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Post subject: 72 twin reverb looses sound quality
Posted: Sat Jan 04, 2020 12:39 pm
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after being played for a couple hours the sound gets all mushy, it looks like the main caps under the tray have been replaced semi recently but all others on the board appear to be original, my guess is something is getting hot and loosing its value, I have a new complete recap kit with 16 caps and transistors, and have replaced all 4 6l6's and 4 preamp tubes, any thoughts on how to fix my dilemma???? TIA for any advise.


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Post subject: Re: 72 twin reverb looses sound quality
Posted: Mon Jan 06, 2020 1:23 pm
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You say you have a cap kit. Just to be clear... Did you install it?
Capacitor failures usually come with crackly noises. Resistor failure is closer to your description.
Solder failure on a tube socket is also a possibility.


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Post subject: Re: 72 twin reverb looses sound quality
Posted: Mon Jan 06, 2020 2:01 pm
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I don't know, but are you anywhere near Wappingers Falls, New York? I know a guy who can fix it.


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Post subject: Re: 72 twin reverb looses sound quality
Posted: Mon Jan 06, 2020 3:12 pm
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Sounds like the amp is ready for a full bench-check by a qualified technician......

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: 72 twin reverb looses sound quality
Posted: Tue Jan 07, 2020 9:10 am
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Retroverbial wrote:
Sounds like the amp is ready for a full bench-check by a qualified technician......

Arjay


Best advice. Especially for any dormant gear, before use.


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Post subject: Re: 72 twin reverb looses sound quality
Posted: Wed Jan 08, 2020 1:43 pm
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Retroverbial wrote:
Sounds like the amp is ready for a full bench-check by a qualified technician......

Arjay



100 % right.


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Post subject: Re: 72 twin reverb looses sound quality
Posted: Sun Jan 12, 2020 10:16 am
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dpollick wrote:
after being played for a couple hours the sound gets all mushy, it looks like the main caps under the tray have been replaced semi recently but all others on the board appear to be original, my guess is something is getting hot and loosing its value, I have a new complete recap kit with 16 caps and transistors, and have replaced all 4 6l6's and 4 preamp tubes, any thoughts on how to fix my dilemma???? TIA for any advise.


thanks for the responses guys, I have a tech working on the cap kit, which has the needed resistors in it, I don't have enough confidence in my soldering skills so took it to a guy that does this for a living, will post again when I get the amp back Thanks again


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Post subject: Re: 72 twin reverb looses sound quality
Posted: Sun Jan 12, 2020 11:19 am
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Hope it works out -- Twin Reverbs are beautiful-sounding amps.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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