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A/B-ing 2 amps into one cab


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Cool thanks. Yeah its a tube amp (Marshall JCM2000 DSL) into a fender HM4-12A. Actually i dont know if the cab is stereo or mono, just that it has two 8 ohm inputs.

 

 

Plug in a short speaker cord into one input and touch a 9V battery to the tip and sleeve. If all four speakers pop out (or in) then it's a mono cab. If only two speakers move it's a stereo cab. DO NOT PLUG TWO AMPS INTO A MONO CAB. You will likely destroy the output stage of one or both amps.

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A simple A/B switch will leave one of your amps without a load on the output. Tube output transformers are fussy about being loaded correctly. They will melt down (and are really expensive to replace). That's why on tube amps you often see different jacks for 4 ohm, 8 ohm, 16 ohm etc.... They are different taps on the transformer secondary side.

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