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Chris K-Man wrote:
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According to some of the 'experts' on here, those back side labels for impedance are "meaningless".

** Who the heck are they ?????

I choose to follow what the label says.

** OK - but meaningless it ain't .

It will indicate, within a small margin of error the load impedance that gives the most clean watts.
Usually having double the number is harmless, but less powerful.
Going to half will shorten tube life or find any weak tube and make it fail.

Fact:

Many Fender *combo* amps, made in the 60 and 70s, have two speaker jacks on the back, wired in parallel.
Fender Twins Reverb and the like.

One customer of mine ( who played regularly in a local band) thought this meant there was additional power available to add an extension speaker. He was wrong and suffered very short tube life.

I only found out by seeing him playing at a gig.


....... Phil