F5 with 2SK2013/2SJ313 - Page 20

juma · 23rd March 2011, 05:45 PM

The most linear region for these JFETs is near the Idss. I usually use them at 70-90% of Idss. That should not worry you - if you are afraid that your JFETs dissipate too much power, you can easily decrease the power supply voltage to +/-15V.

Using higher Idss JFETs won't bring improvement in this case.

crt · 11th July 2011, 04:02 AM

Only get this so far

Still waiting for J313/K2013 and heatsink of course

ps
Can this Amp drive Electrostatic Headphone ?

crt · 23rd July 2011, 09:38 AM

Well after some "trouble", finally finished this up
here some picture

Result
This amp just give me a BIG SMILE
Thank's Juma for replying my PM many times

juma · 23rd July 2011, 11:29 AM

You are welcome! I'm glad you like it

Nice job, BTW

CeeVee · 23rd July 2011, 12:07 PM

Very nice work CRT....congrats

Nelson Pass · 23rd July 2011, 09:25 PM

Oooooooooooo.....

Shiny.

pmchoong · 26th July 2011, 02:22 PM

What is the reason for lots of small capacitors instead of just a few bigger ones?

CeeVee · 02:32 PM

Looks nice and neat, cheap (a lot of small ones are cheaper than one big one ....and a more flexible layout possibilities! ), FC ( i might be wrong but those look like panasonic FCs ) don't come in BIG packages.....

would be my reasoning.

pmchoong · 26th July 2011, 02:45 PM

Okay. I thought there might some kind of sonic improvement using lots of smaller caps instead of few larger ones.

EUVL · 26th July 2011, 03:14 PM

> Looks nice and neat, cheap, FC don't come in BIG packages..... would be my reasoning.

You forgot one very important one -- much higher total ripple current.
Suggest you also read how the slit foil caps work.

Patrick

26th July 2011, 02:23 PM	#198
CeeVee diyAudio Member Join Date: Dec 2006	Looks nice and neat, cheap (a lot of small ones are cheaper than one big one ....and a more flexible layout possibilities! ), FC ( i might be wrong but those look like panasonic FCs ) don't come in BIG packages..... would be my reasoning. Last edited by CeeVee; 26th July 2011 at 02:32 PM.

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23rd March 2011, 05:45 PM	#191
juma diyAudio Member Join Date: Nov 2005 Location: Zemun	The most linear region for these JFETs is near the Idss. I usually use them at 70-90% of Idss. That should not worry you - if you are afraid that your JFETs dissipate too much power, you can easily decrease the power supply voltage to +/-15V. Using higher Idss JFETs won't bring improvement in this case.

11th July 2011, 04:02 AM	#192
crt diyAudio Member Join Date: Apr 2007	Only get this so far Still waiting for J313/K2013 and heatsink of course ps Can this Amp drive Electrostatic Headphone ?

23rd July 2011, 09:38 AM	#193
crt diyAudio Member Join Date: Apr 2007	Well after some "trouble", finally finished this up here some picture Result This amp just give me a BIG SMILE Thank's Juma for replying my PM many times

23rd July 2011, 11:29 AM	#194
juma diyAudio Member Join Date: Nov 2005 Location: Zemun	You are welcome! I'm glad you like it Nice job, BTW

23rd July 2011, 12:07 PM	#195
CeeVee diyAudio Member Join Date: Dec 2006	Very nice work CRT....congrats

23rd July 2011, 09:25 PM	#196
Nelson Pass The one and only Join Date: Mar 2001	Oooooooooooo..... Shiny.

26th July 2011, 02:22 PM	#197
pmchoong diyAudio Member Join Date: Jan 2008 Location: Kuala Lumpur	What is the reason for lots of small capacitors instead of just a few bigger ones?

26th July 2011, 02:45 PM	#199
pmchoong diyAudio Member Join Date: Jan 2008 Location: Kuala Lumpur	Okay. I thought there might some kind of sonic improvement using lots of smaller caps instead of few larger ones.

26th July 2011, 03:14 PM	#200
EUVL diyAudio Member Join Date: Oct 2003	> Looks nice and neat, cheap, FC don't come in BIG packages..... would be my reasoning. You forgot one very important one -- much higher total ripple current. Suggest you also read how the slit foil caps work. Patrick