Amp Camp Amp - ACA - Page 76

zany · 25th January 2013, 08:42 AM

nice work... good to see wood used. cheers.

JRKO · 25th January 2013, 10:13 AM

my woods skills are low, my metal skills are non existent!

wood it is

Nisbeth · 26th January 2013, 12:14 PM

Any updated ETA on new boards?

/U.

lhgin · 7th February 2013, 04:18 AM

eagerly waiting for the boards & kits...

Congo5 · 16th February 2013, 06:24 PM

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

Loudthud · 17th February 2013, 01:56 AM

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.

thomasnadeau · 18th February 2013, 10:51 PM

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)

erix · 19th February 2013, 12:02 AM

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?

6L6 · 19th February 2013, 12:13 AM

Order genuine ones here FET Audio | Hi-End Audio Projects Spencer is a member of this forum.

erix · 19th February 2013, 01:55 AM

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?

25th January 2013, 10:13 AM	#752
JRKO diyAudio Member Join Date: Dec 2003 Location: U.K.	my woods skills are low, my metal skills are non existent! wood it is __________________ 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

19th February 2013, 12:02 AM	#758
erix diyAudio Member Join Date: Dec 2002 Location: Bush's Kingdom	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?

19th February 2013, 12:13 AM	#759
6L6 diyAudio Member Join Date: Oct 2010 Location: Denver, Colorado	Order genuine ones here FET Audio \| Hi-End Audio Projects Spencer is a member of this forum. __________________ llustrated Build Guides - Pass Pearl 1 - Pass B1 - - Pass F5 - Pearl 2 - -O2 HPA - - Pass F4

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25th January 2013, 08:42 AM	#751
zany diyAudio Member Join Date: Oct 2010	nice work... good to see wood used. cheers.

26th January 2013, 12:14 PM	#753
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	Any updated ETA on new boards? /U.

7th February 2013, 04:18 AM	#754
lhgin diyAudio Member Join Date: Jun 2003 Location: Penang	eagerly waiting for the boards & kits...

16th February 2013, 06:24 PM	#755
Congo5 diyAudio Member Join Date: Jun 2012	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

17th February 2013, 01:56 AM	#756
Loudthud diyAudio Member Join Date: Nov 2007 Location: Near Dallas Texas USA	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.

18th February 2013, 10:51 PM	#757
thomasnadeau diyAudio Member Join Date: Jan 2010	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)

19th February 2013, 01:55 AM	#760
erix diyAudio Member Join Date: Dec 2002 Location: Bush's Kingdom	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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