Anyone have this turntable issue?

I agree with elizabeth, it has to be static.
With the volume control turned all the way down it must be a hell of a static charge.

What is the the percentage of humidly in the room?

Belt drive TT?
What material is the platter made of?

What are you using for a TT platter mat? You might try a cork one.

What method are you using to clean your records? Are you wiping them dry with a cotton cloth? That will build up a good static charge.
.

@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

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

Just a guess the mute circuity is ahead of the volume control circuitry section.
You might want to contact Byrston Tech support.  

Just curious did you try setting the SP3 to a different Line Level input and run a test?