Reply To: Testing Different Tubes in 2 Stroke

[Robin]

From time to time, the question of how to get more headroom with a Two Stroke comes up.
As the Two Stroke design is very much in the vane of a “black face” style amp, it’s never going to be as clean as some other designs. But the new Tung-Sol 7581A may offer a significant delay in the onset of breakup and provide a cleaner tone at higher volumes.
JJ now offers a 7591 power tube that is similar to the 7581A as well. I will be testing these tubes and will report back.

Note: reports are that the Tung-Sol 7581 is not the same construction as the 7581A and is inferior to the 7581A. The 7581A is etched into the glass envelop on the new tube just as it was with the old original Tung-Sol version.