Yes, ZV4, page 3:
http://www.firstwatt.com/pdf/art_zv4.pdf
"Digikey doesn’t have 5 pF caps anymore, but I have listed 10 pF
parts in the parts list. You can buy 2 and put them in series to form
a 5 pF capacitor. Alternatively, you can twist two fine insulated
wires (like those used in wire-wrap construction) together at a
length of about 1.5 inches and get about 5 pF. This technique
has the advantage that you can start out too long and trim it with a
pair of scissors while watching the square wave of the amplifier."
http://www.firstwatt.com/pdf/art_zv4.pdf
"Digikey doesn’t have 5 pF caps anymore, but I have listed 10 pF
parts in the parts list. You can buy 2 and put them in series to form
a 5 pF capacitor. Alternatively, you can twist two fine insulated
wires (like those used in wire-wrap construction) together at a
length of about 1.5 inches and get about 5 pF. This technique
has the advantage that you can start out too long and trim it with a
pair of scissors while watching the square wave of the amplifier."
Finished it less than a hour ago.
Still processing it.
It's the one with the blue button on the front.
I'll take more pictures when I put it back on the bench.
The matched quad p-ch jfets were 11.4 idss and the ccs jfet is 10.4 idss.
Is that a big problem?
When setting the offset, I had to make micro adjustments as the offset would jump in large increments. The trimmer is 10k. Used four semi-south R100.
Listening to it now and beginning to see what all the fuss is about.
Still processing it.
It's the one with the blue button on the front.
I'll take more pictures when I put it back on the bench.
The matched quad p-ch jfets were 11.4 idss and the ccs jfet is 10.4 idss.
Is that a big problem?
When setting the offset, I had to make micro adjustments as the offset would jump in large increments. The trimmer is 10k. Used four semi-south R100.
Listening to it now and beginning to see what all the fuss is about.
Attachments
It's working.
First, Patrick thanks for putting this together and for Mr Pass for letting it happen.
Also, I very much like the screw connections. Negates the need to find odd connectors and it's a solid connection.
Really happy to finally getting to hear a J2. Sim, clone, exact copy or not, doesnt matter, it is a special amp.
Thank you Zen Mod for the trimmer value, setups like a champ!
The offset was dropping as the amp warmed up. Nice!
Thank you,
Vince
First, Patrick thanks for putting this together and for Mr Pass for letting it happen.
Also, I very much like the screw connections. Negates the need to find odd connectors and it's a solid connection.
Really happy to finally getting to hear a J2. Sim, clone, exact copy or not, doesnt matter, it is a special amp.
Thank you Zen Mod for the trimmer value, setups like a champ!
The offset was dropping as the amp warmed up. Nice!
Thank you,
Vince
