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FDP Forum / Fender Amps: Vintage (before 1985) / My Deluxe Reverb cratered just before a gig

BbendFender
Contributing Member
*********

American Patriot

I'm on guard these days.
Apr 3rd, 2016 07:50 PM   Edit   Profile   Print Topic   Search Topic

Set up and was practicing and all of a sudden my Deluxe Reverb made a funny noise and sputtered a few times. One 6V6 was red hot so I shut it down. I was 400 miles from home and moved my backup '75 Peavey Pacer 100 into place.
Not sure what is wrong but I suspect a bias problem. The Pacer worked without a flaw. I hate equipment problems but they happen when you use older equipment.

damuniz
Contributing Member
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South Jersey/USA

She turned me into a newt!....
Apr 4th, 2016 07:42 AM   Edit   Profile   Print Topic   Search Topic

It may be as simple as a tube failure.

Try a new 6V6 first.

Hammond101
Contributing Member
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So. Cal. USA

Apr 4th, 2016 09:52 AM   Edit   Profile   Print Topic   Search Topic

Shucks, I hate it when that happens. I know that you know Bbend but pull tubes and measure voltages first.

Back in the day I always had a backup with me even if it was just a Crate Power Block, not so much anymore.

LHW

Southwest Florida

Alone in my principles
Apr 4th, 2016 10:04 AM   Edit   Profile   Print Topic   Search Topic

I agree with damuniz. I had a 1972 Deluxe Reverb, and it blew a power tube during a gig. I plugged directly into the PA to finish. I replaced both 6V6s, and was good to go again.

guitarcapo

U.S.A.

Apr 4th, 2016 12:14 PM   Edit   Profile   Print Topic   Search Topic

Deluxe Reverbs use high plate voltages that are out of spec with what 6V6 power tubes were originally designed for. It's amazing that power tubes last as long as they do in that kind of environment.

BbendFender
Contributing Member
*********

American Patriot

I'm on guard these days.
Apr 4th, 2016 02:50 PM   Edit   Profile   Print Topic   Search Topic

A week before the gig I set up everything and tried it. After about an hour, one 6V6 plate was just a tad red so I changed to a new set of 6V6's and all seemed ok. Went to the gig and set up and checked everything and seemed ok (2 hrs) until about 20 min. before the gig started. I always carry extra tubes and a backup amp. I just got home from my trip and I will check it out.

BbendFender
Contributing Member
*********

American Patriot

I'm on guard these days.
Apr 4th, 2016 08:28 PM   Edit   Profile   Print Topic   Search Topic

So far I have a dead rectifier tube and the 470 ohm grid resistor is discolored but still measures 475 ohms on one of the 6V6's. Also that 6V6 was bad. Don't know if it went bad due to something else or was just a bad tube. I had tested all of my backup tubes and they were good.
Question, do the rectifier tubes get really hot when functioning normally?
I'll have to take this to a tech because I want it working correctly and not just patched back together.

slider313

NC

Apr 5th, 2016 06:50 AM   Edit   Profile   Print Topic   Search Topic

Is your amp an original or reissue? One thing that will kill a rectifier is too much filtering. Have you upped the value of the first node power supply cap? I would change both grid resistors and use metal film. It could be just a runaway tube. It wasn't a TAD, was it?

(This message was last edited by slider313 at 08:51 AM, Apr 5th, 2016)

MLC
Contributing Member
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It's not just good..

...it's good enough.
Apr 5th, 2016 07:08 AM   Edit   Profile   Print Topic   Search Topic

"Question, do the rectifier tubes get really hot when functioning normally?"

Yes.

From the sounds of things, a trip to the tech is a good plan. With all the swapping of power tubes and rectifiers, at the very least, you need to have the bias tested and set correctly.
And since tubes have crapped out and components are discolored, there may be other issues going on.
Good luck!

BbendFender
Contributing Member
*********

American Patriot

I'm on guard these days.
May 8th, 2016 06:25 AM   Edit   Profile   Print Topic   Search Topic

The problem was with the 6V6's. Took it to a tech and I thought he would have to do a bunch of work but he said the tubes were at fault. He recommended JJ's. He biased the new tubes and said everything else looked ok. The amp sounds great now.

Peegoo
Contributing Member
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Eat. Sleep. Guitar.

Repeat
May 8th, 2016 07:38 AM   Edit   Profile   Print Topic   Search Topic

I always love a happy (and inexpensive!) ending.

FDP Forum / Fender Amps: Vintage (before 1985) / My Deluxe Reverb cratered just before a gig




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