JoshHeartless
Joined: Jun 17, 2006
Posts: 1010
Bay City, Michigan
|
Posted on Mar 16 2007 07:26 PM
i need some friggin' help! my onboard reverb occasionally cuts out, used to be not very often, but now its been more frequent. basicly the reverb just stops, and my guitar sounds nearly completely dry, but in the backround there are little clicky noises, but the reverb it gives it a drip sound, so there are just little poppy drips that happen is short grouped sperts every now and then. it used to be that id just let my amp cool down a bit and itd be fine, but about a week ago it did it and wouldnt return to normal, even after a few days of not using the amp. i tried swapping the R.R. and R.D. preamp tubes with some other tubes in the amp to see if they were the problem and they didnt seem to be. then a few days ago it just randomly started working again, until i practiced with my band today, and once again, its not returning to normal. does anyone have any advice for me?
a while back i swapped out the 12at7 reverb tube(i believe its the reverb driver) with a 12ax7, so there are 12ax7's retrieving an sending the reverb signal, could this have caused any problems?
i need an answer quick! i have a show tomorrow and going with a reverb-less sound is not an option.
thank god this will probably be the last show ill need to worry about an onboard.
— The Tremblors on Facebook!
The Tremblors on MySpace!
|
4AB3C1B
Joined: Feb 09, 2007
Posts: 71
Montreal, Canada
|
Posted on Mar 16 2007 09:02 PM
The tube swap in itself should not cause a problem, as an at7 and ax7 are simply different gain wise. But it is good "cause and effect" that the last thing you did messed things up. What was the reason to swap tubes? Can you verify the integrity of the 12ax7 you added? Stick in a new one or put back the old 12at7. Either way it sounds like you need a quick fix for your upcoming show and you won't be able to get a tech to go over the circuit by tomorrow. So maybe you can borrow a tank, or in a pinch, a pan from another amp (even if it isn't a direct match you can keep the reverb level low to keep too much voltage from going through it . A little reverb is better than none). Also clean/deoxidize the rca cables to rule out the simple stuff.
Good luck and it sounds like life will be good when you get your new tank!
Marc
|
RobbieReverb
Joined: Feb 28, 2006
Posts: 2388
San Jose, Ca.
|
Posted on Mar 17 2007 12:28 AM
By no means am I remotely an expert, but for what it's
worth, (if you followed the good advice offered by 4AB3C1B
with no success) maybe it's dirty contacts in the tube socket?
 
Best of luck!
Bob
— Bob
|
JoshHeartless
Joined: Jun 17, 2006
Posts: 1010
Bay City, Michigan
|
Posted on Mar 17 2007 12:06 PM
by cleaning the contacts do you mean deoxidizingwhere you put the tube in?
— The Tremblors on Facebook!
The Tremblors on MySpace!
|
WR
Joined: Feb 27, 2006
Posts: 3832
netherlands
|
Posted on Mar 17 2007 01:52 PM
I assume you've checked the rca leads?
— Rules to live by #314:
"When in Italy, if the menu says something's grilled, don't assume it is."
https://www.facebook.com/The-Malbehavers-286429584796173/
|
Louie7
Joined: Jan 30, 2007
Posts: 448
50,000 Light-Years Beyond Planet Claire
|
Posted on Mar 17 2007 02:37 PM
yes...by awl meens.... pull the pan.... deOxit the RCA plugs and jacks and tighten the plugs by GENTLY crimping them inward somehow. I have smooth-jawed pliars that have been shaped to fit perfectly around RCA plugs, but you can do it with your fingers if you try.
The basic idea is to establish as firm contact as possible with plugs and jacks that are as free from oxidation, dirt, or other objectionables as possible.
JUST don't tighten the plugs so much that you have to reef to get them on or off.... that's a risk to the connections, which can easily be pulled loose...especially on cables that already have a few years on them.
If the problem persists.... try swapping out the cables for new ones.... hi-fi patch cords will work in a pinch. The idea here is called 'process of ilimination' ...
IF it works, you can call it the process of ILLUMINATION! 
L7
|
RobbieReverb
Joined: Feb 28, 2006
Posts: 2388
San Jose, Ca.
|
Posted on Mar 17 2007 02:51 PM
JoshHeartless
by cleaning the contacts do you mean deoxidizingwhere you put the tube in?
yes
— Bob
|
eddiekatcher
Joined: Mar 14, 2006
Posts: 2778
Atlanta, GA
|
Posted on Mar 17 2007 03:13 PM
I assume that the foot switch has been disconnected. If that's been done. Turn up the reverb knob and shake the amp. Does it splash? If so it's upstram of the pan. Rob the 12ax7 from the normal channel (far right looking at the back of the amp) and try it in the reverb drive and recovery positions. If no change then pull the pan and look inside it for a broken wire feeding the tranducers at either end of the spring. And of course wobble the tubes around in each socket to "clean the contacts". Usually reverb problems are simple and easy to fix......let us know what you find.......ed
— Traditional........speak softly and play through a big blonde amp. Did I mention that I still like big blonde amps?
|
May Birthdays 
