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Old 25th January 2013, 08:42 AM   #751
zany is offline zany  Australia
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nice work... good to see wood used. cheers.
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Old 25th January 2013, 10:13 AM   #752
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my woods skills are low, my metal skills are non existent!

wood it is
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In the interests of full disclosure JRKO = James Rupert Kingsley Osborne. And yes, my parents will pay for it when I choose their retirement home
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Old 26th January 2013, 12:14 PM   #753
Nisbeth is offline Nisbeth  Denmark
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Any updated ETA on new boards?

/U.
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Old 7th February 2013, 04:18 AM   #754
lhgin is offline lhgin  Malaysia
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eagerly waiting for the boards & kits...
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Old 16th February 2013, 06:24 PM   #755
Congo5 is offline Congo5  United States
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While waiting for more boards, I made some of my own.
The toner transfer isn't going well for me yet so I carved some with a dremel by hand,
looks like the work of Fred Flinstone...but it works. I really want a CNC for this.

Mouser is out of the 2sk170 Toshiba's and in the F5 thread Mr Pass said the Fairchild J111 could be used.
F5 power amplifier

Is there something I have to change for it to work?
The pinout is different but I have accounted for that.
It could be something with my boards that I don't see, haven't found yet but the last set worked fine.
I ran out of the 170"s so purchased 50 of the J111's

The ACA makes a great little headphone amp, all my friends like the sound of it, the F5 is better though.

Thank you
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Old 17th February 2013, 01:56 AM   #756
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I used an MPF102. You can find them at Radio Shack. Idss was around 10mA. I would think a J111 would have too high an Idss.
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Old 18th February 2013, 10:51 PM   #757
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Eagerly awaiting more boards/kits. I want to build one of the Amp Camps with my younger son who is now getting into electronics. 8)
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Old 19th February 2013, 12:02 AM   #758
erix is offline erix  United States
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Default JFET Substitutions?

I'm finally ready to stuff the boards I got for Christmas but I've run into a snag with the input JFETs.

I've seen only the above two recommendations for subs for the 2SK170.

Can we get a list going of known acceptable substitutes?

What are the critical specs for this part in this location?
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Old 19th February 2013, 12:13 AM   #759
6L6 is offline 6L6  United States
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Order genuine ones here FET Audio | Hi-End Audio Projects Spencer is a member of this forum.
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Old 19th February 2013, 01:55 AM   #760
erix is offline erix  United States
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Well buying from overseas is one option....

Another is to use what I have:
MPF102 with Idss= 2 - 20mA
MPF4392 with Idss = 25 - 75mA
J201 with Idss = .1 - 1mA

Or if these don't work go with the recommended part:
2SK170 with Idss = 2.6 - 20mA

Or the F5 substitute:
J111 with Idss = 20mA

Based on Idss it looks like Loudthud's recommendation is the best choice but what other specs should I look at to compare?
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