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Building a Guitar Amp Cabinet
Building a Guitar Amp Cabinet
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Old 29th May 2012, 08:45 PM   #11
Austin Translation is offline Austin Translation  United States
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FWIW you can safely run less impedance than optimal on a tube amp but don't go much higher- You can run 4 ohms or even two ohms no prob but dont try hooking up a 4x12 cab in series for 32 ohm. The opposite is true for solid state.

The load is reflected back to the tube, if you have 5k output transformer with 8 ohm speaker then you hook up 16 ohm speaker (two eight ohm in series) the output tube will see a 10k load instead. Alternately if you hook up a 4 ohm speaker (two eights in parallel) then you will load the output tube with 2500 ohms instead. This (less ohm load) usually results in more second harmonic distortion which imo sounds good for guitar.

Not hooking any speaker up at all with the amp on can hurt the output tube and make it arc inside. However completely shorting the wires is harmless.

Last edited by Austin Translation; 29th May 2012 at 08:52 PM.
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