It is currently Mon Mar 16, 2020 6:46 pm

All times are UTC - 7 hours



Post new topic Reply to topic  [ 16 posts ]  Go to page 1, 2  Next
Go to page 1, 2  Next
Author Message
Post subject: reverb "ringing sound" on new DRRI
Posted: Mon Jul 29, 2013 7:27 am
Offline
Hobbyist
Hobbyist

Joined: Mon Jul 29, 2013 7:13 am
Posts: 20
I've a BRAND NEW 65 Deluxe Reverb Reissue (from Musician's Friend)-the reverb, when cranked, immediately produces an ascending ringing sound, much like a ringing in the ears or a microphone beginning to feedback/this doesn't seem to occur @ moderate, usable settings (3-4)-this MUST be a bad preamp tube, right? 'any troubleshooting advice regarding this highly regarded amp?....thx


Top
Profile
Fender Play Winter Sale 2020
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Mon Jul 29, 2013 11:22 am
Offline
Aspiring Musician
Aspiring Musician

Joined: Wed Nov 14, 2007 1:29 pm
Posts: 614
Location: SW Ohio
Your question is more suited for the Modern Amp forum as this forum focuses on vintage amps. The DRRI is a modern amp. You still might get a few responses here.

That said - if the amp is new, this is a warranty item. You need to check with Musician's Friend to verify if you should return the amp to them or to Fender.

Hope that helps.


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Mon Jul 29, 2013 3:27 pm
Offline
Hobbyist
Hobbyist

Joined: Mon Jul 29, 2013 7:13 am
Posts: 20
'yeah, I clicked on the wrong subcategory, or whatever-'knew it as soon as I did it-if anyone wishes to chime in, is the preamp tube driving the reverb one of the 12AT7s?-I thought about "tube rolling" or reversing the two 12AT7s, hoping to troubleshoot what must be any easy fix-I'd almost rather BUY a new tube rather than deal w/the hassle of WHERE to return the amp for repair


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Mon Jul 29, 2013 3:36 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
The V3 12AT7 tube (third from the right when looking at the chassis from the rear) is the reverb driver. V4 (a 12AX7) performs the recovery function. If the V3 bottle has become microphonic the last place you want it is in the V6 phase-inverter position. If V4 is the culprit you could temporarily swap it with the 12AX7 in V1 (1st and 2nd gain stages for the "NORMAL" channel).

Arjay

_________________
"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


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Mon Jul 29, 2013 5:58 pm
Offline
Hobbyist
Hobbyist

Joined: Mon Jul 29, 2013 7:13 am
Posts: 20
thx Arjay....is the 2nd 12AT7 a vibrato driver?


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Mon Jul 29, 2013 6:03 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
No, it's the phase inverter.

Arjay

_________________
"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


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Mon Jul 29, 2013 8:49 pm
Offline
Professional Musician
Professional Musician
User avatar

Joined: Sat May 22, 2010 10:53 pm
Posts: 1467
Location: deep down in Florida...
If you don't want to deal with returning the amp, probably run into the same issue with the replacement... just pick up one of these for your V3 tube

https://www.kcanostubes.com/content/nos-mullard-cv4024-12at7

Probably the best tube for V3 that's easily available today.

While you're at it pick up a balanced one for V6 as well. You'll thank me later :wink:


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Mon Jul 29, 2013 11:00 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
cedarblues wrote:
While you're at it pick up a balanced one for V6 as well. You'll thank me later :wink:


+1

Then fine-tune the idle bias for optimal blackface tone.

Arjay

_________________
"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


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Mon Jul 29, 2013 11:33 pm
Offline
Aspiring Musician
Aspiring Musician
User avatar

Joined: Tue May 15, 2012 2:49 am
Posts: 560
Location: Perth, Australia
My SuperSonic Reverb had the exact same issue, and the problem is with the Accutronics tank assembly.

Posted from another post I responded to:

I have found the cure to my reverb feedback issue i.e. when the reverb knob was turned passed 5 it would slowly build up with a high pitch feedback even when all other knobs were right down. I have been paying close attention to everyone elses issues and attempts at fixing it, and after doing some comparisons with tubes/cables and various unplugged reverb combinations, adding foam padding, someone suggested in a forum that their reverb might be microphonic. Whether a reverb tank can be microphonic in itself I cannot tell you, but it made me want to take a closer look at the physical reverb circuit to rule out any possible cause.

