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Post subject: Deluxe Reverb RI generates a weird noise. Please help.
Posted: Fri Jul 03, 2009 5:28 am
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Hi!

I am new in this forum and in tube amps also. Did a search but couldn't find a problem quite like that.

I try to describe:
It happens when playing the note Es on 2nd string and let it ring. After couple of seconds a strange bassy hum developes and when the original tone starts to fade, the hum goes down to lower frequency. It is quite strong too, so it is very annoying. The original tone is completely unaltered, there is just that extra "bass line". it doesn't matter if the volume is turned up or is very quiet. All channels and inputs do that. Treble or bass knobs dont affect it. It is like some weird resonance happens but it comes definitely through the amp is not just something in the construction of the box.

Thanks,
e-man


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Post subject:
Posted: Mon Jul 06, 2009 4:08 am
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DRRI's tube sockets are bad quality - so they need to be replaced with good ones to avoid spending money to replace the tubes too often. That is what i found out from a fellow drri owner - he had the same issue, changed the sockets and now his amp is fine.


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Posted: Mon Jul 06, 2009 5:49 am
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That's pretty much nonsense. It's more than likely a tube or speaker problem. It's not poor quality sockets, could be dirty sockets, especially if the tubes are tight in their sockets. If they're not, they can be re-tensioned.

It's more poor quality stock tubes. GT's are pretty awful. One could be microphonic. The DRRI is one of the only amps in the Fender tube lineup that has the tube sockets mounted directly to the chassis and hard wired to the PCB instead of to a PC board.

The DRRI is also one of the most reliable amps in the Fender lineup.

It could also be a speaker issue too. Could be ghost notes and cone cry. I would just take it to a tech.


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Posted: Mon Jul 06, 2009 6:16 am
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63supro wrote:
That's pretty much nonsense. It's more than likely a tube or speaker problem. It's not poor quality sockets, could be dirty sockets, especially if the tubes are tight in their sockets. If they're not, they can be re-tensioned.

It could also be a speaker issue too. Could be ghost notes and cone cry. I would just take it to a tech.


It doesnt appear before 5 minutes at any volume. So it couldn't be cone cry. Should be power tubes because after switching on from standby it takes a minute to appear again. I try just to put in some nice new tubes then.

Thanks.


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Posted: Mon Jul 06, 2009 7:48 am
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Try Tung-Sol or JJ's.


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Posted: Fri Jul 10, 2009 4:49 pm
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I bought my DRRI brand new. I had to replace 1 preamp tube within 2 weeks, it was very bad micrphonic. It started blowing fuses, I replaced the rectifier tube. A couple months later it started blowing fuses again. I took to the shop, they replaced the power tubes and rebiased. Within 6 months I had replaced all the tubes except the reverb tube due to failure. I've had it about two years now and it works beautifully. No more issues at all. Very quiet amp. I love this thing. This is the tone that all these boutique companys
are trying to emulate.<--Opinion :D

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Posted: Sat Jul 11, 2009 8:44 pm
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Hi Eman, So the hum is heat(after 5min.) and frequency(mids) related. Also, the pre amp controls have no effect on changing the hum following the note that is played, and the note is true. If I have this straight, which hardly ever happens, we're looking to the power supply or the power amp sections for the noise source. For the power supply,I would be concerned about the age and quality of the filter caps(and amps warranty staus). As for the power amp, two 6V6's and a 12AT7, again it's about age and quality. If the 6V6's are reasonably fresh, I'd try R&R of the phase inverter(12AT7) with a tested and matched one. I don't know about recent GT stuff, but I've used their MPI tubes from their SAG dept. with good results in the past. It's worth the test, and if that clears up the problem, then you can save up for NOS matched PI and 6V6's. Good Luck Art


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Posted: Mon Jul 13, 2009 3:29 pm
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I had a similar undertone that only developed when playing a high A note, on the B (10th fret) or E (17th fret). It annoyed me alot, as the amp was new. A princeton reverb reissue. I remembered the last tube amp I bought and how it showed up with a bad tube. I love UPS. I think they punt those things off the truck! Any way, It was a power amp tube. I replace the pair and it sounds sweet. I hope this helps. Good luck! 8)


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Posted: Sat Aug 29, 2009 5:55 am
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Thanks!

I replaced the original tubes with Tung-Sol. The weird tone is gone and the amp sounds much much better.

But... there is at least some truth about bad sockets though. One of the power tube sockets makes the tube resonate. Also after playing some time the tube just slips out of the socket a bit and the resonation goes louder. If i push the tube back, the resonation stops... for a while.

The tech-guy said that they used to make the sockets from graphite or some carbon thing (i dont remember) but nowadays they just order some plastic sockets from china. They shrink and expand when the temperature changes and in time these sockets tend to be the reason for burning out the tubes. Since my teachers DRRI had the excact same issue, i'll have the sockets replaced. Will void the warranty but Fender amps are reliable enough heh:)


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Posted: Sat Oct 17, 2009 5:35 am
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I ordered new sockets and couple of preamp tubes. I was about to send the amp to the tech-guy but before I opened the amp and tried to find the culprit of the resonance. It turned out to be one of the tubes itself. Sockets are nice and tight, ceramic. Nothing wrong with them.
So my talk here was a bit stupid:)....


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Posted: Sat Oct 17, 2009 9:31 am
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Hey Eman, your questions are valid. Our opinions are just that, opinions. What was stupid, was my over analyzed answer. Supro had the answer back in June, tubes. Yep, 90% of the time, it's tubes that are the culprits in these amps. ART

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Posted: Sat Oct 17, 2009 10:56 am
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Still nothing wrong with covering all the bases. :D


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Posted: Thu Dec 10, 2009 5:56 am
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Hi again.

I am not bitching or anything:).. just saying that my old-timer guitar teacher and his "personal" amp-technician was right this time.

The sockets ARE bad. rectifier's socket screams now like pig in a slaughter-house and one of the power tube sockets gives a bad connection - when slightly moving the tube when the amp is working then a loud "bang" happens. The other one seems to be working fine... so far. The result was 1 dead rectifier and 2 almost dead power tubes. 1 of them was brand new. The second one developed similar fault as the first one. It took only a couple of days.

e.


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Posted: Thu Dec 10, 2009 12:01 pm
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I'm just saying that because you had a bad tube socket, it doesn't mean it's a common problem. I play with many musicians who have had the DRRI for years and never had a socket problem.. We had our amps serviced when needed and it always included re-tensioning the tube sockets. We made our livings with our amps including DRRI. I've rented some over the years for out of town gigs and never had a problem.

Welcome to tube land. :D It happens.


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Post subject:
Posted: Thu Dec 10, 2009 5:11 pm
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Yeah tube sockets can be a problem if they aren't kept clean and tight. If they can no longer be retensioned or are deteriorated beyond the point of deoxidation, they must be replaced. Belton would be my choice. Art

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