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Post subject: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Thu Jun 18, 2015 9:42 pm
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https://youtu.be/YeWarY7nCac

This is a sound quality comparison of a stock 1973 Fender Twin Reverb and a stock November 2014 Fender 68' Custom Twin Reverb. It might not be much of a fair comparison though, a 42 year old amp against one that is not even a year old yet.

The 1973 Twin Reverb still has the stock preamp tubes in it as well, so that's gotta suck also..

Let your ears be the judge. I really would like to know whats up with the quality of Fender Amps. This is the second 68' Custom, the first one was worse and when I got this one as a replacement, it flamed out on around the third day. And this is how it was returned to me from the shop after they supposedly fixed it.

I have not been playing the 68' Custom Twin Reverb because the humming and hiss is very annoying and it is just a waste of my money to have a pretty package with crap components.

So I guess it is back to the shop, at least they do honor their warranty work. They are going to need to on this line of amps.

One more thing the 1973 Twin Reverb I bought for $650.00, the 68' Custom Twin Reverb cost me $1300.00, four trips to the shop so far, one replacement amp and it still sounds like crap.

I have four other Fender amps, a 65 Deluxe Reverb Re-Issue, Blues Deluxe Re-Issue, Blues Deville 4 x 10 and a 1976 Musicamaster. Damn fine amps and none of them hum and hiss like the 68' Custom Twin Reverb. And I have not taken any of those to the shop, ever.

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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Sat Jun 20, 2015 2:32 am
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I often read here some complains about Custom series .

Try your old TR tubes ( 12XX7 ) in your new Custom TR.

IMO you old Twin Reverb could be more quiet . I hear some white noise coming from noisy tubes's plate resistors.


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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Sat Jun 20, 2015 7:13 am
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No difference with a tube swap in the preamps. I am running all of my power through a Tripplite LC2400 EFI/RFI filter conditioner, so I am pretty sure the ac power is not causing the issues. All of my other tube amps sound fine running through that filter.

That 1973 is going to get some work as soon as I have another Twin Reverb that plays well enough to take it's place. The only thing I have done to that amp is dust it off and put new speakers in it. It has an Eminence Lil Texas and an Eminence Tonkerlite. They sound awesome and it made it a lot easier to lug around.

I just want the 2014 68' Custom Twin Reverb to work and sound good, like my other amps. It is a hell of a distraction to creativity when you have crap equipment. I am planning on keeping that amp stock until the warranty runs out and if it breaks after that, it's getting new innards. Old school innards, not that cheesy $@! mass production geek $@! crap.

Although I do have a few Fender amps with those type of components that sound pretty decent, they were made a few years back, not sure what has happened to the QC.

I really think that since the Twin Reverb is one of Fender's flagship amps, more care should be taken to insure that the quality of that line of amps should be job one. If they are just trying to please the share holder's bottom line by using cheap components, cheap labor and bad QC to keep the dollar signs up, instead of catering to the musicians that actually use their stuff, screw them.

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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Sat Jun 20, 2015 8:51 am
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majorbytes wrote:
No difference with a tube swap in the preamps. I am running all of my power through a Tripplite LC2400 EFI/RFI filter conditioner, so I am pretty sure the ac power is not causing the issues. All of my other tube amps sound fine running through that filter.

That 1973 is going to get some work as soon as I have another Twin Reverb that plays well enough to take it's place. The only thing I have done to that amp is dust it off and put new speakers in it. It has an Eminence Lil Texas and an Eminence Tonkerlite. They sound awesome and it made it a lot easier to lug around.

I just want the 2014 68' Custom Twin Reverb to work and sound good, like my other amps. It is a hell of a distraction to creativity when you have crap equipment. I am planning on keeping that amp stock until the warranty runs out and if it breaks after that, it's getting new innards. Old school innards, not that cheesy $@! mass production geek $@! crap.

Although I do have a few Fender amps with those type of components that sound pretty decent, they were made a few years back, not sure what has happened to the QC.

I really think that since the Twin Reverb is one of Fender's flagship amps, more care should be taken to insure that the quality of that line of amps should be job one. If they are just trying to please the share holder's bottom line by using cheap components, cheap labor and bad QC to keep the dollar signs up, instead of catering to the musicians that actually use their stuff, screw them.


Ironic isn't it that Fender's biggest competitor are the products they made some thirty, forty, or fifty years ago......?

:lol:

Arjay

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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Sat Jun 20, 2015 10:20 am
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What wrong with this amps if good tubes did not remove noise !

Bad desing on printed circuit ? How can you can you fix it ? It is not Point to Point like your old TR.

I will return for a refund .


