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The difference between valve and tube

There is a difference between the valve and the tube. The valve has a sealed glass covering with electrodes inside and lets an amplifier make a tiny voltage big enough to drive a loudspeaker. The tube is an underground railway network in London.
Valves are for plumbing. :p
 
Gosh, English is tricksy.

We’ve been watching so much British cooking shows that we now habitually pronounce the “h” in “herbs”. But not so much that we’ve started putting the emphasis on the first syllable of “pecan”.