2. analog
  3. 161541-88353

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 yogiboy

yogiboy's avatar
yogiboy
5,812 posts
 
@dandaroy
I had the same problem with my VPI HW-19. The capacitor between the switch and the motor was the culprit. The Mo-Fi deck that you have uses the same Hurst motor as the VPI. That loud pop could damage your tweeters!
This is the motor!
http://hurst-motors.com/documents/PA_PB_Synch_DD.pdf
More to discover