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Mo-fi Ultradeck owners - popping noise from speaker upon power off

Guys, I got a mo-if ultradeck with mastertracker cartridge and I have a problem that I cannot figure out. When I turn the power switch off, I get a loud pop through my speakers. If turn the volume down or switch to another channel, then obviously I do not hear it.

I got the player replaced with another new unit and the same thing. I have tried everything - that I can physically do, replace power cord, hook up power cord to a different outlet, using different phono preamp, etc.

Does anyone else experience this? My other Project Classic SB TT does not have this at all in the same system.

I have searched the whole internet and found one post on Stevehoffman forum about experiencing the same and that person did all sorts of experimentation to no avail.

https://forums.stevehoffman.tv/threads/popping-on-power-down.1000508/

A $2500 player should NOT have issues like this. Period.
dandaroy

Showing 1 response by oldhvymec

oldhvymec
5,101 posts
 
The key is the little shock, when you touch the tonearm... the black wire mentioned was NEVER figured out... Where is it grounded.

TT pops can drive you nuts.. I thought it took a resistor to dump a cap to remove noise, when shutting down... Either the resistor is bad OR it doesn't have one hooked up, IN THE RIGHT path when shutting the switch OFF, It may be there in the on position, but gone when you flip the switch, to the OFF position. 

You follow my reasoning?It's there but need a jumper or maybe moved to a different common location, to dump the cap that's discharging.. when you flip the switch..

I don't turn switches off when I'm in concert, It just doesn't happen...
VERY bad practice. 30 min motor warmup, and the TT may not get turned off for a week at a time..

My units have platter breaks and litteral gear shifters, to engage and disengage, the platter or the motor.. 

Volume is always turned down...with an LP flip. ALWAYS.. Dual TT roll one down, and roll one up at the same time,  that is DJ 101. Blow the speaker up doing that.. Drop an arm with the volume up.. LOL BAMB... Folks will want their money back...

Regards
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