Looking on Accutronics website they suggest that the orientation that Fender has chosen for the SS and other combo Amp reverb tanks is the least desirable, as this causes gravity to act on the reverb spring and push the ferite beads (there are 4 in mine - one on each end of each spring) in the transformer to sit real close to one side and not dead centre as intended. Now does this make it more sensitive, possibly as smaller movements will be detected easier but bigger ones will be constrained physicaly. Accutronics also state that they custom set the position of these beads based on the customers mounting requirements.

So I took a close look at mine and after a long hard check and fiddle I found that one bead was sitting way too close to the reverb transformer plate, and with gravity added it was REALLY close. So I decided to adjust it and found that you can't bend or solder it into its correct position as that would be too risky. I eventualy found that with some small pliers I could rotate the copper stud that holds this bead and spring until it was orientated such that gravity pulls this bead more central. I then put a dab of superglue on the copper stud to hold it from rotating back.

I am pleased to say that I tested it last night at full reverb volume and while before it would feedback instantly and consistantly at even a 5 setting, I could not get it to feedback at all even at 10.

Other improvements I made while I was trying to fix my reverb was:
- added good foam padding under reverb unit to dampen any vibrational shock in the CAB (this did not cure my feedback, but will help dampen unwanted CAB vibrations).
- the 4 floating springs that stabilize the reverb carridge in it's housing would creek and snap at their fastening rings when moved, giving the reverb a sharp unpleasant jolt of sound, so I put a dab of superglue on each of the fastening rings either side of each spring to ensure only the springs move between their fastenings, making the dampening much smoother.

_________________
GUITAR: Fender USA JazzMaster.
BASS: Fender USA 58'AVRI
AMP: Fender USA SuperSonicTwin - Blonde.
Image


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Tue Jul 30, 2013 5:35 pm
Offline
Hobbyist
Hobbyist

Joined: Mon Jul 29, 2013 7:13 am
Posts: 20
WOW!....thx, all.....maybe I need a GOOD "Fender authorized" amp tech here in Houston, TX (it IS BRAND NEW!)......or, just live with it if it doesn't squeal @ normal settings......'bummer, 'cool amp, otherwise


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Tue Jul 30, 2013 6:49 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
Amp techs are like prostitutes or dentists......you find a good one, hang onto 'em!

:lol:

Arjay

_________________
"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


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Wed Jul 31, 2013 12:10 am
Offline
Professional Musician
Professional Musician

Joined: Fri Jun 26, 2009 6:53 pm
Posts: 2252
Location: Harvard IL
Aaron, that's a really cool bunch of advise!!! Just a question: how is the reverb tank oriented in the Supersonic? I'm an old amp guy, used to the bottom cab mount scenario in most old Fender amps.....Don't mean to hi-jack your thread, Kimac!!! Art

_________________
None of Us are free, if One of Us is chained !


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Wed Jul 31, 2013 12:41 am
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
The CV4024 is a good tube. I like the triple mica, mil-spec Sylvania 12AT7WA (or WC)/6201. A very good tube for combo amps.


http://d2heru13qkbk4q.cloudfront.net/me ... 01_001.JPG


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Wed Jul 31, 2013 1:18 am
Offline
Aspiring Musician
Aspiring Musician
User avatar

Joined: Tue May 15, 2012 2:49 am
Posts: 560
Location: Perth, Australia
aclempoppi wrote:
Aaron, that's a really cool bunch of advise!!! Just a question: how is the reverb tank oriented in the Supersonic? I'm an old amp guy, used to the bottom cab mount scenario in most old Fender amps.....Don't mean to hi-jack your thread, Kimac!!! Art


Hi, aclempoppi.

The SuperSonic TWIN's reverb tank is also mounted on the bottom of the CAB with the spring opening facing down. This is how Fender have been doing it since the beginning and that is how I left mine. Even though Accutronics state this as the worst orientation, Fender/Leo never had a problem with it so niether should we.

Accutronics recomendations are purely because of the spacing between the ferite beads and the mini transformer inner walls, and certain orientations allow gravity to push the bead off-center closer to the inner wall, making it more sensitive to feedback as in my case.

_________________
GUITAR: Fender USA JazzMaster.
BASS: Fender USA 58'AVRI
AMP: Fender USA SuperSonicTwin - Blonde.
Image


Top
Profile
Post subject: Re: reverb "ringing sound" on new DRRI
Posted: Fri Aug 02, 2013 5:39 pm
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
kimac,

Did you resolve the "ringing" issue?

Thanks! :D


Top
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 16 posts ]  Go to page 1, 2  Next
Go to page 1, 2  Next

All times are UTC - 7 hours

Fender Play Winter Sale 2020

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to: