tube amp squeal...

[astrozombie]

Re: tube amp squeal...

This thread is a walker.


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[Chickenwings]

Re: tube amp squeal...

You should at least go thru all your tubes and tap them lightly with a chopstick and listen for the ping. Better still, replace all of them one at a time. Eliminate tubes as a potential source of squeal before you do anything else. Preamp tubes can go south just the same as any other tube. It happens all the time.

 

[Chickenwings]

Re: tube amp squeal...

This thread is a walker.


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lol...as in in walking dead?
derp

 

[astrozombie]

Re: tube amp squeal...

lol...as in in walking dead?
derp

Yeah that's what I meant.

zombie thread. Like the author.


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[Boogie Bill]

Re: tube amp squeal...

I have a guitar that squeals, only on the neck pickup, a G&L Legacy. Duncan SSL-2. Not the amp.

Bad pickup, right?

Changed pickups. It STILL squeals.

Put a small piece of foam weather stripping under the pickup.

Gone.

Had to be the pickguard picking up some resonant frequency.

Simple fix, give it a try.

Bill

 

[Gearjoneser]

Re: tube amp squeal...

You should at least go thru all your tubes and tap them lightly with a chopstick and listen for the ping. Better still, replace all of them one at a time. Eliminate tubes as a potential source of squeal before you do anything else. Preamp tubes can go south just the same as any other tube. It happens all the time.

At normal volume, tap on each pre tube with a pencil or chopstick, and see if any of the tubes make a loud ping. Turn it up loud, and do the same. Replace any tube that makes a loud clanking noise when you tap on it.

Besides that, Hot Rod amps aren't designed as high gain channels. The amps sound best if you use the OD channel as a gainier/louder extension of your clean channel.......as a boost. Setting it for a metal tone just gives you a muddy highgain Fender tone.

 

[beaubrummels]

Re: tube amp squeal...

all my tubes are glowing an orange-yellow color and my power tubes also glow slightly blue.

maybe I biased the amp too hot?

What I was told is that the tubes should glow more on the blue side normally. If they glow only orange/yellow, there's oxygen in the tube, which indicates the vacuum likely has been compromised.

I burned through several Marshall/Tesla EL34s this way. As far as I could tell, they were biased hot and where the metal retainer made contact with the tube, the glass developed a hairline crack. (YMMV, and I'm sure some techie on the forum will flame me with better information.)

 

[astrozombie]

Re: tube amp squeal...

What I was told is that the tubes should glow more on the blue side normally. If they glow only orange/yellow, there's oxygen in the tube, which indicates the vacuum likely has been compromised.

I burned through several Marshall/Tesla EL34s this way. As far as I could tell, they were biased hot and where the metal retainer made contact with the tube, the glass developed a hairline crack. (YMMV, and I'm sure some techie on the forum will flame me with better information.)

Seems to be an issue with the amplifier I had at the time. None of my vox amps have replicated the phenomenon.


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