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Weak output tubes will play, but not as loud and not that long... especially in a push-pull amp, where much of the distortion will cancel. But the tube tester data could be qestonable too - do similar tubes like 6F6, 6K6, 6L6 test OK? (6AQ5, 6CM6, 6CZ6 should have the same settings except for pin settings, 12AB5, 12V6, 12AQ5 also are the same but with heater set to 12V)
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