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Put these in my Origin 50H. Nice fat thumpy yet articulate power tubes. The highs still bite but don't get harsh or ice picky. I play the Marshall amp volume 2:30pm and gain at 2:30 pm. Well into its power section. With this amp the volume and gain both give you overall volume. Different than my other Marshallz. Amps plugged into a GB loaded 412. Love the price and performance with the JJ 6CA7'S.