Marantz 1060 pre out problems

M

mdc701

Active Member
Hello,

I’ve been using my 1060 as preamp to a model 15 power amp. Recently the right channel became problematic - sound is intermittent. Sometimes its crackly, sometimes its fine, and sometimes it has a really weak signal (very faint music playing). I switched the rca plugs in the power amp side and the problem switched sides. So I’m guessing the preamp section of the 1060 is the problem. When I use the jumper plugs and operate the 1060 as an integrated, the problem goes away. Anyone have the same experience/problem as this? Thanks in advance to your replies.

ps. Sometimes when the problem persists, a simple power off/on of both amps fixes the right channel signal. And then the problem comes back either a few minutes or hours into the session or when the amps are powered on for the first time during a new session.
 
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Even though it works with the jumpers installed, I would start with a good Deoxit cleaning of all of the controls. Intermittent crackly sounds often end up being a dirty control.
 
If I remember right, there are a couple, maybe 1 per channel?, transistors on the line stage board that can go noisy or fail. Its been awhile since I restored a couple of these 1060's, but I think it's the '458''s. The 1030 used around six of those transistors on the tone and phono board. But I seem to remember having only two used in the 1060 on the line stage board. But before yanking and replacing signal transistors, caps, etc., try pushing the filter buttons back and forth also. See it that does anything. That circuit is right in the signal path between the preamp section and amp section.
 
Agree with Steven. Clean all controls first. My 1060 needs regular cleaning of the volume pot to stay quiet. And when I first acquired it, I was told that "one channel was out". The only issue with it was that the volume pot needed to be cleaned!
 
The Dill said:
Does it happen when all the different input sources are selected? Phono, tape, aux, etc.?
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I tried the aux input and the problem was still there. Last night I had a good 2 hours of uninterrupted listening after having the problem early on. It’s really confusing. I’ll try cleaning the volume and balance knobs later and see if that improves or solves the problem. Thanks everyone for your replies.
 
mdc701 said:
I tried the aux input and the problem was still there. Last night I had a good 2 hours of uninterrupted listening after having the problem early on. It’s really confusing. I’ll try cleaning the volume and balance knobs later and see if that improves or solves the problem. Thanks everyone for your replies.
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The input select switch and, really, all of the pushbutton switches need it too. Especially the Tape Monitor and Mono switches. All of these can drop a channel intermittently if they have dirty contacts. They may not be the problem, but they need to be ruled out.
 
Steven Tate said:
The input select switch and, really, all of the pushbutton switches need it too. Especially the Tape Monitor and Mono switches. All of these can drop a channel intermittently if they have dirty contacts. They may not be the problem, but they need to be ruled out.
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So the problem came back. I’m gonna try as Steven suggested. Another question, if the problem lies in dirty contacts in the switches, is it normal that the crackling sound stays consistent in the right channel?
 
mtflycaster said:
Agree with Steven. Clean all controls first. My 1060 needs regular cleaning of the volume pot to stay quiet. And when I first acquired it, I was told that "one channel was out". The only issue with it was that the volume pot needed to be cleaned!
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Have you tried aittle Fader Lube after cleaning the volume control? Its worked well for my 1060.
 
mdc701 said:
So the problem came back. I’m gonna try as Steven suggested. Another question, if the problem lies in dirty contacts in the switches, is it normal that the crackling sound stays consistent in the right channel?
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It definitely could. It could have decent contact on one channel of the switch and bad contact on the other. Be sure and do the Input Select switch, Tape Monitor and Mono switches at a minimum. Open it up to get access (unplug the unit), and pack paper towels around the area you are going to spray. It will save a lot of cleanup. Work the switches many times after spraying. If you do all of this, and it doesn't help, it will be time to look for bad components or bad internal connections like cracked trace, bad solder joint, etc.
 
Thanks guys! Will try to work on the contacts this weekend. I’m hoping the problem is solved by cleaning them.
 
mdc701 said:
Thanks guys! Will try to work on the contacts this weekend. I’m hoping the problem is solved by cleaning them.
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It needs to be done anyway. If it doesn't fix the problem, see Eastpoint's post above. That would probably be my next step too.
 
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