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Post subject: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 9:46 am
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Just took delivery of a '65 DRRI yesterday. So far pretty happy. I had tried one of these before and unfortunately suffered from a lot of RFI issues. I live in an area near many broadcasting antennae. Anyway, this new one not only seems relatively RFI free except when the adjustments are in the most extreme of settings, but IMO it actually sounds a lot sweeter as well. Next order of duty is assembling a small pedalboard of mainly analog pedals to go with it.

The one bit of bad, or rather scary, news is when I first unboxed it and started to play with it it sounded good all for about 15-30 seconds as I fiddled with the knobs. All of a sudden there was a horrible humming/buzzing noise, very loud. I tried adjusting the volume, switching the reverb/vibrato nothing helped. I even then plugged it in to a different outlet, same problem. I let it sit for a little bit, fully intent on returning it to the retail but when I came back 20 mins later it was fine and even though I played it about 45 mins last night, the problem has not reappeared. Anyone have thoughts on that? I actually snapped a video of the noise (mind you it was a lot louder in person):

I am not super experienced with tube amps. I didn't pull any tubes but at some point in the evening I gave them all a little jiggle to make sure they were seated. Need I worry more or just assume it was a freak occurence? I really don't want to send this one back and risk getting another RFI prone one.

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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 11:34 am
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To test if a amp make noise ;

1- Don't plug anything in the amp.

Unplug you guitar and the guitar cord, power on the amp and report


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 11:36 am
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The problem hasn't reoccurred but if it happens again, will try that and report back.


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 11:42 am
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From your pic I would say, move it out from the wall another 4". Try it w/o the pre-amp tube covers. If you play both sides of the amp, find better tubes for V1, V2 & V3. If you really only play w/ the reverb side- remove V1.
The reverb should be expected to hum a little, that's its job. Check the bias and adjust to taste if you can.
Enjoy the amp.


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 11:46 am
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Yes tube(s) might noisy intermittent


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 1:23 pm
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dsouza.b.a wrote:
The problem hasn't reoccurred but if it happens again, will try that and report back.
This sounds similar to something I was experiencing with my new TRRI. Rather than re-hash it here, go back to my thread in this forum starting November 8, 2015. I received some great feedback from the members here. Fortunately, the problem resolved itself and has not manifested again except for a brief belch one night (very loud, nothing plugged in). Unfortunately, I still do not know what it was and I doubt it's really resolved. Unlike you, I was past the 45 day return period.


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 1:43 pm
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LawFlow wrote:
dsouza.b.a wrote:
The problem hasn't reoccurred but if it happens again, will try that and report back.
This sounds similar to something I was experiencing with my new TRRI. Rather than re-hash it here, go back to my thread in this forum starting November 8, 2015. I received some great feedback from the members here. Fortunately, the problem resolved itself and has not manifested again except for a brief belch one night (very loud, nothing plugged in). Unfortunately, I still do not know what it was and I doubt it's really resolved. Unlike you, I was past the 45 day return period.


I was able to locate your thread and yes I believe we have experienced the same issue. I did just get a response from the retailer. This is what they said...

Thanks for the email. One of two things may be happening here. It may
be that the one outlet you connected the amp to initially is not
grounded. It is also possible that any surge protector or extension
cord it was plugged into were also not grounded. More likely is that
there was a cold solder joint somewhere in the amplifier, that
completed the ground connection after being "burned in" for a little
while. While uncommon, it does happen from time to time with audio
circuits that are wave soldered. If this was the case, you should not
experience any further issues like this with your amplifier, as long as
it is connected to properly grounded power sources."

Maybe we experienced the cold solder joint issue. It was a bad experience to have that much I will say.


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 2:17 pm
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dsouza.b.a wrote:
LawFlow wrote:
dsouza.b.a wrote:
The problem hasn't reoccurred but if it happens again, will try that and report back.
This sounds similar to something I was experiencing with my new TRRI. Rather than re-hash it here, go back to my thread in this forum starting November 8, 2015. I received some great feedback from the members here. Fortunately, the problem resolved itself and has not manifested again except for a brief belch one night (very loud, nothing plugged in). Unfortunately, I still do not know what it was and I doubt it's really resolved. Unlike you, I was past the 45 day return period.


