FDP Forum / Reverb issues on a new amp....a tube or something else?/ 22 messages in thread.

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back breaker



eureka, usa

Kid! STOP! you're rockin' the forest!
Dec 28th, 2017 10:43 PM        

Hello- New Custom 64 Deluxe Reverb here. The reverb is giving me issues in the following way: when playing the amp and reverb is engaged the amp starts to hum quietly and then develop a low frequency feedback. It goes away when the reverb is switched off but returns with turned back on. How do I trouble shoot the issue and where to start... could return it but it would take a lot of hassle and time and if it could be remedied, by myself, I'd like to fix it if it's just a bad tube or something else as easy? any suggestions? Thanks



willie

Contributing Member
********

Too Near Atlanta GA

Amp Tech Emeritus
Dec 29th, 2017 09:46 AM        

Sounds like sympathetic vibration of the reverb tank. This is usually caused by the tank not being insulated from the cabinet properly, or not being positioned properly in the cabinet. It can also be caused by having a broken spring in the reverb tank. The latter is a bit more likely in a new amp as this can occur from rough handling during shipping. There are other causes but this should give you a start. <br /> <br /> willie



Peegoo

Contributing Member
**********
**********
******

Curled up

in the fecal position
Dec 29th, 2017 09:51 AM        

If you go poking around in the reverb tank, be extremely gentle. The reverb springs are connected to transducers at each end with a very very fine wire. <br /> <br /> This wire is carbon steel, but is not much larger than a human hair. It can break if you look at it crooked.



Pinetree

Moderator Emeritus
(with many stars)

NW Pennsylvania

Dec 29th, 2017 09:54 AM        

Brand new?<br /> <br /> <br /> I'd use the warranty.<br /> <br /> <br />



back breaker



eureka, usa

Kid! STOP! you're rockin' the forest!
Dec 29th, 2017 11:17 AM        

Thanks for all the suggestions. I have a couple days to check it out prior to shipping it back so I will do some minor tinkering.



willie

Contributing Member
********

Too Near Atlanta GA

Amp Tech Emeritus
Dec 29th, 2017 11:52 AM        

Yeah, use the warranty by all means if you can't identify a cause right off and without doing any real "digging". <br /> <br /> willie



back breaker



eureka, usa

Kid! STOP! you're rockin' the forest!
Dec 29th, 2017 12:34 PM        

I will do some spring inspection prior to shipping back.... a little bit of a bummer. I want to love this amp on first plug in. Thanks again for the info.



back breaker



eureka, usa

Kid! STOP! you're rockin' the forest!
Dec 29th, 2017 04:08 PM        

Hey there - for anyone that will respond to this. I have done an inspection of the amp and it seems as though the feedback (low frequency slowly climbs in volume) especially when the reverb is cranked and upon closer inspection this is happening as a result of the actual tank vibrating the spring and in turn feeding back. is this just a result of the tank's intensity and can be contained. i.e. a normal situation with fender black face type amps that have this reverb circuit? When I put my hand on it and play it is contained and stops... I guess that i am asking if this is a result of the circuit and can be more apt to happen after it is shipped verses an actual defect in my particular amp? thanks for any suggestions in advance and thanks for all the attention to this.... contrary to belief, the vibro king does not have this intense of a reverb so i am not sure what to think upon inspection. <br />



willie

Contributing Member
********

Too Near Atlanta GA

Amp Tech Emeritus
Dec 29th, 2017 04:58 PM        

It is not "normal" but is also not uncommon. The tank should have some damping so as to discourage self oscillation. <br /> <br /> <br /> w



back breaker



eureka, usa

Kid! STOP! you're rockin' the forest!
Dec 29th, 2017 05:30 PM        

Thanks willie- When I put the cover in the back of the amp- there is not an issue with this thing cranked and the reverb on 10.



back breaker



eureka, usa

Kid! STOP! you're rockin' the forest!
Dec 29th, 2017 05:41 PM        

It's like the metal casing is vibrating (once again) and the spring is rattling as a result. Isn't that what the cardboard that it sits on supposed to discourage? I have only opened up my VK to inspect it and there is no issue like this just a curiosity. Like mentioned, this reverb is much more roomy sounding than a vibro-king but that seems like it was always the case when comparing the v-k to black faces that i have tried.



willie

Contributing Member
********

Too Near Atlanta GA

Amp Tech Emeritus
Dec 29th, 2017 08:40 PM        

The VK having a larger cabinet is not as prone to this issue. Yes, the cardboard is likely there to damp the vibration...obviously not doing the job as it should. <br /> <br /> Sounds like you can either live with it, try to add something to help dampen the sympathetic vibration or send it back and get another one. <br /> <br /> w



back breaker



eureka, usa

Kid! STOP! you're rockin' the forest!
Dec 29th, 2017 08:59 PM        

I would also throw in that the deluxe reverb is a pine cabinet meant to resinate more than the plywood cabinet that houses the vk. I have heard of some one else having the same issues with their 64 so maybe it's just an issue with the design and all the things that Fender is trying to do and that in theory it all sounds good but in reality there are some conflicts going on. I am just trying to make sure the best that I can that it's not a circuitry issue specific to my amp. <br /> <br /> Thanks again for the input. Sometimes just bouncing around Ideas gives some comfort.



tepperson



Look at my hair ...

... LIKE THE DESIGN?!
Dec 29th, 2017 09:30 PM        

"If you go poking around ..., be extremely gentle. It can break if you look at it crooked."<br /> <br /> ++ PG ...



Mick Reid

Contributing Member
*****

Australia

American-made in Oz!!
Dec 29th, 2017 09:47 PM        

Honestly if I couldn't fix it myself with a minimal amount of effort, and it was still under warranty, I'd take it to an Authorised Fender repairer.<br /> <br /> There's just too much guess work without being able to see & hear what's going IMO.<br />



back breaker



eureka, usa

Kid! STOP! you're rockin' the forest!
Dec 30th, 2017 12:13 AM        

We are hundreds of miles from an authorized repair person. I played it at loud volumes tonight, drum set and other guitarist and it didn't have an issue at all. I think it's fine. Everything is stock so when I change out the tubes, I will see if that solves the issue.... Fender only offers 2 year warranties on their amps now vs. the 5 year one that used to exist... lots of changes at that place. <br /> <br /> Thanks for all the input.



Mick Reid

Contributing Member
*****

Australia

American-made in Oz!!
Dec 30th, 2017 03:54 PM        

"We are hundreds of miles from an authorized repair person."<br /> <br /> Ahhh, now I see...<br /> <br /> Glad it seems to have worked itself out.



back breaker



eureka, usa

Kid! STOP! you're rockin' the forest!
Jan 3rd, 2018 11:40 AM        

After talking with Fender, sent back my amp for a replacement. It was explained to me that even given the factors that could be contributing to the problem, that I should be able to crank the reverb to 10 without this happening. Friday, hopefully will be different.



Tony F



Long Island, NY

When you come to fork in road take it
Jan 3rd, 2018 05:38 PM        

All tube/spring reverbs will add hum as it's dialed up. Maybe yours is more than normal. I would try replacing the 12AT7 for starters and see if that helps and take it from there. Ask Fender to send you a replacement 12AT7 as a courtesy.



willie

Contributing Member
********

Too Near Atlanta GA

Amp Tech Emeritus
Jan 6th, 2018 01:47 PM        

Wise to send it back...what was happening was not normal. I am sure the replacement will be a keeper. <br /> <br /> w



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