FDP Forum / Crackling noises from reverb unit/ 6 messages in thread.

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ABN



Spain

Jan 15th, 2017 05:29 AM        

Dear members, have a nice 2017!<br /> <br /> Yesterday, while rehearsing with my band, suddenly, out of the blue, my Twin Amp started making crackling noises. They were loud! I was playing with volume at 2, and the noise were equivalent in decibels to the sound of the guitar played at that time. <br /> <br /> Soon I found out that if I turned reverb off, there were no more noise. The amp was hot, and I was in a hurry, so I couldn't wait until it cool off a bit and swap the reverb tubes. I'm planning to go today to the reharsing room to make some checks on the amp. <br /> <br /> Have you experienced similar situation before?



pdf64



UK

Jan 15th, 2017 07:01 AM        

Oh dear, how unfortunate, you are having no luck with this amp!<br /> Certainly try a known good 12AT7 in V7 and 12AX7 in V5.<br /> Unplug the reverb cables to the tank at either end, perhaps apply a little lubricating contact cleaner to them, and re-fit them. <br /> Check that the outer shield contacts of the RCA plugs haven't become splayed out; they need to squeeze tightly on to the socket contact.<br /> <br /> To stop the crackling did you turn the reverb off at the footswitch, or turn the reverb level control down to minimum?



ABN



Spain

Jan 15th, 2017 08:14 AM        

Hi Pdf64!<br /> <br /> I'm right now at rehearsing room. The amp seems fine, now. <br /> The tubes have couple of months...and the RCA are in good condition. <br /> <br /> Yesterday I turned off reverb at the footswitch. I presume if I turned it off at the knob it would go away the same way. <br /> <br /> From my experience, reverb units have lots of problems. I'm more and more leaning towards the use of reverb pedals. Unfortunately :(<br /> <br /> Can't find out the cause of the problem :( <br /> <br /> Why you asked if I used the footswitch or the knob?



ABN



Spain

Jan 23rd, 2017 03:13 PM        

Hi!<br /> <br /> Check this out: https://youtu.be/uwI5NvADJoQ<br /> In fact, noise occurs even with reverb off. The reverb amplifies it!<br /> <br />



pdf64



UK

Jan 24th, 2017 11:18 AM        

"Why you asked if I used the footswitch or the knob?"<br /> <br /> There's a gain stage V5a between the reverb mute circuit (actuated by the footswitch) and the reverb control.



Coral Head



Sunshine State

Groupies needed
Feb 11th, 2017 04:36 AM        

I have never heard that the Twin Reverb has reverb problems. Mine is from 1969 and the reverb always works perfectly. I think you have a small problem that can be easily fixed.



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