I power down ST-70 then pre-amp then phono pre. A few seconds later I hear a short buzz? in the left speaker. Any ideas of possible cause?
4 posters
VTA-ST-70 noise after power down
fzapped- Posts : 7
Join date : 2018-05-19
Bob Latino- Admin
- Posts : 3280
Join date : 2008-11-26
Location : Massachusetts
fzapped wrote:I power down ST-70 then pre-amp then phono pre. A few seconds later I hear a short buzz? in the left speaker. Any ideas of possible cause?
After you power down the amp wait about 30 seconds before you power down the pre and phono pre. It takes about 30 seconds for the B+ power caps to lose their stored charge.
Bob
Corona, DavidR and Tom Pickett like this post
Brap- Posts : 234
Join date : 2013-11-28
Age : 69
Location : Plainfield, illinois
I typically press the mute switch on my preamp then turn the VTA off. No buzzing.
peterh- Posts : 1870
Join date : 2012-12-25
Location : gothenburg, sweden
I made the whole procedure automatic with an arduino that controls SSR relays.Brap wrote:I typically press the mute switch on my preamp then turn the VTA off. No buzzing.