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Old 3rd September 2008, 05:33 PM   #1
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I am having alot of trouble getting the transistors and capacitors at the moment. I will have to get them online. Can someone please tell me where I can buy these matched Jfets?

Also where do I get the 18V power supplY?
Thanks
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Old 3rd September 2008, 05:40 PM   #2
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Ebay is your mate.

As for the pot before or after the unity gain circuit, that depends on where you have the weakest situation. 90% of cases is the driving of the interconnects and main amp's input impedance without loss of signal or response deviations.
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Old 3rd September 2008, 06:19 PM   #3
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http://www.linearsystems.com/distrib...rnational.html


They do not have to be matched, but it is preferred that they are.
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Old 3rd September 2008, 06:32 PM   #4
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Quote:
Originally posted by Professor smith
a lot of trouble getting the transistors
Eeer, Gov.
As you've got your knickers in London, why not just pop over to Grandata in Wembley for the K170 ?
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Old 3rd September 2008, 06:38 PM   #5
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Quote:
Originally posted by jacco vermeulen


Eeer, Gov.
As you've got your knickers in London, why not just pop over to Grandata in Wembley for the K170 ?
I sure will. That is within walking distance.


But the trouble is, will they match them for me?
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Old 3rd September 2008, 06:42 PM   #6
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At 50P each you could ask them for a couple of the same batch run and match them in situ.
Which is what Big Daddy P sometimes does, so he says.

Goodlooking motor and nice birds on your homepage, Prof.
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Old 3rd September 2008, 06:47 PM   #7
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regarding the capacitors,( not the electrolytics), but the metalised polypropylene, what other types can I use and wat values can they be between for the 1Uf and the 10Uf?
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Old 3rd September 2008, 06:50 PM   #8
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This is turning out to not be as asimple as I thought. I dont know how to match them, I j ust wanted to buy them and solder them. What can I do?
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Old 3rd September 2008, 07:00 PM   #9
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You introduce me to Daphne, I give you 4 matched 2SK170s for free.
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Old 3rd September 2008, 07:00 PM   #10
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Buy a DMM.

You can pretty much use any cap you fancy, just not the same as a polyprop.
If you're not in a hurry and /or can shortly get by with a crappy, i'm about to order some NOS Wima MKP for 24p per uF, could send you some.
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