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Re: Amp problems? Ohm questions? Amp blowing up for no reason, READ ME!
Quote:
Originally Posted by thelorddread
hey guys
man i thought i was sure of this but now im feeling weird.
i have jcm900 combo and im not sure if the 12s are 8 or 16 ohms?
for whatever reason i was under the impression that they were 16
but maybe im very wrong?
i also have the jcm 900 1960a cab.
which i was under the impression that those were 16ohm speakers too.
so i thought if the ohmage matched in a parallel setup, it would be the 8
ohm setting on my amp.
geeze im confused now.
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The correct and safest way to use your combo with the cabinet is to disconnect the speaker within the combo and rewire the JCM900 cab to 4ohms and use the 4ohm output on the combo to run it.
The speaker in the combo is an 8ohm speaker. The switch on the back of the combos only goes from 4ohms or 8ohms, so it's always supposed to be on 8ohms when used on it's own and can only be used with an extension cabinet that is 8ohms, then you would set the head to 4ohms.
Hope this makes sense. There are a few places to view easy to read wiring diagrams. Rewiring a cab is very simple and is always best to check with a multimeter before plugging in to make sure it's right.
Jumbo Sunshade - Speaker Wiring Diagrams
Wiring a 4 X 12 Speaker cabinet
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Transformers inside amplifiers were not originally designed to be in there, and the tube was not created for the guitar amp.
ANY recommended idle current is a guideline and in no way a necessary requirement. There is no skeleton key for any tube amp.
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