Using opa2134pa in denon PMA1560 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 5th December 2009, 01:29 PM   #1
diyAudio Member
Join Date: Nov 2009
Location: Hoorn
Default Using opa2134pa in denon PMA1560

Hello guys,

I hope you can help me.

Is it possible in a denon PMA1560 to use the opa2134pa as replacement of njm2082d op-amp

Service manual:

DENON_PMA-1560_SM.pdf - Windows Live

Regards Rick...
  Reply With Quote
Old 5th December 2009, 11:27 PM   #2
diyAudio Member
Join Date: Nov 2009
Location: Hoorn
Nobody who knows it?
  Reply With Quote
Old 5th December 2009, 11:49 PM   #3
diyAudio Member
Join Date: Nov 2009
Location: Los Angeles
I'd say it should be fine but I'm not sure why you'd bother. The OPA is a little quieter and no faster than the NJM2082. At best I expect to be no different.

  Reply With Quote
Old 6th December 2009, 12:16 AM   #4
kaos is offline kaos  United States
diyAudio Member
Join Date: Dec 2005
Location: Los Angeles
I would expect it to work quite well.
  Reply With Quote
Old 6th December 2009, 12:37 AM   #5
diyAudio Member
Join Date: Nov 2009
Location: Hoorn
OK thank you guys, this amp have 2 defect op-amps on both channels.
Last week they send instead of njm2082d 4x lmt2904. People say to me here on this forum that the lmt2904N (lm2904) i think is a low budget op-amp.

A lot of people say that the opa2134 is a really good op-amp.

So it`s no any problem to use them?

And another little question. On this channels there where 3x 2sa1142 (P) or (Q) burn out.
I will to replaced them with mje350, do you think this is a good choice.

Regards Rick...
  Reply With Quote
Old 6th December 2009, 09:09 PM   #6
diyAudio Member
Join Date: Apr 2009
The op-amps is in the optical bias adjust circuit and i would guess that you could change them to almost anything.
The "green" NEC 2sa1142 are located in the audio path and you could mess up the original sound if switched to something else.
2sa1142 are available but not the NEC NOS green ones.
Swap to any 2sa1142 is my recommendation.
I own 2 of these pma-1560īs.
The circuitboards arenīt complete identical between the amplifier boards.
my board numbers are 2229210006 and 2229210103.
Biggest pain with repairing these amplifiers is that you have to redo all soldering.
2 out of every 10 soldering joint are bad.
On both of amplifiers the front leds had to be resoldered.
Itīs very important to check the bias both at idle and with 10mv 1khz because with the later you adjust the class-a bias and that is important because the amp switches back to class a/b when input signal goes over a cirtain level.
With proper adjustment you remain in class a as long as possible.
When these amps are fully working you have some nice sound capabilities.
Newer amplifiers uses more output devices to draw low impedance speakers.
I checked the schematics on the PMA-2000R but canīt say that i am impressed.
When it comes to sound iīm biased to sanken bjtīs.(cant explain why!)

  Reply With Quote
Old 8th December 2009, 07:00 PM   #7
diyAudio Member
Join Date: Nov 2009
Location: Hoorn
HI, i have 6 new 2sa1142 from inchange semidonductor.

The original 2sa1142 from nec is 10Watt.

The sa1142 from inchange have the same spec`s, only this one is 8Watt.

Gives it any troubles with a heatsink on it, and sound they just the same as the originals.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Denon PMA1560 schematic? roger-k Solid State 9 4th October 2010 09:27 PM
Denon dp-59l MrBurd Analogue Source 0 15th January 2009 10:16 PM
Fs: Opa2134pa A'af Swap Meet 0 10th April 2008 12:29 PM
Fs: Opa2134pa Zodiac Swap Meet 1 21st February 2008 03:52 PM
Fs: Opa2134pa gengis Swap Meet 11 8th July 2006 09:43 PM

New To Site? Need Help?

All times are GMT. The time now is 11:28 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Đ1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2