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Post subject: ? for arjay or other amp gurus
Posted: Sat Nov 20, 2010 1:19 pm
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I have a deluxe reverb ll I've been using a lot lately. The last 2 days when I turn it off there is a crakling noise ( like if you had a bad cable plugged in and when you move your guitar it crackles). No noise when you turn it on, no noise while playing, only when you turn it off. It does it whether and instruments plugged in or not. The tubes have been in a while but they still sound great. Any ideas guys or should I just take to a tech. Have a jam coming up over Thanksgiving and really don't want to drag the twin out, but don't want to be left high and dry either, plus don't want to do major damage to the deluxe.
Thanks ahead of time,
filerj


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Posted: Sat Nov 20, 2010 3:06 pm
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Are you using your standby switch to "warm up" the tubes before playing and "cool them down" prior to shut-down?

Arjay

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Posted: Sat Nov 20, 2010 4:14 pm
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Arjay, thanks for the quick response. These models had no standby switch on them. So it just gets turned off when I'm done.
Thanks again,
filerj


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Posted: Sat Nov 20, 2010 4:21 pm
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Oops, I missed the "II" in the question.

I'm not familiar at all with that platform.

Wait until tissan checks in -- I'm betting that he's seen these come across his bench before. Him, or stratele.

Arjay

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Posted: Sat Nov 20, 2010 11:18 pm
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I haven't dealt with this issue with any Deluxe Reverb II, per se, but tube amps that have had this problem usually contact cleaner on switch or new power switch works. I like CAIG De-oxit D5 contact cleaner.

If not that, then it could be the electrolytic caps of the power supply getting a bit dry. Specifically, the first stage (see the 40mfd/450 VDC and 80 mfd/450 VDC of the cap can, on the schematic).

Anyhow, good luck with your amp.


http://www.ampwares.com/schematics/deluxereverb_ii.pdf


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Posted: Sat Nov 20, 2010 11:26 pm
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Could be a combination of both those issues, BMW.

IIRC the "II" series amps were made back during the Rivera era (close to thirty years ago now).

Arjay

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Posted: Sun Nov 21, 2010 4:59 am
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I realy don't know for sure what cause the crakling noise when you power OFF.

Are that have the power tubes, which emit a cooling crunch because they are older and way too hot ( bias) and the amplifier does not have switch to STANDBY, which is a shame for 6L6 tubes ?
( google translation)


You said tubes have good sound : they often have a good sound before dead or if running too hot


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Posted: Sun Nov 21, 2010 6:22 am
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Thanks for the responses everyone. I'll give the contact cleaner a try and let you know. As far as the bias it wasn't biased hot when the tubes where put in, but I know that can sometimes drift. By the way Stratele the DRII uses 6V6's not 6L6's, although I have read where some people have moded them to use the 6L6's. Why, I'm not sure?
Thanks again everyone, the people here are the best at sharing knowledge of guitars and amps.
filerj


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Posted: Sun Nov 21, 2010 6:40 am
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You are right , I should write 6V6, yes you can use 6L6 for more clean tone if your power transformer can give more heater current for 6L6


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Posted: Sun Nov 21, 2010 8:49 am
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Hi filerj,

Lot of great suggestions and info here, these guys are great. I have a question. Does your DRRI have a tube rectifier or solid state rectifier? If a tube rectifier, you might want to try a new one, it could be crackling. If a solid state rectifier, you really need a standby switch as Retroverbial pointed out. I would want one anyway, just seems right. I wonder if a standby can be fitted on your amp. :idea:

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Posted: Sun Nov 21, 2010 10:13 am
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If your amp have a 5AR4/ GZ34 rectifier, this tube have "slowly" voltage builtup ( is the right word ?) and I read from some good tech books you don't need strandby switch.

It's ggod to have stanby switch but not too bad in this case.


Somebody heard about that ?


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Posted: Sun Nov 21, 2010 10:25 am
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That's my understanding also stratele52. The voltage from the tube rec "ramps up" slower than a solid state rec. The tube rec is easier on the tubes than getting the instant voltage slam of the solid state rec. That's what I was saying above, if tube rec, standby switch isn't needed as much. :)

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Posted: Sun Nov 21, 2010 10:33 am
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Attention Shimmilou, the only popular tube rectifier working like that is the 5AR4\GZ34. This tube have a cathode.
Others like 5Y3 and 5U4 are faster warmup. Their construction is not the same.They don't have cathode. Look in the RCA tubes Manual. With those tubes you need a stanby switch


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Posted: Sun Nov 21, 2010 10:39 am
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stratele52 wrote:
Others like 5Y3 and 5U4 are faster warmup. Their construction is not the same.They don't have cathode. Look in the RCA tubes Manual. With those tubes you need a stanby switch


Which I find ironic since the only Fender amps of the "modern" era to use a 5Y3 rectifier tube are the student model Champs, Vibro Champs, and Broncos.

And neither of them are equipped with a standby switch. Weird.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Posted: Sun Nov 21, 2010 1:31 pm
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They were low budget amps when desing by Leo 7ender


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