7591 - 7868 - 6GM5
The 7591 is a great tube with a unique sound and character. The 6GM5 and 7868 are essentially the same tube but they do have different pin-outs so they would require an adapter to be ran in place of the 7591.
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New JJ 7591 Vacuum Tube
JJ Electronic
$31.52New Plate Current Tested JJ 7591 Vacuum Tube There is finally a reliable 7591 that rivals the originals. These JJs are an excellent choice for your old Scott amplifier as well as many others that...$31.52