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I’ve been asked about substituting different output tubes in the Special 6. We’ve tested it with all of the usual guitar amp output tube types, and it works fine with all of them, thanks to its cathode-biased output stage. Beware that larger tubes can stress the power transformer’s heater winding current capability, so if you really like the sound with a EL34, 6550 or KT88, turn it off and let it cool down every hour or two.

You can also experiment with different output transformer taps. The Special 6 has a sturdy oversize output transformer; it’s wound for a 9k ohm plate impedance. If you prefer the more aggressive sound of a lower plate impedance, you might prefer running an 8-ohm speaker off the 16 ohm output jack.