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To All My Guitar Friends...
Please be aware that adding a speaker to an amp
might be a bad thing, unless you disable the original
speaker. You must keep the total ohms that the amp
drives stay the same as it was orginally designed.
If the original speaker is 8 ohms, adding a speaker in
parallel would make the amp "see" 4 ohms. That will
stress out the secondary winding of the precious
output transformer. Eventual burnout will result.
If you try to wire the speakers in series, the amp will
see 16 Ohms, which will stress out the Primary of
said transformer. Again, premature death of the
output transformer.
my 2 cents worth...
Bill