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Post subject: Brand New DRRI problem
Posted: Fri Jun 15, 2012 3:32 pm
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Just plugged in my brand new DRRI and after about 15 minutes of playing I noticed that the amp is a little on the noisy side. I seem to hear quite a bit of white noise. Then unexpectantly I hear a sound that seem like a light thunder through the speaker. When I lean over the amp to see if I can see anything visable I thenstart to hear a whistleing sound.
Does anybody know what this might be. I hate to have to take the amp right back.


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Post subject: Re: Brand New DRRI problem
Posted: Fri Jun 15, 2012 4:47 pm
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Sounds like a faulty tube. Any difference in noise on either channel?

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Post subject: Re: Brand New DRRI problem
Posted: Fri Jun 15, 2012 5:47 pm
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db0967, welcome to the Forum. I think that Shimmy is correct. What you can try is using a wooden chopstick or the eraser end of a pencil and GENTLY tap each tube and see if you can isolate the problem tube.

If one tube seems to make the "noise" more than others... you might want to try contact cleaner on the socket and tube pins (I like Caig De-Oxit GN-5). If this doesn't help, try another tube.

If all this doesn't seem to work... it maybe a poor solder point on the board or a faulty connection (jumper or patch) somewhere in the circuit. This would require removing the amp from the cabinet and testing it on a bench (read: may need a tech).


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Post subject: Re: Brand New DRRI problem
Posted: Fri Jun 15, 2012 10:05 pm
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If the amp is under guaranty, bring it back the your 7ender dealer for repairing or exchange. Even the valves are under guaranty for 3 months.
:wink:
8)

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Post subject: Re: Brand New DRRI problem
Posted: Sat Jun 16, 2012 12:44 am
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Tis-san wrote:
If the amp is under guaranty, bring it back the your 7ender dealer for repairing or exchange. Even the valves are under guaranty for 3 months.
:wink:
8)


+1

Sounds like a fawlty bottle or two.

Arjay

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Post subject: Re: Brand New DRRI problem
Posted: Sat Jun 16, 2012 5:32 am
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Are they still using those Ruby 5AR4 / GZ34 Rectifier tubes ???

At least three of us had noise issues with those tubes here on this forum.

I had two different DRRI's with faulty ruby Rectifier tubes.

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Post subject: Re: Brand New DRRI problem
Posted: Sat Jun 16, 2012 11:50 am
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My DRRI showed exactly the same symptoms so I took it straight back to the shop. They swapped it, no quibbles.

The replacement was much better though experimenting with the preamp valves has improved it further both in terms of tone and the background noise. Here is an excellent source of ideas if you're not that familiar with the configuration:

https://www.kcanostubes.com/content/fen ... mendations

Also: turn all the dials on the channel you're not using to zero. That will help keep down the background noise.

Good luck, be patient: it's a lovely amp!


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Post subject: Re: Brand New DRRI problem
Posted: Mon Jun 18, 2012 3:35 am
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That definitely sounds like a microphonic tube. Do the recommended test (tapping each tube) find the bad one and take it back to the store, if its new all parts are still under warranty.... :wink:

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Post subject: Re: Brand New DRRI problem
Posted: Mon Jun 18, 2012 8:21 am
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I am going to take it back today. I'm not as happy as I thought I would be with this amp. First it seems like these amps have a few problems that need to be worked out. Second this amp doesn't seem to sound as good as I thought it would. Perhaps when I played it at the store I had the volume cranked a bit. Third my strat plus sounds very harsh in the neck position and a little muddy in the neck / middle position. However it does sound good when I turn the amp volume up to at least 3 and the guitar volume to 10 and select the neck / middle pickups. I still have a few more days to decide if I want to keep it.


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Post subject: Re: Brand New DRRI problem
Posted: Thu Jun 21, 2012 4:27 am
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Sad really !
They are or were about the best sounding current production fenders out there with very few exceptions !

My guess is you just got a bad one or at least bad tubes.

Its must be a real pain for Fender to fill its amps with todays tube makers stuff and not expect a bunch of returns, imagine an American car company having to buy all of its spark plugs from russia or china and getting them all returned due to poor performance.

If I was Fender and serious about selling good tube amps, I think I would invest in a tube maker and not another company that re lables russian and chinese junk.

Yes I know they sell thousands of these and we are only seeing a very small % here, however it is not helping the cause of keeping them from being 100% import made junk !

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Post subject: Re: Brand New DRRI problem
Posted: Thu Jun 21, 2012 4:31 am
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blues bondsman wrote:
company that re lables russian and chinese junk.


The emphasis has to be on "junk" because you can get very decent russian and chinese tubes if you pay for it.

Cheers

David

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Post subject: Re: Brand New DRRI problem
Posted: Thu Jun 21, 2012 4:58 am
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I would have to ask what "decent" is

Nothing sounds like NOS RCA or Mullard or Sylvania or GE or...........

The tung-sol reissues had promiss then they were found wanting in durability.
The TAD stuff has held up well for me in stuff I'm selling off
But if its in my studio it has to be British or USA made NOS and yep I'll admit I'm a cork sniffer when it comes to tubes (thanks to some of the guys here).

Were getting off point here, Fender needs a reliable tube maker and to invest in getting tubes made that sound as good as the old stuff, it would seem like a worth while investment.

SS isnt going to take over the music world tomorrow (God forbid) !!!
Even some of the next generation will have ears and want good tone !

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Post subject: Re: Brand New DRRI problem
Posted: Thu Jun 21, 2012 6:48 am
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blues bondsman wrote:
Were getting off point here, Fender needs a reliable tube maker and to invest in getting tubes made that sound as good as the old stuff, it would seem like a worth while investment.


+1

I'd say it's imperative if FMIC wishes to maintain its reputation.

Arjay

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Post subject: Re: Brand New DRRI problem
Posted: Thu Jun 21, 2012 7:21 am
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It is sad to see fender selling so many unreliable amps. I took my amp back to Guitar Center and the only replacement they could give me was one of the two that was on the floor and one of those didn't even work. I wound up asking for a refund and put the money back in my pocket. I was dissappointed that all I seem to hear is that the tubes are microphonic or something else is wrong with the tubes and then I wind up with an amp that has problems. I really wanted this amp but now I think I might have to look elsewhere maybe Allen or Headstrong.


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Post subject: Re: Brand New DRRI problem
Posted: Thu Jun 21, 2012 7:24 am
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I remember seeing this on Arjays replys

"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

How true it is


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