Disconnect the turntable ground and see if it happens. Next try a different cartridge. Very Weird. It has to be sending a signal through the ground assume your volume is all they way down when it is all the way down. Is there any signal at all with the volume all the way down. If there is just a little it is the cartridge.
Anyone have this turntable issue?
Whenever I set my cartridge on the record, I hear a loud pop. This is with the volume turned down all the way. It seems to be the stylus entering the groove. I have done everything to avoid static in the system. I'm quite sure it is not static. Just one loud pop when the cartridge is lowered. No problems after that. I cannot imagine how that impulse noise gets to the speaker with zero gain on the preamp/processor. How can this happen?!
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@almarg Did you look through the owner manual of the SME V arm? Check out "515 Audio Lead" found on page 12. https://sme.co.uk/audio/wp-content/uploads/sites/1/2016/12/SME-series-v-instructions.pdf I assume the OP connected the single ground from the arm 5 pin din connector cable to the ground lug on each phono amp. I assume there is no other grounding connections from the arm. Only the connection from the arm to the two phono preamp’s ground lug. Sutherland DUO Phono amp http://www.audiophilia.com/reviews/2018/1/25/sutherland-engineering-duo-phono-stage The units came with a few hours on them with loading/gain set at 47/40, the default, which worked well for my Phasemation PP-2000 MC Phono Cartridge. Loading/Gain adjustment is easy and accessed by unscrewing the top plates. Don’t forget to set loading and gain values the same on each chassis.Is it possible the OP has the gain set too high on the phono preamps? If we are to assume the problem is not caused from static electricity then it must be signal voltage generated from the stylus hitting, contacting, the groove of the record. Is the loud POP heard through both the left and right speakers? That might be good to know. Is it possible the POP voltage gain is large enough it is over driving the Line input circuitry of the Bryston SP3 preamp? http://www.bryston.com/products/digital_audio/SP3.html I assume the volume control on the Bryston preamp is not a motorized pot. Some how the high gain voltage POP is getting past the volume control circuitry and getting to the power amp’s inputs. Jim |
Jim (Jea48), thanks for providing the links. Not sure if you noticed that the OP is using a step-up transformer between the turntable and the dual chassis Sutherland phono stage, with the phono stage presumably being used in moving magnet mode. Here is the manual for the step-up: https://www.ortofon.com/media/148266/ortofon-st-7-userguide01_web01.pdf It shows that a single ground wire should connect the turntable to the ground terminal on the SUT, and another ground wire should be connected from that terminal to the phono stage. Which in this case would mean that a single wire should be used to connect that terminal of the SUT to the ground terminals of both phono stage chassis. Before commenting further I'll await the OP's response to the questions that have been raised since his last post, as well as confirmation of how the ground connections are implemented between the turntable, SUT, and phono stage. Best regards, -- Al |
Thanks Al (almarg). Here is what the SP3 manual says about the volume control. Page 5 D: VOLUME CONTROL / ROTARY ENCODER Continuous rotary optical encoder for determining volume level as well as an input for most variable settings and other selections within both the System and Source menus.http://www.bryston.com/PDF/Manuals/300024[SP3].pdf Do you know how those things work? Is it possible a high level POP voltage spike would cause the circuitry for the volume control to screw up and pass the spike through onto the gain section of the preamp and out the outputs while still maintaining its’ minimum level setting? Maybe a dumb question I wonder what would happen if the OP set the SP3 to a different Line level input and then conducted the same test. Nothing should happen right? No POPPING sound through the speakers, right? That is unless somehow the POP voltage spike is traveling on the signal ground. Could that even happen? The signal ground is not part of the circuitry of the volume control. Correct? Jim |
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