The amp has NOS tubes, Sylvania Black Plate JAN 6V6 GTA, and the two Preamp tubes, one is Made in Germany, The other is made in Gt. Britain.
I think they sound wonderful!!
I had a set of JJ 6V6s in it but they sounded a little harsh,... Brittle and piercing/
These Sylvanias are warm and full and sound great...
S