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Advent 5002 - Low, rolling distortion hum (left channel) + bonus problem

mr_soju

mr_soju

New Member
A friend of mine gave me a pair of Advent 5002s that I'm very grateful for.. They needed a refoam and I did that. I hooked everything up and they do work. Refoam a success. However, the left channel is causing this weird, low rolling distortion hum. I can't explain it too well, but the music is barely audible with this low, rolling distorted hum. I switched inputs and the speaker worked fine on the right channel. I tried this on my Realistic STA-2280 that I had serviced a couple years ago and a new power supply was put in.

So this got me thinking and I switched out the Realistic STA-2280 with my Fischer CA-800. Same issue - low, rolling distortion/hum with music barely audible. Plug it into the right channel and it works fine.

But what's weird is while I'm trying to troubleshoot this, my Pioneer SP-BS22-LR work perfectly fine with the left channel. Perhaps the lower wattage compared to the Advent is making it work OK. FM/AM works, Aux works.

This is all running through a Technics MK5. I'm swapping out the Shure M97xE needle for one of the last ones ever produced this weekend. That's long overdue.

Any thoughts on this?

I'm no stranger to channel issues. They are the bane of my existence with vintage gear.

Bonus Question: I was an idiot while trying to troubleshoot the issue and while pulling the stuffing out the speaker (carefully I might add), the yellow tweeter wire got caught and separated from the tweeter. How can I repair that? Soldering? The spot where the wire meets the tweeter looks like it was capped/pushed on, but I'm not really sure. I can add a picture if necessary.
 
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So you only hear distortion when listening to records? It sounds like a problem with your turntable. Have you tried swapping the cables on the TT? I'd also check the ground cable for good contact with your receiver.
 
crazy-in-az said:
So you only hear distortion when listening to records? It sounds like a problem with your turntable. Have you tried swapping the cables on the TT? I'd also check the ground cable for good contact with your receiver.
Click to expand...

Sorry, I wasn't clear. Even with the AUX, FM, etc. going through the Advent, I get the distortion. However, both channels are clear and work when I run my TT / AUX / Radio through the Pioneer bookshelf. I've tried to narrow it down between the Advent and the Technics. My TT does need to be serviced as I've noticed some grounding issues after a recent apartment move. I haven't tried swapping cables on the TT.
 
try a different receiver/source.
it may be that the much larger advent woofer is picking up electronic type noise that the smaller woofer cant.
 
crazy-in-az said:
So you only hear distortion when listening to records? It sounds like a problem with your turntable. Have you tried swapping the cables on the TT? I'd also check the ground cable for good contact with your receiver.
Click to expand...

I'm thinking acoustic feedback from the turntable.

The reason the Pioneer doesn't have an issue, is that it doesn't have as much low bass response as the Advent (the Advent goes low enough in frequency response to react with the turntable at a super low frequency, whereas the Pioneer doesn't).

I'd put the turntable in a different location, or put something heavy and solid under the turntable, to see if that makes any difference, Even something like a brick under each turntable foot would probably be enough to upset the feedback loop, for a temporary test...

Regards,
Gordon.
 
GordonW said:
I'm thinking acoustic feedback from the turntable.

The reason the Pioneer doesn't have an issue, is that it doesn't have as much low bass response as the Advent (the Advent goes low enough in frequency response to react with the turntable at a super low frequency, whereas the Pioneer doesn't).

I'd put the turntable in a different location, or put something heavy and solid under the turntable, to see if that makes any difference, Even something like a brick under each turntable foot would probably be enough to upset the feedback loop, for a temporary test...

Regards,
Gordon.
Click to expand...

The more I think about this, the more I think it is my TT. I've noticed some serious hum when moving the tonearm, so there's a grounding issue somewhere. I never would have thought this would transfer all the way to the Advent though. I just moved into a new apartment and I've been slowly setting up the stereo, so this issue hasn't been on the forefront of my mind.

Thanks Gordon. I appreciate it.
 
moebuster said:
-AND check the wire connectors between the cart and the tonearm end.
Click to expand...

Yes. Totally. I remember putting the cart on for the first time ever and sweating over those connections. Thanks.

Side note, did you take a look at my bonus question at the bottom of my post? The brass rivet in the tweeter terminal (yellow wire) popped out and there's no way to reconnect it. I tried searching AK or Google for examples on how to repair it, but I got nothing. Thoughts? I *think* I can solder it back on there, but I don't know if there's a better way.
 
If I'm not too late: It appears the male part of the quick connect was pulled off a post that was part of the terminal to the voice coil lead.
I haven't worked with this particular tweeter, but judging by the picture the male quick connect was essentially riveted to the terminal.
If this is the case, pull the male quick connect from the female. Position the male on the post and carefully solder in place.
It would help if you can do a more detailed picture .
 
Guido57 said:
If I'm not too late: It appears the male part of the quick connect was pulled off a post that was part of the terminal to the voice coil lead.
I haven't worked with this particular tweeter, but judging by the picture the male quick connect was essentially riveted to the terminal.
If this is the case, pull the male quick connect from the female. Position the male on the post and carefully solder in place.
It would help if you can do a more detailed picture .
Click to expand...

Hey! Thanks for replying! I actually got it fixed by a professional. There was no way in hell I was going to solder that myself with zero experience and how small the broken terminal was. I brought it to a guy in Chicago called Stereo Rehab. Totally legit repair place and he's (Caspar) been around in that location under that name for only a couple years. He told me to bring it in after an email and fixed it for free. Yes, free. What was really awesome and I'm appreciative for was he walked me through the repair in person and in real-time. If he can diagnose and repair simple issues like mine, he's more than willing to look at your equipment. Larger, more labor intensive repairs will need an estimate and turnaround time. Anyway, after the tweeter fix, he hooked it up, blasted some tunes through it, and off I went.

So, the tweeter has been fixed, the cabinet is in working order, and sounds incredible.

As for the low rumble, I think I figured that our as well. After reading a lot and not realizing this could be a problem, I unhooked and reset the entire cartridge from the tonearm. Deoxit the connections and screwed everything back in. Apparently, that's a common issue with the 1200. That solved the rumble issue. I figured the connection just wasn't solid. I also swapped out my Realistic STA 2280 that's just been giving me some issues with the left channel.
 
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