Home › Forums › Help/Technical Questions › “Clock Noise” on Deluxe Memory Man
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May 26, 2009 at 3:47 pm #78298JimmyKMember
Does anyone else have problems with “clock noise” on the Deluxe Memory Man? It’s a high pitched sound – fairly subtle, some might not notice it – that occurs when the delay knob is turned clockwise past about 10:30. Is this normal, and can it be fixed with trim pot adjustment? Howard Davis has done an “alignment” but the noise is still there, so I’ve sent it back to him for another try. Maybe I’m being oversensitive to a subtle sound. I would be grateful for any feedback any of you has.
JimmyK
May 26, 2009 at 7:15 pm #97019Fender&EHX4everModeratorSome clock noise will be present at the highest delay time settings if the DMM was modded to extend the delay time beyond its factory settings. I had Howard Davis mod my 90s DMM for a longer delay time, and the repeats are definitely dirtier past 12:00 with a faint bit of clock noise. Your best bet is to use a 10 band EQ after the DMM and cut the noise out at 8khz and 16khz. I do this alot, and those particular frequencies are not necessary to my tone in most cases. In a mix, I prefer to let cymbals occupy that range.
May 26, 2009 at 7:20 pm #97020JimmyKMemberExcellent, thank you so much. That’s very helpful. I’ve never used a 10 band eq before – any suggestions on good units?
Jim
May 26, 2009 at 11:21 pm #97030Fender&EHX4everModeratorQuote:Excellent, thank you so much. That’s very helpful. I’ve never used a 10 band eq before – any suggestions on good units?Jim
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May 30, 2009 at 7:47 am #97171devnulljpParticipantQuote:Does anyone else have problems with “clock noise” on the Deluxe Memory Man? It’s a high pitched sound – fairly subtle, some might not notice it – that occurs when the delay knob is turned clockwise past about 10:30. Is this normal, and can it be fixed with trim pot adjustment? Howard Davis has done an “alignment” but the noise is still there, so I’ve sent it back to him for another try. Maybe I’m being oversensitive to a subtle sound. I would be grateful for any feedback any of you has.JimmyK
I have an old Tokai analogue delay that does that. Drives me nuts, so it just sits in a drawer. Sorry, not very helpful I know, but at least now you know you’re not alone in being bugged by that noise.
May 31, 2009 at 2:43 pm #97201Howard DavisMemberThe most common cause of clock noise is misalignment, and 9 times out of 10 doing a complete trimpot alignment using the proper lab equipment and procedure will eliminate it. Some models, due to PC board layout and lead dress, have a low level of this noise that cannot be completely eliminated. It is usually above 5 KHz or so in frequency, and there is very little if any guitar signal at or above this frequency, so the use of a filter or equalizer that cuts frequencies above 4KHz or so can eliminate it without degrading guitar tone.
Guitar pedal design engineering, repairs, and custom mods:
http://howard.davis2.home.att.net/June 1, 2009 at 3:00 am #97220devnulljpParticipantQuote:The most common cause of clock noise is misalignment, and 9 times out of 10 doing a complete trimpot alignment using the proper lab equipment and procedure will eliminate it. Some models, due to PC board layout and lead dress, have a low level of this noise that cannot be completely eliminated. It is usually above 5 KHz or so in frequency, and there is very little if any guitar signal at or above this frequency, so the use of a filter or equalizer that cuts frequencies above 4KHz or so can eliminate it without degrading guitar tone.Guitar pedal design engineering, repairs, and custom mods:
http://howard.davis2.home.att.net/Thanks Howard — I’m curious what that entails.Running a signal though it into an oscilloscope … then what ? What would you be looking for?
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