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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Sat Jun 20, 2015 4:34 pm
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To late for a return, so I am stuck with it for now. If they can get it working correctly, I will not have a problem using it, I will have a backup amp though..

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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Sun Jun 21, 2015 9:08 am
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Most of the modern Fenders have much higher internal gain than the vintage equivalents. Where a SF twin may put out a volt, the modern ones put out five. So your problem may be normal operation.
This translates to more hiss at the same number volume settings. The test is to adjust the amps to the same loudness with a guitar and compare hiss levels then.
You may find that the old Twin loudness at five equals the new twin at 2
There still shouldn't be any hum though. That could be a mismatch of the power tubes.


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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Sun Jun 21, 2015 10:20 am
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I have no first-hand knowledge regarding the Custom 68 Twin Reverb but years ago I had occasion to compare the '65 Blackface TRRI with an original '67 blackface and the voltage and current draws between the two layouts were virtually identical. It appears to me that the '68 Custom circuit has been bastardized to the point that it's incapable of delivering a clean signal regardless of how skillfully tweaked the idle bias or how carefully selected the tube array is.

Yet another "epic fail" for FMIC.

Arjay

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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Sun Jun 21, 2015 11:43 am
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Hey majorbytes, have you checked to see what the bias is? this may be all there is to it, that and swap the power tubes around. It also wouldn't hurt to move the pre amp tubes around a bit.


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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Sun Jun 21, 2015 3:07 pm
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majorbytes,

The video clip: https://youtu.be/YeWarY7nCac

Sounds like PSU filtering issues. Wonder what brand of caps and type of resistors Fender is putting under the doghouse in that '68 Custom Twin Reverb? Does the power rail include a proper sized, current rated choke?

:scratcheshead: :D


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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Sun Jun 21, 2015 4:23 pm
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I'd keep working with the Fender repair center, and work with the repair dept tech to show him the issue. Sometimes things don't get solved the first time. Tell them when you turn up the volume the noise goes away, like your video shows. Maybe they can do something to minimize noise, beyond the stock circuit.

In other words take it back and work with them, tell them its not fixed, and ask for warranty repair. Hopefully it can get better or workable so you can use the amp. Try out another amp of the same kind, a 68 custom Twin one for comparison.


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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Mon Jun 22, 2015 1:48 am
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Relic G Man wrote:
Hey majorbytes, have you checked to see what the bias is? this may be all there is to it, that and swap the power tubes around. It also wouldn't hurt to move the pre amp tubes around a bit.



If one or few output power tube is bad this can make noise . Cold or hot bais do not make this noise


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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Mon Jun 22, 2015 1:52 am
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jackhammer wrote:
I'd keep working with the Fender repair center, and work with the repair dept tech to show him the issue. Sometimes things don't get solved the first time. Tell them when you turn up the volume the noise goes away, like your video shows. Maybe they can do something to minimize noise, beyond the stock circuit.

In other words take it back and work with them, tell them its not fixed, and ask for warranty repair. Hopefully it can get better or workable so you can use the amp. Try out another amp of the same kind, a 68 custom Twin one for comparison.



+1

It might be some wires between PCB 's boards or other kind of wire ...I see some wire strip use in amps like Blues Deville making noise if are not bend like it do


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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Mon Jun 22, 2015 5:55 am
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I am taking the 68' Twin to the service center today..
I noticed all of the power tubes have dark circles on one side of the tubes, not sure if that is normal. That amp has very few hours on it. All of my other 6L6 tubers do not look like that...

I have a original Blues Deville 410 and it use to hum also.. I replaced all of the pcb mounted jacks and pots and hard wired them with some good ones and the problem went away..

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In the hands of the right people it can change the world. Not bad for a hunk of ash, a few magnets, and some wire.
Band Site
http://www.reverbnation.com/bigskybluesband
Demos
http://www.youtube.com/user/bigskybluesband


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Post subject: Re: 2014 Fender 68' Custom Twin Reverb Hum Issues
Posted: Mon Jun 22, 2015 6:07 am
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majorbytes wrote:
I am taking the 68' Twin to the service center today..
I noticed all of the power tubes have dark circles on one side of the tubes, not sure if that is normal.
Yes normal
That amp has very few hours on it. All of my other 6L6 tubers do not look like that...

I have a original Blues Deville 410 and it use to hum also.. I replaced all of the pcb mounted jacks and pots and hard wired them with some good ones and the problem went away..
Input jacks; If switching ground contact is dirty = hum . most of the time you can clean it
Pots itself never do hum , could make noise scratch if dirty ; a good contact cleaner will fix it
Replace wire with good ones !!! What is a good one ? Why they are "bad " ?








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