Minimoog hum

Pulling out your hair? Don't know what to do or where to go? Ask in here.
Forum rules
READ: VSE Board-Wide Rules and Guidelines

If your Help request has been solved, please edit your first post in order to select the Image Topic Icon to let others know your topic has been solved.
Post Reply
User avatar
elsongs
Active Member
Active Member
Posts: 354
Joined: Mon May 22, 2006 8:12 am
Location: Los Angeles
Contact:

Minimoog hum

Post by elsongs » Sun Sep 06, 2009 11:02 am

My Minimoog Model D makes a hum, not a LOUD one, but noticeable when I turn the volume up. Is this normal, or do I need to do some grounding adjustments on the thing?

User avatar
Hybrid88
Synth Explorer
Synth Explorer
Posts: 2251
Joined: Sat Jan 17, 2009 8:26 am
Gear: V-Synth, and other stuff...
Location: Australia

Re: Minimoog hum

Post by Hybrid88 » Sun Sep 06, 2009 3:29 pm

Should be in the "Help" section for future reference.

Does the mini have two or three pins on the end of the power cord? If two it needs an earth modification added, though more common with the Japanese plugs like MS-20 etc. Possibly the chassis, or seperate boards aren't correctly earthed? Or you may have a faulty component or something.

:wink:

User avatar
xpander
Synth Explorer
Synth Explorer
Posts: 1541
Joined: Sat Jun 02, 2007 7:15 am
Gear: UltraProteus, Xpander, 200e, Minimoogs, Radias, Prophet VS, PolyEvolver, Arp 2600
Location: los gatos, california
Contact:

Re: Minimoog hum

Post by xpander » Mon Sep 07, 2009 8:50 am

it is not normal, my 1970s minis have a great signal-to-noise ratio.

User avatar
Cumulus
Supporting Member!
Supporting Member!
Posts: 1834
Joined: Mon Aug 17, 2009 8:48 pm
Band: Cumulus

Re: Minimoog hum

Post by Cumulus » Tue Sep 08, 2009 1:37 am

Mine doesn't have that problem, either.

User avatar
WhinyLittleRunt
Active Member
Active Member
Posts: 478
Joined: Fri May 19, 2006 1:41 am
Location: CT

Re: Minimoog hum

Post by WhinyLittleRunt » Tue Aug 17, 2010 11:38 am

This is gonna sound really stupid, but plug it into one of those gray 2-prong adapters and then into a power strip or outlet, and see if the hum goes away. We had this issue with a Pro One and by doing this unconventional thing we resolved it...
I like vintage synths....

User avatar
Hybrid88
Synth Explorer
Synth Explorer
Posts: 2251
Joined: Sat Jan 17, 2009 8:26 am
Gear: V-Synth, and other stuff...
Location: Australia

Re: Minimoog hum

Post by Hybrid88 » Tue Aug 17, 2010 2:01 pm

WhinyLittleRunt wrote:This is gonna sound really stupid, but plug it into one of those gray 2-prong adapters and then into a power strip or outlet, and see if the hum goes away. We had this issue with a Pro One and by doing this unconventional thing we resolved it...
Must have been an earth loop, notorious for causing hum issues in audio gear - if this is the case reassess how you gear is setup plug wise, things like the order certain pieces of gear are plugged into the wall outlets may have an affect. I wouldn't recommend using a two-prong adapter unless your desperate though, by doing that you're removing the earth for the synth, so if there is a fault or short circuit inside the unit then you basically have no protection from the panel / chassis etc becoming live (something I personally wouldn't risk with a synth of that age).

Back to the original posters problem, have you had the capacitors replaced by a tech? Might be something to think about as old caps can increase noise in the circuit with age. But this problem would more be excessive noise rather than a pitched hum.

Post Reply