On Fri, Jun 24, 2022 at 12:42 PM Danny Pease <w9dp at w9dp.us> wrote: > Isn't the FU728 the tubes used in recent Alpha Amplifiers? They are > listing the tubes as 4CX1500B but I thought they were using Chinese tubes. > W9DP > The Alpha 8410 uses two Chinese made 4CX1500B tubes, and the Alpha 9500 uses one Chinese made 3CX1500A7. Glenn AE0Q