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I discovered JJ tubes about a year ago after obtaining some new amps and starting a business of repairing them. I find these to be great sounding and recommend them to customers as a low cost option to re tubing with NOS or other more expensive brands. I can attest by doing several sounds tests that JJs, especially these EL84s, sound great, provide a wide range of tone, and do well at bringing dead amps back to life. I've tried GTs, EHs, and Sovteks as singles and in matched kits and I can say that JJs usually out perform the other kinds hands down. Great product!