Members Sabo Posted December 29, 2009 Members Share Posted December 29, 2009 Hey i was wondering if i can plug two amp heads into my twin input 4x12 cabinet. And run my guitar through one at a time via an A/B switch....is this possible? Seb Link to comment Share on other sites More sharing options...
Members tlbonehead Posted December 29, 2009 Members Share Posted December 29, 2009 depends on if its a stereo or mono cab. Twin inputs could be either. And tube or SS. Link to comment Share on other sites More sharing options...
Members Crackpot Posted December 29, 2009 Members Share Posted December 29, 2009 If it's a stereo cab, no problem. If it's a mono cab and the amps are tube, you can't use an A/B switch but you can use something like this or this. Link to comment Share on other sites More sharing options...
Members Sabo Posted December 30, 2009 Author Members Share Posted December 30, 2009 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. Link to comment Share on other sites More sharing options...
Members Mogwix Posted December 30, 2009 Members Share Posted December 30, 2009 get the radial headbone. Link to comment Share on other sites More sharing options...
Members Gregidon Posted December 30, 2009 Members Share Posted December 30, 2009 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. Link to comment Share on other sites More sharing options...
Members crowguitar Posted December 30, 2009 Members Share Posted December 30, 2009 The fender HM4-12A has parallel input/outputs. You cant run two amps into it without using something like the Weber or Radial. You'll blow up either the amps or the cab. Link to comment Share on other sites More sharing options...
Members Dogoth Posted December 31, 2009 Members Share Posted December 31, 2009 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. Link to comment Share on other sites More sharing options...
Members mshifflett Posted December 31, 2009 Members Share Posted December 31, 2009 get the radial headbone. +1 Link to comment Share on other sites More sharing options...
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