Fender Twin Reverb suddenly too bright

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ncarey13
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Fender Twin Reverb suddenly too bright

Post by ncarey13 » Fri Aug 28, 2020 7:39 am

I have a Fender Twin Reverb that I've owned for about 7 years. I can't remember off had how old it is exactly, as I'm the third owner. It's worked perfectly until recently its become very bright. Like almost obnoxiously bright. Even with the treble down low and bass all the way up it's still very bright. Could this be a possible tube issue? Also, it makes this crackling sound while playing for around 5 minutes and then it goes away. This is only when it's first turned on. It's only started doing this just before the issue with the brightness. Any help would be greatly appreciated.
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Re: Fender Twin Reverb suddenly too bright

Post by sookwinder » Fri Aug 28, 2020 8:17 am

How long ago were the electrolytic capacitors replaced?
relaxing alternative to doing actual work ...

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Re: Fender Twin Reverb suddenly too bright

Post by StevenO » Fri Aug 28, 2020 8:43 am

Bright switch in the "on" position?

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Re: Fender Twin Reverb suddenly too bright

Post by ncarey13 » Fri Aug 28, 2020 9:05 am

sookwinder wrote:
Fri Aug 28, 2020 8:17 am
How long ago were the electrolytic capacitors replaced?
I've never replaced anything. I'm not sure if anything was replaced before I got it.
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Re: Fender Twin Reverb suddenly too bright

Post by ncarey13 » Fri Aug 28, 2020 9:06 am

StevenO wrote:
Fri Aug 28, 2020 8:43 am
Bright switch in the "on" position?
No, it's off. That's the first thing I checked.
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Re: Fender Twin Reverb suddenly too bright

Post by mbene085 » Fri Aug 28, 2020 2:49 pm

How old of a twin are we likely talking here? If this is a vintage one, I'm willing to put money on the electrolytic caps. I had almost the identical symptoms ~15 years ago and it was the caps drying out.

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Re: Fender Twin Reverb suddenly too bright

Post by StevenO » Sat Aug 29, 2020 2:34 am

Could be an electrolytic issue... I would have thought other things would have been affected other than just merely becoming too bright.

Is this you plugging directly into the amp with no effects in between? No was in the forward and on position? Tried different cables? Different guitars? Ritual sacrifice? Indian burial grounds? Achy breaky heart?

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Re: Fender Twin Reverb suddenly too bright

Post by ncarey13 » Mon Aug 31, 2020 11:54 am

mbene085 wrote:
Fri Aug 28, 2020 2:49 pm
How old of a twin are we likely talking here? If this is a vintage one, I'm willing to put money on the electrolytic caps. I had almost the identical symptoms ~15 years ago and it was the caps drying out.
I think it's around 15-20 years old. Not a vintage one.
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Re: Fender Twin Reverb suddenly too bright

Post by ncarey13 » Mon Aug 31, 2020 11:57 am

StevenO wrote:
Sat Aug 29, 2020 2:34 am
Could be an electrolytic issue... I would have thought other things would have been affected other than just merely becoming too bright.

Is this you plugging directly into the amp with no effects in between? No was in the forward and on position? Tried different cables? Different guitars? Ritual sacrifice? Indian burial grounds? Achy breaky heart?
I've tried plugging straight in with no effects. I've tried with the bright on and off and the bright works making it even brighter. I've tried different cables as well. Doing some digging around online others have had similar problems but it was a tube issue. When I get back to our practice space this week I'm going to see if that may be the case.
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Re: Fender Twin Reverb suddenly too bright

Post by Larsongs » Mon Aug 31, 2020 9:20 pm

You should Test the Tubes before doing Caps etc... Also, check to make sure there's no loose Connections in the Tubes or Wiring etc..

Start with the simple Stuff...

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Re: Fender Twin Reverb suddenly too bright

Post by timtam » Mon Aug 31, 2020 10:18 pm

And of course be aware of where high voltages can hide, even in unpowered amps.

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Re: Fender Twin Reverb suddenly too bright

Post by ncarey13 » Tue Sep 01, 2020 7:53 am

Thanks for all the input. When I get the problem nailed down, I'll report back.
They don't advertise for killers in the newspaper. That was my profession. Ex-cop. Ex-blade runner. Ex-killer.

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