Zen vs ZV9

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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:

http://www.passdiy.com/pdf/ZV9.pdf

As yet another alternative if you don’t 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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