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FDP Forum / Amp Mods, Repairs, and Projects / Extension Cab Output for a Vibro Champ

Contributing Member

Toronto, Canada

Sep 26th, 2017 01:51 PM   Edit   Profile  

Hi all... I have an early '70s silverface Vibro Champ. Lovely little amp, but the small speaker is limited, and I'd like to run an extension cab with amp for some uses. Of course, there's no output on the amp for a cab. So, my question: Is it possible to have such an output installed? Will the amp's chassis handle the mod?

Thanks in advance!

Contributing Member


North of I10
Sep 26th, 2017 02:38 PM   Edit   Profile  

I used to run a 4 ohm 2x12 cab with mine. All you need is a RCA (amp side) to 1/4" jack cable or whatever your extension cab needs. This will disconnect the in cab speaker. Mine sounded great through the 2x12 but I eventually put it in a larger cab with a Weber P12-Q and got rid of the 2x12 cab. Really easy to do this all you need is a cable. Stay as close to 4 ohms as possible.

Contributing Member

American Patriot

About as ordinary as you can get.
Sep 26th, 2017 08:35 PM   Edit   Profile  

Yep, 4 ohm total load not matter what speakers you use. You don't need those big, heavy duty speakers for a Champ. A 4 ohm, light duty old Jensen would sound great.

Contributing Member

Toronto, Canada

Sep 26th, 2017 09:46 PM   Edit   Profile  

Thanks for the advice. This looks easier than I was expecting. Cheers!

Contributing Member

I tried to think

but nothing happened!
Sep 27th, 2017 03:00 PM   Edit   Profile  

I replaced the RCA type jack with a 1/4 inch phono jack on my Vibrochamp (very easy) and used a 8 ohm 12" cab with it. Sounded awesome cranked with no problems.

FDP Forum / Amp Mods, Repairs, and Projects / Extension Cab Output for a Vibro Champ

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