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May 21, 2022, 12:18:29 AM

Author Topic: Right channel noisy. Help troubleshooting  (Read 2192 times)

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Offline denti alligator

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Re: Left channel out. Help troubleshooting
« Reply #90 on: December 31, 2021, 08:52:00 AM »
Again, I’m giving up. I can’t see where this is coming from. If I jab every single terminal, plus some of the wires, plus some of the resistors and capacitors and it makes no difference; if I re-flow almost every connection and the right side and it makes no difference; I don’t see what else to do. I guess I could switch out the sockets for the 2A3 tubes and see if it changes channels. I’m getting to the point of frustration—and also totally bummed to be throwing a small NYE party with no music.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline denti alligator

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Re: Left channel out. Help troubleshooting
« Reply #91 on: January 01, 2022, 08:42:30 AM »
Happy New Year!

I’ve got my PayPal invoice to send this to you, Paul, but want to give you a chance to weigh in one last time after hearing the recording (posted on previous page). Let me know if there’s any last-minute tests you think might help locate the source of this problem. Otherwise, I’ll pay the invoice and initiate the repair shipment. Thanks!
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Paul Birkeland

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Re: Left channel out. Help troubleshooting
« Reply #92 on: January 01, 2022, 08:57:27 AM »
I still believe it's a loose connection with the realistic possibility that when it gets here it makes no noise in my workshop.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline denti alligator

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Re: Left channel out. Help troubleshooting
« Reply #93 on: January 01, 2022, 10:06:39 AM »
And most likely it is, but damned if I can’t locate it. Would you suggest trying to swop out the tube sockets? If the noise moves channels, we’d at least know it’s something there.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Paul Birkeland

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Re: Left channel out. Help troubleshooting
« Reply #94 on: January 01, 2022, 11:36:07 AM »
I think if you tried to remove the tube sockets, you'd probably damage one in the process to the point where it would no longer be useful, so you'd be worse off than you are now.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline denti alligator

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Re: Left channel out. Help troubleshooting
« Reply #95 on: January 01, 2022, 12:13:05 PM »
Too late, unfortunately. And I have to say, the socket on the right doesn’t look good. One of the pins drops down into the socket all the way. The other socket looks good. I’ve done the desoldering and hardware exchange. I’ll resolder
 after dinner and report back. If the noise moves channels I might as well start by replacing the socket.
« Last Edit: January 01, 2022, 01:01:20 PM by denti alligator »
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline denti alligator

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Re: Left channel out. Help troubleshooting
« Reply #96 on: January 01, 2022, 12:59:29 PM »
That was a bunch of work for nothing!  Switched out the sockets and the noise is still in the same right channel.

There’s no way you won’t hear this, Paul. I’m very curious to know the source and am very happy for your help on the way and your repair expertise!

Thank you. I’m paying for the shipping box now.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Paul Birkeland

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Re: Left channel out. Help troubleshooting
« Reply #97 on: January 01, 2022, 01:10:28 PM »
I appreciate your willingness to spend some time on your end before sending it out.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline denti alligator

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Re: Left channel out. Help troubleshooting
« Reply #98 on: January 01, 2022, 02:13:57 PM »
I’m very grateful for your patience troubleshooting with me, especially during the holiday week.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Paul Birkeland

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Re: Left channel out. Help troubleshooting
« Reply #99 on: January 27, 2022, 06:40:10 PM »
I finally had some bench time to explore this repair.  The noise was absolutely there, so Denti isn't crazy.  I ended up shorting stages to chase the noise and it was present even with the 2A3 grid shorted on the channel, so that localized it to a very specific spot.  When I was looking around there, I noticed this crazy green corrosion on the tube socket, and I could poke around with my meter and measure some substantial DC voltage crawling around on the surface of the ceramic, so out that went and in went a new tube socket and all is well.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline denti alligator

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Re: Left channel out. Help troubleshooting [resolved]
« Reply #100 on: January 28, 2022, 02:13:09 AM »
Paul,

This doesn’t make sense, because one of the things I did during troubleshooting is to switch out the L and R tube sockets! The sound was still there, but only in the right channel.

I’m totally confused. Though I also have no idea what that green stuff is.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Doc B.

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Re: Left channel out. Help troubleshooting [resolved]
« Reply #101 on: January 28, 2022, 05:00:45 AM »
Did you perhaps use alcohol to clean the contacts at some point? I could imagine the water content of rubbing alcohol creating the corrosion.
Dan "Doc B." Schmalle
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Bottlehead Corp.

Offline denti alligator

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Re: Left channel out. Help troubleshooting [resolved]
« Reply #102 on: January 28, 2022, 05:13:08 AM »
No, I only used DeOxit.

And to clarify: I *swopped* the sockets (I didn't replace one). I wanted to see if the noise would travel with the socket. It didn't! Which is why Paul's solution doesn't make sense to me (though if it's quiet, who am I to complain?).
« Last Edit: January 28, 2022, 05:14:51 AM by denti alligator »
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline denti alligator

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Re: Left channel out. Help troubleshooting
« Reply #103 on: January 28, 2022, 10:15:55 AM »
The noise was absolutely there, so Denti isn't crazy.

I'm starting to think I am crazy! Seriously. The only thing I can imagine is that I somehow mixed up L and R speaker wires after I swapped the sockets. In fact, if Paul is only hearing noise in the left channel then this *must* be what happened. There is no other logical explanation. The socket was the issue and when I swapped them the noise went with it, but I didn't notice because I had mixed up the speaker wires...

The thing is: I'm pretty sure I didn't mix up the wire. In fact, I tried it on a couple speakers, so I would have had to mix up the wiring twice. Actually three times, because I tested right before packaging it up to send to Paul.

Paul, can you definitely reassure me there was only noise in one channel?

- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Paul Birkeland

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Re: Left channel out. Help troubleshooting [resolved]
« Reply #104 on: January 28, 2022, 10:39:46 AM »
I only heard the noise in one channel.  I also mix up speaker wires and RCA plugs when trying to sort stuff like this out, so what you're experiencing is not that inconceivable.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man