Start up - loud hissing sound - from my tube amp
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theblueark
New member
Tubes need time to warm up. That's what the standby switch is for.
1. Leave at standby
2. Turn power switch on
3. Go get yourself a beer
4. Turn standby on and start chugging
1. Leave at standby
2. Turn power switch on
3. Go get yourself a beer
4. Turn standby on and start chugging
fibredrive
New member
did you just change the tubes? i used to have that problem (despite leaving on standby etc) but its ok now. but occassionally, my amp does produce some "watery echo" sound when i flick the standby on. any ideas? am using a 3 pin plug btw..
Could be bad tube/s inside. If you use the amp almost everyday for about a year, some tubes could have worn out. Other than that, it require a repairman attention. I suggest you send it back to davis for a service call.
Tube amps are pretty organic in nature. It require some form of constant upkeep and maintainence.
Tube amps are pretty organic in nature. It require some form of constant upkeep and maintainence.
the amp is less then 2 month old....
AMp sound normal when in playing condition --
Ya - it sound like after all the noise had been discharge when i switch off the stand by switch .........
After that then i m able to play and sound right...
will try to check what when wrong again -- over the weekend
AMp sound normal when in playing condition --
Ya - it sound like after all the noise had been discharge when i switch off the stand by switch .........
After that then i m able to play and sound right...
will try to check what when wrong again -- over the weekend
Last edited:
celahircelebrindal
New member
Hi feedback...i had this problem some time back.Did the hissing/whistling sound became louder as the tubes get hotter?
I emailed Marshall Tech support then and ....as you know they arent really responsive bunch and helpful either.....but i came across an article from their website on power tubes and pre-amp tubes.....titled Valve Life and Replacement.I know you mentionthat your amp is 2 mths old but perhaps the tubes are bad/faulty in this case i think its the pre-amp tubes..i quote from the article:
So maybe you might wanna give that a try if there are no avenues.From the article it also explains how to identify if the power tubes are the ones that are faulty.Bottom i include the link and maybe you might wanna try and read it up.Good luck feedback.....
- Valve Life Replacement
I emailed Marshall Tech support then and ....as you know they arent really responsive bunch and helpful either.....but i came across an article from their website on power tubes and pre-amp tubes.....titled Valve Life and Replacement.I know you mentionthat your amp is 2 mths old but perhaps the tubes are bad/faulty in this case i think its the pre-amp tubes..i quote from the article:
So maybe you might wanna give that a try if there are no avenues.From the article it also explains how to identify if the power tubes are the ones that are faulty.Bottom i include the link and maybe you might wanna try and read it up.Good luck feedback.....
- Valve Life Replacement
ungauged
New member
You have a very very tricky problem on your hands.... It's like when your computer crashes.... It could be anything inside that's not working.... Could be the RAM, processor, mother board or even the power supply! Good luck on your quest, you have my sympathies as I can't help.
Hydesg
New member
did it swap the whole set with a new one, or you just changed their position?
celahircelebrindal
New member
Did it blow your HT fuse?
If it doesnt....then its unlikely the power tubes...
Have you tried changing the whole set of pre-amp tubes.Thats what i did when it happened to me......i bought a new set of 12AX7 Tungsol, all was well no hissing/whistling sound whatsoever.The following week i changed to a new set of power tubes and it sounded great..
Last edited:
Phil
New member
I used to have hissing and crackling on my tube amp as well. Especially when I turn the volume knob on my guitar, it's as if I'm frying keropok.
What I did was to use some electrical contact cleaner on the tube-pins as well as on all my contacts, such as the cable jacks. But the main thing is the tube-pins. I read it off eurotubes.com, and here is the link: H-SPHERE
Here is a short exerpt;
"This next tip is the MOST important of all. Whether your amp is old or new you should always clean the tube sockets before installing new tubes and we HIGHLY recommend doing this! Failure to do this can and often will cause you to burn out tubes and here is why. The pins on tubes are all different just like a fingerprint so when you remove an old tube and replace it with another tube the pins will contact the socket collars in a slightly different location. Cleaning the sockets can easily be done by spraying electrical contact cleaner on the pins of one of your old tubes or preferably the new tubes, and working the tube in and out of each socket a few times. Do this for both preamp and power tubes. If you do not have any contact cleaner, then at the very least you should work each new tube in and out of it's socket a few times to help scrape in a decent connection."
It worked for me, the noise disappeared, and I am real satisfied. I understand that your amp is not exactly brand-new, nor have you changed the tubes recently, but I hope this helps. If you've time to spare, look around the eurotubes website's FAQ and other articles. They are pretty infomative.
What I did was to use some electrical contact cleaner on the tube-pins as well as on all my contacts, such as the cable jacks. But the main thing is the tube-pins. I read it off eurotubes.com, and here is the link: H-SPHERE
Here is a short exerpt;
"This next tip is the MOST important of all. Whether your amp is old or new you should always clean the tube sockets before installing new tubes and we HIGHLY recommend doing this! Failure to do this can and often will cause you to burn out tubes and here is why. The pins on tubes are all different just like a fingerprint so when you remove an old tube and replace it with another tube the pins will contact the socket collars in a slightly different location. Cleaning the sockets can easily be done by spraying electrical contact cleaner on the pins of one of your old tubes or preferably the new tubes, and working the tube in and out of each socket a few times. Do this for both preamp and power tubes. If you do not have any contact cleaner, then at the very least you should work each new tube in and out of it's socket a few times to help scrape in a decent connection."
It worked for me, the noise disappeared, and I am real satisfied. I understand that your amp is not exactly brand-new, nor have you changed the tubes recently, but I hope this helps. If you've time to spare, look around the eurotubes website's FAQ and other articles. They are pretty infomative.
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