gofar99 Messages: 1949 Registered: May 2010 Location: Southern Arizona
Illuminati (5th Degree)
Hi, The tubes were pretty cheap about three months ago. One site had them for under $10 each NOS. BTW the amp is a pretty good heat source on cold days. This one seems a bit less efficient that most of my other similar designs. As class "A" U/L amps they are not efficient to start with.