Voyager Volume Decay Control Issue

Tips and techniques for Minimoog Analog Synthesizers
Post Reply
prog_keys
Posts: 18
Joined: Wed May 05, 2010 1:25 am

Voyager Volume Decay Control Issue

Post by prog_keys » Wed Feb 23, 2022 10:17 pm

Hi all,

I pulled my Voyager out today for the first time in a year or so to have a jam on.

Everything seemed to be fine but after playing for a while I noticed that I was getting weird volume drops on notes while playing. Notes would become very quiet and then back to normal volume completely randomly.

I think I traced the issue to the Volume ADSR Decar control. Turning the control to zero I didn’t have any of the volume drop issues, as soon as I turned up the control they started again.

I haven’t previously had a problem with the envelopes on my Voyager. I have had the main board replaced as mine was one of the models that had IC issues originally.

Not really sure what’s causing it and kinda bummed as I was looking forward to playing in it again. Any advice appreciated!!

User avatar
RL
Posts: 760
Joined: Wed May 19, 2004 4:17 am
Location: http://www.moogmusic.de/
Contact:

Re: Voyager Volume Decay Control Issue

Post by RL » Fri Feb 25, 2022 6:18 am

Hi,
if U13 (LM339) on the analog board is still a Texas Instrument chip replace it.
http://www.moogmusic.de/index2

prog_keys
Posts: 18
Joined: Wed May 05, 2010 1:25 am

Re: Voyager Volume Decay Control Issue

Post by prog_keys » Fri Feb 25, 2022 6:27 pm

Thanks! I’ll open it up and and take a look!

prog_keys
Posts: 18
Joined: Wed May 05, 2010 1:25 am

Re: Voyager Volume Decay Control Issue

Post by prog_keys » Fri Feb 25, 2022 7:31 pm

RL wrote: Fri Feb 25, 2022 6:18 am Hi,
if U13 (LM339) on the analog board is still a Texas Instrument chip replace it.
Had a look and it’s a definitely a Texas Instruments LM339N! Even though I’ve had the analog board replaced under warranty, this chip could be the issue?

Thanks!

User avatar
RL
Posts: 760
Joined: Wed May 19, 2004 4:17 am
Location: http://www.moogmusic.de/
Contact:

Re: Voyager Volume Decay Control Issue

Post by RL » Sat Feb 26, 2022 4:59 am

last week I had the same issue on a Voyager on my desk and it was that chip.
http://www.moogmusic.de/index2

prog_keys
Posts: 18
Joined: Wed May 05, 2010 1:25 am

Re: Voyager Volume Decay Control Issue

Post by prog_keys » Sat Feb 26, 2022 7:49 am

RL wrote: Sat Feb 26, 2022 4:59 am last week I had the same issue on a Voyager on my desk and it was that chip.
Cool! What did you replace it with? Seems like the TI version is out of stock just about everywhere!

Thanks again!

Post Reply