 1KΩ heatsink mount resistor MP930 series
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Old 3rd November 2010, 05:36 PM   #589
Yunick is offline Yunick  Sweden
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Elfa.se also have e few MP930 in stock at 4,5€.
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Old 3rd November 2010, 06:11 PM   #590
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Elfa.se also have e few MP930 in stock at 4,5€.
Well done, that's our forum spirit
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