Thanks Joe and all: They're for my Dynaco. I made the kit amp, preamp and tuner...wrote the date: 12/5/1969. Just now replacing the tubes...no real need as the 6CA7's are borderline..at least 3 of the 4...I broke the glass on the 4th...the preamp 12AX7 are NG...as are the 7199's. Never heard Jimmy Hendrix "Purple Haze" any better!!! 73, Steve