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Post subject: Dating this Twin Reverb
Posted: Fri Mar 06, 2020 9:17 am
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I am trying to date the Twin Reverb below and I'm stumped. There is no stamp on the tube placement sticker and I am unable to see the stamp on the transformer. Also the # tube types listed are not on this page (http://www.superiormusic.com/page195.htm) (4-6L6 / 2-12AX7 / 1-12AT7 / 3-7025). Any help is greatly appreciated!

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Post subject: Re: Dating this Twin Reverb
Posted: Sat Mar 07, 2020 11:17 pm
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It's a 1979 or 1980 135-watt, ultra-linear edition with non-original grill cloth and logo.

The 7025 tube was discontinued decades ago, replaced by a standard 12AX7 or 12AX7A.

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: Dating this Twin Reverb
Posted: Mon Mar 09, 2020 11:34 am
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This is the exact amp that I'm having a "distortion" issue with. Can you tell me if it starts to break up around 3-4 on the vibro channel? Master volume can be where ever... I'm feeding it a signal generator output, but it also breaks up that early with my les paul's humbucker.


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Post subject: Re: Dating this Twin Reverb
Posted: Tue Mar 10, 2020 5:19 am
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Prolly need a checkup, from a good tech. Electrolytic caps in PSU, bias supply, bypass should be replaced. Voltages checked. Speakers checked. Tubes checked.

With those Altec speakers, the amp shouldn't break-up, until it is super loud.

:mrgreen:


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