@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
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
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