Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Which OP in Clearaudio Basic
Which OP in Clearaudio Basic
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
Reply
 
Thread Tools Search this Thread
Old 1st October 2014, 03:34 PM   #1
arvid is offline arvid  Sweden
diyAudio Member
 
Join Date: Oct 2014
Default Which OP in Clearaudio Basic

Greetings.

I'm repairing a friend's Clearaudio Basic. One of the OPs needs to be replaced. The DIL-8 case is scrubbed and the label is unreadable. Does anyone know which OP is used in Clearaudio Basic?

Regards,
Arvid
  Reply With Quote
Old 1st October 2014, 03:56 PM   #2
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Which OP in Clearaudio Basic
Keeping my fingers crossed that you can get the appropriate information, but knowing whether or not the op-amp is a single or dual would be helpful in the event that you need to substitute something else.

How about some pictures? (Post here using advanced mode / browse / upload)
__________________
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
  Reply With Quote
Old 2nd October 2014, 07:02 AM   #3
arvid is offline arvid  Sweden
diyAudio Member
 
Join Date: Oct 2014
Ok here's a couple of PCB shots. I have to double check but I think V+ is on pin 7.
Attached Images
File Type: jpg WP_20141001_19_02_16_Pro.jpg (438.1 KB, 145 views)
File Type: jpg WP_20141001_19_02_25_Pro.jpg (389.5 KB, 143 views)
  Reply With Quote
Old 2nd October 2014, 07:59 AM   #4
arvid is offline arvid  Sweden
diyAudio Member
 
Join Date: Oct 2014
Correction: I checked the PCB and the V+ goes to pin 8. V- is pin 4, you can see this on the close up image, pin 4 goes to bare wire jumper to the left which is V- out on the 7918 DC/DC converter.

This review is talking about the Clearaudio Basic+ (I have the Basic) and Burr-Brown OP amps. Perhaps the Basic is using a OPA2134? At least the V- and V+ pins match the PCB layout. Not sure about the rest.
  Reply With Quote
Old 2nd October 2014, 08:24 AM   #5
tomatamot is offline tomatamot  Netherlands
diyAudio Member
 
Join Date: May 2006
Location: Rotterdam
Did you ask Clearaudio?
  Reply With Quote
Old 2nd October 2014, 09:18 AM   #6
arvid is offline arvid  Sweden
diyAudio Member
 
Join Date: Oct 2014
I have asked (today) yes. No reply yet. Maybe they are reluctant to tell since they've scratched the labels on the casings. So far, I've found the following candidates:

OPA2134 (JFET)
NE5532 (Bipolar)
OPA275 (Hybrid?)
  Reply With Quote
Old 8th October 2014, 06:47 PM   #7
arvid is offline arvid  Sweden
diyAudio Member
 
Join Date: Oct 2014
Clearaudio response: -"Please send your unit to us for repair."
  Reply With Quote
Old 8th October 2014, 06:51 PM   #8
arvid is offline arvid  Sweden
diyAudio Member
 
Join Date: Oct 2014
The transformer, one voltage regulator, one op amp and the power indicator LED (!) were all toast. All replaced (including an opa2134) and electrically all seem to be fine.

Now my friend just needs to listen...
  Reply With Quote
Old 8th October 2014, 06:54 PM   #9
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Which OP in Clearaudio Basic
Any idea what caused the failure in the first place? Nearby lightning strike perhaps?
__________________
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
  Reply With Quote
Old 8th October 2014, 06:56 PM   #10
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Which OP in Clearaudio Basic
With pin 8 as plus they are duals (as your likely list shows). OPA2604 is a good performer and pretty universal. For a bjt type it has to be the LM4562

Change both opamps so you keep L and R identical, maybe fitting sockets so you can have a play later.

A tip for removing them from double sided print. Snip each leg and remove the opamp. Then heat and pull each remaining pin from the PCB. Then use a piece of stainless wire to run through the hole (solder won't take to stainless) and use braid to clean up the excess solder. Clean with ISO and it should look like new.
  Reply With Quote

Reply


Which OP in Clearaudio BasicHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Clearaudio BASIC Service Manual wanted aire Analogue Source 3 2nd October 2014 02:20 PM
Basic op amp question Tube Noob Chip Amps 3 22nd November 2011 05:03 PM
Basic op amp optical compressor questions LarsXI Solid State 0 1st July 2008 11:32 PM
Clearaudio NANO mods tomstearns Analogue Source 1 10th November 2007 07:45 PM
Basic question about choosing op amps leadbelly Solid State 1 18th February 2004 08:21 PM


New To Site? Need Help?

All times are GMT. The time now is 05:54 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki