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[gg85]

Hi,
I'm very grateful for your help!
Something strange happened this morning: turned on my ADA, switched to a program with voicing set to "dist" and it started playing at a low volume, but gradually the volume started to increase and the distortion became more and more high until it reached a good level.
Now I'm very confused..
I don't know if the next time I will use the ADA it will works. Are you still convinced the problem could be caused by the tubes or could it be something else?

Thank you

Giulio

[MarshallJMP]

Could be something else but again my first impression is the tubes or one of them.

[Harley Hexxe]

MJMP,
Doesn't this symptom sound like a restriction in the voltage supply to the tube(s)?

Giulio,
What happens if you switch to another distortion program when it comes up to volume? Does it go to that program and play at full volume or does that gradually swell up to volume too?

[rnolan]

It could be as simple as some dust in the socket causing some resistance that comes and goes.  Hence my suggestion to pull the tubes out and back in a couple of times, may just fix it? and is free and easy to try.

[MarshallJMP]

MJMP,
Doesn't this symptom sound like a restriction in the voltage supply to the tube(s)?

That's my second guess.

[gg85]

Hi everybody,
I'm very sorry for no response from last times.
I'm very gratefull for helping me.

MJMP,
Doesn't this symptom sound like a restriction in the voltage supply to the tube(s)?

Giulio,
What happens if you switch to another distortion program when it comes up to volume? Does it go to that program and play at full volume or does that gradually swell up to volume too?

If the volume goes down and I switch to another program the volume still go down.
Finally, good news. I changed the tubes, not by myself but with the help of an expert. He said me that the tubes were gone. It was strange because were good quality tubes. After the replacement the problems disappeared. Now it's almost a month from the replacement and works perfectly.

Thanky you very much guys!

[Dante]

Could be something else but again my first impression is the tubes or one of them.

Listen to that intuition, it serves you (and us) well 

[Harley Hexxe]

Giulio,

It's possible to buy new tubes these days and still get bad ones right out of the box. I never buy them from music shops for that reason, and this is also the reason many of them have a "no return" policy for tubes.

I'm glad your issues have been solved

[MarshallJMP]

I strongly agree with Harley.

[Dante]

+1

got a brand new set of bad power tubes online

[Harley Hexxe]

Let me guess, Musician's Friend?

I got a bad pair of Mullards from them several years ago.

[Dante]

Nope, Amazon....stay away

Two leaky tubes, one bad, one good. A matched quad of TADs

My tech told me what was happening & put Svetlanas in - all good now

[Harley Hexxe]

Thanks for the heads up!

   But then again, Amazon and ebay, are really about the same in the sense that you could be getting them from anywhere or anyone, unless it's specified from a dealer. Even then, you'd have to know the dealer's reputation.

    Musician's Friend, (until it comes to tubes), definitely not a good place to buy.

    Sweetwater, I got good Gold Lion tubes from them, but the Mullards I got were borderline.

    I'm going to give TAD a try direct, and I'll give Antique Electronic Supply a try at them, although they are more transparent about their tube sales. They admit they don't test or sort them out to make matched sets. So I guess that's to be expected online?

[MarshallJMP]

Well I used to buy all my tubes from doug's tubes, both new and NOS and never had any problems. Now with all the EU import s**t it became too expensive which is a shame.

https://dougstubes.com/

[Harley Hexxe]

Yeah, he's been kind of pricey for the last several years