Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

Foo Off-Topic chit chat with no general subject.

User Tag List

Thread Tools Search this Thread
Old 10-20-13, 11:12 AM   #1
Unique Vintage Steel
Thread Starter
cuda2k's Avatar
Join Date: May 2005
Location: Allen, TX
Bikes: Kirk Frameworks JKS-C, Serotta Nova, Gazelle AB-Frame, Fuji Team Issue, Schwinn Crosscut, All-City Space Horse
Posts: 11,486
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Vintage audiophiles - lend me your brains (difficulty Yamaha CR-840)

Quick back story - wife inherited a turntable and receiver from her father who passed about a year ago. We had been thinking there was a problem with the turntable because the left channel was silent when the receiver was in stereo mode, but played when set to mono. Turns out after hooking up an ipod to the aux in, it's the receiver, not the table that is the issue.

So, the unit is a Yamaha CR-840, a bit of internet research has turned up that these have an IC pre-amp chip that was proprietary to this series of Yamaha receivers and there appears to be no replacement part for it out there. Trying to determine if that is the issue we have, of if something else could be a more likely culprit that is worth investigating.


1) left channel near-silent when set to Stereo (I can hear something on the speaker if volume cranked up and balance set to full-left side)
2) can get plenty of sound out of both sides when receiver is set to mono
3) issue is the same when listening to both phono and aux inputs (haven't tested the radio as of yet)

So... thoughts?
cuda2k is offline   Reply With Quote
Old 10-20-13, 07:27 PM   #2
Junior Member
Join Date: Aug 2005
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have one of these. Same problem. It's been sitting for 20 years in my basement. I think they can be fixed as I called an old fashioned repair place that fixes old tvs and stereos. Never went any further then that as I bought a new receiver.
Not as good as the Yamaha.
TrailDogger is offline   Reply With Quote
Old 10-28-13, 08:06 PM   #3
Senior Member
late's Avatar
Join Date: Oct 2002
Location: Southern Maine
Posts: 8,500
Mentioned: 45 Post(s)
Tagged: 0 Thread(s)
Quoted: 5477 Post(s)
If you can find a good repair guy he MIGHT be able to replace the op amp with something
similar. Problem is, the repair could easily cost more than it's worth.

Start looking for another used amp or receiver.

You also might want to take it to a shop to make sure it's the op amp and not
just a bad connection. It happens.
late is offline   Reply With Quote

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

All times are GMT -6. The time now is 01:20 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    get answers from real people!
Click to start entering your question.