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A tube power amplifier (like the final stage in your Mark V) has to have an output transformer to lower the output impedance (the "Ohms") to a level appropriate to drive a speaker. What does that mean? Well if you know what voltage and current and power are, then one way to look at impedance is how much of the power you are putting out is in voltage and how ...


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One test is to attach a small battery - 1.5v is fine - to each speaker. The cone should jump either in or out on contact. This is mainly for checking the polarity of each speaker, so that they can be connected in series or parallel properly. Connect each individually, not while in circuit. It will tell whether a speaker is still responding, although if ...


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I think the (only?) safe way to go here is to shell out another couple of bucks and buy a guitar to iPhone interface, so that you can connect the high impedance input of the guitar to the iPhone which, in turn, will act as an amplifier simulator and output the processed signal to the speakers. The IK iRig is pretty cheap, but not the only choice: ...



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