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Post subject: Microphonic Deluxe Reverb?
Posted: Wed Jun 04, 2008 9:12 pm
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Hi All,

I'm having trouble with my Deluxe Reverb Reissue, looking for some advise.

It was working fine, then I replaced v4 with another 12ax7 and when I would play I would get ringing noise attached to my guitar notes. Tapping the amp cabinet forced this ringing noise through the speaker too. I figured the tube was microphonic so I put the oringinal one back in, but the problem was still there. I replaced all the tubes back with the original ones, but still the same problem. Didn't matter which tube I used, they all sounded microphonic in v4 and were all fine in v1 or v2. Eventually after swapping tubes for a while the problem went away.

Turned it on the next day and I got microphonic feedback from the speaker even with no guitar plugged in. I pulled all the tubes out and put them back in the same sockets, microphonic feedback was gone, but the amp made a lot of noise, hissing, humming, static etc.

I pulled the chassis out and checked for bad connections, couldn't find any, I retensioned the tube sockets, they all look clean, as do the tube pins. Turned it back on and it's still noisy but now my v1 and v2 posistions are acting microphonic, swapped the tubes around a bit more, doesn't help, the microphonics are staying with the sockets, not the tubes. It's still making a lot of idle noise too, much more than normal.

Mainly the problem is my v4 position was microphonic regardless of the tube I had in there. Now my v1 and v2 positions are microphonic regardless of which tubes I have in there. And there's a lot of idle noise coming out of the speaker.

The volume and tone knobs affect the sound, the effect knobs don't.

This is weird and confusing me, any one have any suggestions? They would be much appreciated.

Thanks, John.


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Post subject:
Posted: Thu Jun 05, 2008 3:33 pm
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Ok, now all the microphonics and most of the noise has disapeard, without me doing anything, I guess that rules out the tubes.

Only now the amp sounds badly distorted even at low volume.

Maybe the power filter caps?

The amp's only about 2 years old, maybe 1000hours on it.

I checked all the plate to ground and cathode to ground voltages, they're all normal.

Is there a way to test the power caps?

Thanks, John.


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Post subject:
Posted: Thu Jun 05, 2008 3:37 pm
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I would have it checked out by an amp tech.

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Post subject:
Posted: Thu Jun 05, 2008 4:17 pm
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Joined: Sun Oct 21, 2007 1:44 pm
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Location: Memphis, TN
When I first bought my DRRI, it had a microphonic tube. I replaced V1 and it went away. But, my amp always makes a bunch of wierd noises, no matter what the volume is or whether or not my guitar is plugged in. This is very annoying because one of the main reasons I got this amp was to record with. It never leaves my house and I almost always play it with the volume between 2 and 3. Sometimes it's really bad, sometimes not so bad. Then, just the other day, I had it warming up on standby, just like I always do, and when I turned it on, it made a wierd feedback type sound and then the fuse blew. I went and got more fuses. It blew 2 more as soon as turned it on. So, now it's in the shop. Dude said it'll be about 2 weeks. 2 weeks! What am I gonna do for 2 weeks? I just have a little crappy old Ibanez amp. Anyway, anyone know what's up with my(our) amp(s)?

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DRRI


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Post subject:
Posted: Fri Jun 06, 2008 6:17 am
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Thanks for the replies, I would get it looked at by a tech but I don't have the money now, and I would really like to learn to fix it myself.

Hollis, when you say weird noises, was it like some kind of wind noise, and/or ghost notes, maybe some ringing at certain frequencies? Mine was like that when I got it, it would come and go like you described, turned out to be the power tubes, or one of them at least. Two weeks... I feel for you, hopefully it'll be better than ever when you get it back, let us know what the problem was.

I haven't had any preamp tube problems until now.

I switched the amp on today and it was all good, worked perfectly as normal, I played through it for about an hour, no problem at all, swithced it off, and later back on, still fine, then I put it on standby for a couple of minutes, back on, and the microphonics had returned to v1 as well as a bit of noise, I've been poking around in the chassis with a stick for a while, I can't get anything to make any noise or make the problem worse or better at all.

The problems only seem to come and go and change when I flick it from standby to on, never occurs or changes or anything while it's on, I can't get it to if I try, just randomly happens when going to on from standby, does that help narrow it down at all?


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