Marsh headphone amp from Linear Audio - Page 27

sonidos · 14th June 2012, 02:06 PM

Quote:

Originally Posted by jackinnj

I thought I had posted this -- 2N5460 is available from Mouser. They have a couple hundred in stock.

I missed that, thanks! Well, on the other jfet I guess I go for the Chinese jfets and cross my fingers!

sonidos · 14th June 2012, 05:28 PM

Update: I just purchased the 2n2547 jfets from Tayda2009 on ebay, since they have a good rep. After I get all the parts in, I'll report if I had any problems with matching or Idss.

rjm · 15th June 2012, 04:25 AM

Quote:

Originally Posted by coluke

open loop performances of the DB-CM-DB architecture are quite amazing

Under simulation at any rate, my results bear this out 100%.

RNMarsh · 15th June 2012, 05:08 PM

Quote:

Originally Posted by sonidos

Update: I just purchased the 2n2547 jfets from Tayda2009 on ebay, since they have a good rep. After I get all the parts in, I'll report if I had any problems with matching or Idss.

Is there a compliment to the 2N2547?

RNMarsh · 15th June 2012, 05:12 PM

Quote:

Originally Posted by rjm

Under simulation at any rate, my results bear this out 100%.

There is some gain there... Not optimized... should have lower distortion. Remove R6 and then it will be open-loop and then retest.

Telstar · 15th June 2012, 05:54 PM

Quote:

Originally Posted by RNMarsh

Is there a compliment to the 2N2547?

psst... Complement. You do this mistake in the article too.
Jan, note it for reprint

jan.didden · 15th June 2012, 05:59 PM

Yeah, I missed it!

sonidos · 15th June 2012, 06:10 PM

Quote:

Originally Posted by RNMarsh

Is there a compliment to the 2N2547?

It must be the day for typos. I meant 2N5457.

coluke · 15th June 2012, 11:20 PM

It seems that NTE457/NTE460 by NTE Electronics are equivalent to 2N5457/2N5460 - Newark has a few of them in stock.

L.

jackinnj · 16th June 2012, 12:44 AM

Lots of devices will work on the front end -- but be mindful of the pinouts! I will try on Sunday. I have some sk170gr/j74gr matched up.

15th June 2012, 05:59 PM	#267
jan.didden diyAudio Member Join Date: May 2002 Location: Great City of Turnhout, Belgium Blog Entries: 6	Yeah, I missed it! __________________ /Yes! Its out: Linear Audio Vol 5! I'm not an "accademic", just a plodder who loves a challenge - Ian Hegglun

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14th June 2012, 05:28 PM	#262
sonidos diyAudio Member Join Date: Jul 2007 Location: Round Rock, TX	Update: I just purchased the 2n2547 jfets from Tayda2009 on ebay, since they have a good rep. After I get all the parts in, I'll report if I had any problems with matching or Idss.

15th June 2012, 11:20 PM	#269
coluke diyAudio Member Join Date: Mar 2009	It seems that NTE457/NTE460 by NTE Electronics are equivalent to 2N5457/2N5460 - Newark has a few of them in stock. L.

16th June 2012, 12:44 AM	#270
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Lots of devices will work on the front end -- but be mindful of the pinouts! I will try on Sunday. I have some sk170gr/j74gr matched up.