Weird noise from Crack amp

[Exist1214]

I've been running into this same problem again, but I cleaned the pins again about 1.5 weeks ago and the noise has already returned.
Is there something else that could be causing this? Any other tests I can perform to see if the tube is still OK?

Thank you

[oztayls]

Here’s a tip for cleaning valve pins that is gentle and quick. Stab the tube pins into a Chux Magic Eraser pad a few times. (Can be any brand of magic eraser pad of course!)

Because I own a little yacht that is permanently moored at the coast, I’m never without a product called Deoxit. If I don’t use this stuff, the electronics starts playing up. After cleaning the pins with the magic eraser, spray them with Deoxit and then stab the pins into a second magic eraser pad to remove excess product. Let dry and you’re good to go.

On old vintage tubes the pins are often crusted with a greenish oxide. I find the best way of dealing with that is to stand the tubes in vinegar or citric acid for an hour or two. Then rinse off with water followed by the magic eraser and Deoxit treatment.

[Exist1214]

Here’s a tip for cleaning valve pins that is gentle and quick. Stab the tube pins into a Chux Magic Eraser pad a few times. (Can be any brand of magic eraser pad of course!)

Because I own a little yacht that is permanently moored at the coast, I’m never without a product called Deoxit. If I don’t use this stuff, the electronics starts playing up. After cleaning the pins with the magic eraser, spray them with Deoxit and then stab the pins into a second magic eraser pad to remove excess product. Let dry and you’re good to go.

On old vintage tubes the pins are often crusted with a greenish oxide. I find the best way of dealing with that is to stand the tubes in vinegar or citric acid for an hour or two. Then rinse off with water followed by the magic eraser and Deoxit treatment.

Sorry about that - I did not get any notification for your reply.
I will have to try the method you explained above. I don't live in a particularly humid environment and my pins don't have anything that resembles a greenish oxide - they are quite shiny with some tiny scratches after cleaning with a Scotchbrite pad a couple times.
 

[2wo]

I find Scotchbrite to be very effective, might be time to look elsewhere. If it's as humid as you say maybe there's some crud in the socket. Try inserting and removing the tube 5 times or so and see if you can feel if any of the contacts doesn't feel tight.

Probably a good idea to reflow the socket connections...John