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Post subject: Problem with the reverb of a Blues Deville
Posted: Mon May 08, 2017 1:15 pm
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Hi!!
I have a problem with the reverb of my Blues Deville amp. Well, when I'm playing through the clean channel and turn up the reverb control, the reverb starts coupling. It's strange because when I change to drive mode the coupling stops and reverb sounds good, it also sounds good through the Power Amp In.
I have change the first preamp tube, which is supposed to be the one of the clean channel, and nothing's happened. I don't think this come from the reverb tank, but I have to check it.
Somebody have had the same problem? What do you think is causing the problem? I think maybe some capacitor from the clean part of the board, could it be?
Thanks!


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Post subject: Re: Problem with the reverb of a Blues Deville
Posted: Tue May 09, 2017 1:55 am
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Joined: Fri Feb 05, 2010 4:31 am
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Never heard about that issue but there are few relays ( electrical switch ) to switch between Clean and Drive channels which could be defective or some broken solders on circuits boards.


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Post subject: Re: Problem with the reverb of a Blues Deville
Posted: Wed May 10, 2017 5:29 am
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It could be a microphonic tube. You can use one known-good 12AX7, to substitute each remaining preamp positions, V2 and V3. Output tubes are less likely, but can be microphonic also.

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Post subject: Re: Problem with the reverb of a Blues Deville
Posted: Sat May 13, 2017 1:06 am
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Well, it's strange but the problem's gone. I just changed the tube positions of all of them and change the tank reverb. I don't really know if it was the tank or the tubes but I didn't have time to check it slowly.
The problem now it's a Vox AC30 which have the same stranger thing but changing tubes order or the tank reverb don't work this time.


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