On Dec 16, 2011, at 1:03 PM, c gennaro wrote: >They were the only tube I got consistently excellent performance from in the CCA and Collins AM's. I used to use the Amperex 4-400s in the CCA AM1000D at WCKI, but they would go flat faster in the RCA for some reason. The RCA always did good on the Eimacs, but the CCA did not like 'em. 73, Kevin Raper KJ4HYD CE WCKI WQIZ WLTQ