Got both tubes on ebay... the 6AS7 I've had for a number of years, but it did not behave well in another circuit. In the crack it's awesome. The 12AU7 was a recent auction that also had a mullard in it. The mullard turned out to be bad.
This amp's sound can be greatly improved by rolling other tubes through it until you find one that you like.
If you hunt on ebay long enough you should be able to snag some tubes on the cheap.
