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Old 25th March 2020, 01:43 AM   #2951
6L6 is offline 6L6  United States
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Pearl Two
The ground is on one of the RCA leads. Normal for as Rega.

What’s you turntable resting on? What cartridge are you using? You are either picking up some resonances back into the table or you have a bad compliance mismatch which is resonating in the arm.

Your previous phonostage most likely had a subsonic roll-off to stop the woofer pumping.
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Old 25th March 2020, 02:58 AM   #2952
lacrossebowe8 is offline lacrossebowe8  United States
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The turntable is on a marble bakers board which is on top of a built in cabinet. The speakers rest on the tile floor in front of this cabinet. I am just using the cartridge that came with the table which is the Rega Carbon. I did not have the woofer pumping issue with the bellari which does have a subsonic roll off filter but i usually did not have that switch engaged. Either way my woofers don't pump when using that pre-amp.
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Old 25th March 2020, 04:58 PM   #2953
Abrandt is offline Abrandt  Sweden
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I have had the same problem and it turned out to depend on a bad mix of to heavy/stiff PU and to lightweight arm. (Denon DL103 SME 3009 improved).
I suppose that it is the same om different records, so it's not a wobbly one that causes it.
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Old 25th March 2020, 05:00 PM   #2954
McQuaide is offline McQuaide  United States
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Quote:
Originally Posted by lacrossebowe8 View Post
The turntable is on a marble bakers board which is on top of a built in cabinet. The speakers rest on the tile floor in front of this cabinet. I am just using the cartridge that came with the table which is the Rega Carbon. I did not have the woofer pumping issue with the bellari which does have a subsonic roll off filter but i usually did not have that switch engaged. Either way my woofers don't pump when using that pre-amp.
It could be that the better bass extension of the Pearl 2 is exposing other issues. The Pearl 2 does have a low frequency rolloff.
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Old 25th March 2020, 05:06 PM   #2955
codyt is offline codyt  United States
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Quote:
Originally Posted by lacrossebowe8 View Post
The turntable is on a marble bakers board which is on top of a built in cabinet. The speakers rest on the tile floor in front of this cabinet. I am just using the cartridge that came with the table which is the Rega Carbon. I did not have the woofer pumping issue with the bellari which does have a subsonic roll off filter but i usually did not have that switch engaged. Either way my woofers don't pump when using that pre-amp.
Is in an extremely consistent pumping, or does it change a bit with the record? Mine was extremely consistent and always started at a precise volume level. FWIW, I didnít change anything with my player to resolve the problem. For mine, it was a combo of the extra gain and some poor grounding on my part that seemed to make it happen. As mentioned, I went through all of the grounding and lowered the gain a little, which ultimately seemed to resolve the problem. Itís very possible that I simply Ďmutedí the problem and didnít fix it, but like you it was a new problem that came with building the Pearl. I had experienced rumble/wobble in the past, and this was different.
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Old 25th March 2020, 05:08 PM   #2956
codyt is offline codyt  United States
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I also added the input resistor zobel, which may have helped. Thanks again to 6L6 for helping with that!
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Old 25th March 2020, 05:09 PM   #2957
McQuaide is offline McQuaide  United States
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I was listening to a high-end system in an audio shop (Luxman and Devore) and the woofers on the Devores were pumping between tracks. Hitting the low cut stopped the pumping but we preferred the sound without it.
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Old 25th March 2020, 11:08 PM   #2958
lacrossebowe8 is offline lacrossebowe8  United States
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So far I have only tried one record but there is no noise when no record is playing. The woofers also pump on the runout groove.

Codyt - how did you change up your grounding setup?
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Old 25th March 2020, 11:31 PM   #2959
codyt is offline codyt  United States
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Originally Posted by lacrossebowe8 View Post
So far I have only tried one record but there is no noise when no record is playing. The woofers also pump on the runout groove.

Codyt - how did you change up your grounding setup?
I found an error in how Iíd wired the safety bridge in the PSU chassis and fixed that. Then I scuffed up the anodized aluminum case in a few places where panels, Star ground, etc come together. I also had used a bit of shielding for my power wires in the RIAA case, and it ended up causing more harm than good.

No mods really, just trying to optimize the grounding as much as I could. Out of curiosity, if you turn your volume all the way up, is the Pearl still quiet? Any hum, white noise, etc?
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Old 26th March 2020, 10:30 PM   #2960
lacrossebowe8 is offline lacrossebowe8  United States
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When I turn the volume all the way up there is a fair amount of hum. I cannot really hear it at my normal listening level which is not even at one quarter volume. A few things I have tried:

Moved signal and power wires closer to the chasis floor - minimal difference
Tried floating the ground wire in the phono section - made the hum louder
Since I am still testing the pre-amp, I didn't have the chassis cover on. Adding it made little difference.
I tried picking it up and moving it around which changed the hum, for example if I put it on top of my tube amp's power transformer, the hum increases substantially.

Should the pre-amp be dead quiet even at full volume on my integrated? Thanks again for all the advice from everyone in the thread.
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