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Post subject: Reverb tank issues
Posted: Wed Apr 13, 2011 10:17 am
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I just picked up a Custom Shop Fender Dual Professional. I replaced all the tubes with new and had a tech rebias it. Before I took it to the tech I replaced all the preamp tubes and the 6V6 with a 6K6 for the reverb. I then played a gig and everything was fine. I then took it to the tech and all he did was put in new power tubes and rebias. The tone is much better but now the reverb does not seem to be right. I really have to crank it to hear the reverb and it sounds very short, muffled and choppy. Not the lush sound it was before I took it to the tech. I cleaned all the jacks with contact cleaner. I removed the reverb tank, cleaned and inspected. It looked ok to me but I really don't know what to look for. The springs weren't broken. The only thing I haven't done is replace the cable from the amp to the reverb tank. I don't know if that would make a difference. I did put the original tubes back in to compare and there was no change.
Does anyone know what might be causing this? Can I just replace the reverb cables with regular RCA jacks? Thats what they look like to me.


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Post subject: Re: Reverb tank issues
Posted: Wed Apr 13, 2011 10:46 am
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If the reverb worked fine prior to a tech working on the amp and the reverb is now not performing to spec, then you should return the amp and insist that he make it right.

Arjay

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Post subject: Re: Reverb tank issues
Posted: Wed Apr 13, 2011 11:13 am
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Retroverbial wrote:
If the reverb worked fine prior to a tech working on the amp and the reverb is now not performing to spec, then you should return the amp and insist that he make it right.

Arjay



yes I will be calling him if a cable swap doesn't cure this. But it will be hard to blame him as what he did had nothing really to do with the reverb. He put in power tubes that I had bought and rebiased. All he did where the reverb is concerned is unplug the reverb cables from the amp and then plug them back in.


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Post subject: Re: Reverb tank issues
Posted: Wed Apr 13, 2011 11:20 am
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golfnut wrote:
All he did where the reverb is concerned is unplug the reverb cables from the amp and then plug them back in.


Did he plug them back in correctly?

Arjay

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Post subject: Re: Reverb tank issues
Posted: Wed Apr 13, 2011 1:59 pm
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Retroverbial wrote:
golfnut wrote:
All he did where the reverb is concerned is unplug the reverb cables from the amp and then plug them back in.


Did he plug them back in correctly?

Arjay



Yes I checked that and when I called him yesterday that was the first thing he asked me to check. I reversed the cables and got absolutely no reverb so I know he had it hooked up right. As well someone made a red mark with marker or something beside the input where the red colored one goes.


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Post subject: Re: Reverb tank issues
Posted: Wed Apr 13, 2011 2:07 pm
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Try replacing the reverb driver with a known good 6V6 and see if that doesn't restore the reverb. Aside from opening the amp up to trouble-shoot the chassis, that's really the last thing to do.

HTH

Arjay

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Post subject: Re: Reverb tank issues
Posted: Wed Apr 13, 2011 2:59 pm
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Arjay's correct. The Dual Pro should take a 6V6GTA (even a bit more power than a standard 6V6GT) to drive the reverb tank.

See if that does the trick.


http://www.ampwares.com/schematics/dual ... sional.pdf


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Post subject: Re: Reverb tank issues
Posted: Wed Apr 13, 2011 3:25 pm
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BMW2002Ti wrote:
The Dual Pro should take a 6V6GTA (even a bit more power than a standard 6V6GT) to drive the reverb tank.


I doubt that substituting a 6K6 had anything to do with the reverb failure -- I checked my copy of the RCA tube handbook just to be certain and aside from some nominally-different specs for impedance load and transconductance, its standard operating characteristics are quite similar to the 6V6 series. I was thinking perhaps the tube just up and died. It's been known to happen.

Arjay

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Post subject: Re: Reverb tank issues
Posted: Wed Apr 13, 2011 3:48 pm
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Thanks for the advice guys. Problem solved. It was the cable Replaced the old cables and the reverb is full and lush again.


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Post subject: Re: Reverb tank issues
Posted: Wed Apr 13, 2011 3:53 pm
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Outstanding!

(insert applause emoticon here)

8)

Arjay

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