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Old 30th December 2008, 07:23 PM   #11
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So,no need for matching?
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Old 30th December 2008, 07:25 PM   #12
Magura is offline Magura  Denmark
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Originally posted by meanman1964
So,no need for matching?

Originally posted by Magura

There is only one per channel.

Everything is possible....to do the impossible just takes a little while longer.
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Old 30th December 2008, 07:54 PM   #13
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Thanks Nelson and Maqura for your answer.I still have a few questions.First question how critical is the value of C8?I only find 22pF original it is 20pF.I also couldn't find for R1,2 and 3 the 2 ohm/3Watt mox,1,8 ohm and 2,2 ohm isn't a problem.
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Old 30th December 2008, 08:40 PM   #14
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Not a problem. If you search, you should also find a post showing
adjustment of the power resistor values versus Idss of the JFET
for minimum distortion.

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Old 31st December 2008, 02:46 AM   #15
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Default Adjust R3

I couldn't find the post, but I did find the information in the ZV9 article on www.passdiy.com - page 9 of 10 in the following:


As yet another alternative if you donít want to test the devices, I recommend that you simply select R3 so that the Vds of the JFET in the amplifier is 2.5 volts with the output DC figure of 23 volts. More often than not, this is close to the sweet spot.
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