Happy B-day Mr. dB

[Mr. dB]

Db what kind of plans do you have for your birfday?

work

 

[Mr. dB]

Happy B-Day bro, for a gift - I need help fixing a tube amp.

What's wrong with it?

 

[Johnny Cakes]

What's wrong with it?

after about 10 minutes, it starts howling at me - is that pre-amp tubes or power?

 

[string_bean00]

happy birthday homie!

 

[Mr. dB]

after about 10 minutes, it starts howling at me - is that pre-amp tubes or power?

Sounds like a preamp tube to me, probably at the front end. Try tapping on them with a wooden pencil and see if one is more microphonic than the others.

 

[Johnny Cakes]

Sounds like a preamp tube to me, probably at the front end. Try tapping on them with a wooden pencil and see if one is more microphonic than the others.

what do you mean? when it is on? how will I know...
thanks.

 

[Mr. dB]

Yes, when the amp is on. You'll be listening for any unusual noises through the speaker when you tap the tubes with the pencil. If they have metal shields on the, you'll need to remove those first.

 

[Johnny Cakes]

Yes, when the amp is on. You'll be listening for any unusual noises through the speaker when you tap the tubes with the pencil. If they have metal shields on the, you'll need to remove those first.

thanks, I'll do it and let you know, why don't you stop by and help me?

 

[MichaelScott]

acquoustic guitar rulez, just saying

 

[Johnny Cakes]

acquoustic guitar rulez, just saying

I've got 3, a Martin, Taylor and Ibanez (electric/acoustic)