Tube amp

[Gary Steele]

Fairly new amp. When I turn it on it usually within a few minutes make a popping noise and then loses volume and get real fuzzy then it will pop back on. I tried new cables. I put another rectifier tube in. And thought it may be my power supply for telonics pedal. It still does it.
Thanks for any help. Its a 89 L.W.

[Donny Hinson]

When it loses volume, hit it hard on the top with your fist. Any noise or change means a loose tube or connector, or possibly a cold solder joint in the amp. And if hitting the amp doesn't make any noise or change, it's probably a bad cap or resistor (a thermal problem) that's failing when the amp heats up.

(A 1989 model is 37 years old, so it's an OLD amp.)

[Jack Hanson]

(A 1989 model is 37 years old, so it's an OLD amp.)

Since Phil Bradbury has marketed Little Walter amps only since 2008, it's not that old.
"89" is a model number.

https://www.littlewaltertubeamps.com/89.html

[Gary Steele]

Yes it's not very old.

[Glenn Stanfield]

Fairly new amp. When I turn it on it usually within a few minutes make a popping noise and then loses volume and get real fuzzy then it will pop back on.

What's it do after this?
What's your experience with electronics (edit: ...electronics REPAIR)?

A tube could do this, if you have more tubes try replacing them one at a time.

[Brint Hannay]

I second Donny's suggestions. I had a long battle with a Blackface Fender that did just what you describe. Changed all the tubes, cleaned all the pots and jacks, no luck. I finally found it was a bad solder joint in the driver section.