I was able to locate your thread and yes I believe we have experienced the same issue. I did just get a response from the retailer. This is what they said...

Thanks for the email. One of two things may be happening here. It may
be that the one outlet you connected the amp to initially is not
grounded. It is also possible that any surge protector or extension
cord it was plugged into were also not grounded. More likely is that
there was a cold solder joint somewhere in the amplifier, that
completed the ground connection after being "burned in" for a little
while. While uncommon, it does happen from time to time with audio
circuits that are wave soldered. If this was the case, you should not
experience any further issues like this with your amplifier, as long as
it is connected to properly grounded power sources."

Maybe we experienced the cold solder joint issue. It was a bad experience to have that much I will say.
Nice response from them and seems plausible, but I know nothing and anything would seem plausible. Since you read my thread, there's not much I can add except my problem didn't show up until I had the amp for almost a year. I had a hissing noise first thing out of the box. Turned out to be a bad preamp tube. Your DRRI should be absolutely quiet. Don't settle for less. I cannot even tell if my amp is on until I play something. It's 85 watts of power and it's that quiet. Enjoy your DRRI. It's a great amp.


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 2:21 pm
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Yes after the issue stopped it is pretty much dead silent unless I crank the reverb up all the way I get the slightest bit of RFI but that is likely due to my location. As long as I don't have that happen again I will be very pleased.


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 3:35 pm
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dsouza.b.a wrote:
Yes after the issue stopped it is pretty much dead silent unless I crank the reverb up all the way I get the slightest bit of RFI but that is likely due to my location. As long as I don't have that happen again I will be very pleased.
Yeah, I failed to mention that if I turn the reverb up, I get a low level hum. I never turn the reverb up past 3 or 4, so it's not noticed. I changed tubes and am convinced that's just a normal thing. It's not audible at all when I'm playing, even at low volume.


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 3:47 pm
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Ok, since no one else has asked.

What's the story of that wicked cool looking Axe?

I know its an amp forum :roll:


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 3:56 pm
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It's called a Teuffel Birdfish. it is basically a modular type guitar handmade by a fellow over in Germany named Ulrich Teuffel. A couple of pros use them, Billy Gibbons and Kirk Hammett. Basically it is supposed to be a stripped down version of a strat. The cylinders are tone bars made of wood. It came with 2 sets, alder and maple. I generally have been using the maple (i have only had the guitar a couple of weeks). It also comes with 5 pickups, 2 single coils, a P-90, and 2 humbuckers. You swap them in and out and can move them and rotate them, all sorts of crazy things. But I have to say it sounds awesome. It's like this really wacky looking guitar but it sustains more than a les paul. I have sustained notes for 14 seconds with the lower output humbucker in the neck.

Here are a few more pics...
ImageImage

That being said, all my amp trials yesterday were with a 62 AVRI fitted with EMG SAs.


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Post subject: Re: NAD: All good + a little bad
Posted: Thu Jul 14, 2016 9:04 pm
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Thanks for the info, much wilder than it looks w/ all the options...


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Post subject: Re: NAD: All good + a little bad
Posted: Sun Jul 17, 2016 9:39 pm
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I've experienced a similar problem upon unboxing a tube amplifier after shipping - loud hum/buzz unaffected by volume control - and found it was merely a loose output tube. Cleaning the contacts and reseating the tube fixed it, although I could make it recur by jostling the tube (until eventually I replaced the tube).


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Post subject: Re: NAD: All good + a little bad
Posted: Mon Jul 18, 2016 6:45 am
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You may be right. Since I kinda jiggled and tapped on the tubes, the issue has not repeated itself so feeling a bit relieved at this point.

Got a new toy to plug into it...
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