2. amps-preamps
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Speaker noise after tube amp shut down

Last night when I shut down my tube amp I have noise in one speaker.
This hapen about 20-30 seconds after I power down my amp and last about 10-20 seconds. Today I experiance same.
What you think happend? Bad tube?
Everithing is find when amp is up and playing!
Thank you!
ilidra

Showing 5 responses by ilidra

ilidra OP
21 posts
 
Last night it hapend same, agan noise from speaker after I powered down amp. Maybe litle louder, I'm not shure.
Amp is 5 years old, heavly moded Jolida 502.
Thank you
ilidra OP
21 posts
 
Last nigh I swap speaker cables and interconections from preamp and this eliminate speaker or preamp. Also plug diferent power tubes and problem is same. Only thing wich I didn't is to change preamp and driver tubes. I will swap them tonight and see.
Thanks!
ilidra OP
21 posts
 
Noise is like bzzz ing for about 20 sec.
First after powering amp down speaker is quite for about 20-30 sec and after that start like bzzzzz noise for 15-20 sec.
Thank you!
ilidra OP
21 posts
 
I did't swap speaker cables yet but I will tonight. Right now I'm not home.
Power tubes are KT88, NOS Genelex Gold Lions.
I will let you know how swaping going.
Thank you!
ilidra OP
21 posts
 
Finally I found problem.Problem is bad preamp Brimar 4004 tube.When I pluged different preamp tubes no problem at all.After I power down my amp my speakers are quite like should be.
Thank you all for yours inputs!
Ilija
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