[Amps] Amps Digest, Vol 39, Issue 34

[K3vw at aol.com]

To Scott, N9AA on his question about his Amp Supply LK-500ZC. Keep what you  
have Scott. You have the best bang for the buck now. The AL-1200 has a 
tendency  to oscillate at ten meters. That is why they put that little GIZMO circuit 
at  the base of the tube !! Eimac found out too and replaced that tube with 
the  3CX1200D7 and then even better , the 3CX1200Z7. Many have lost that so 
called  indestructible tube because of those problems. You don't hear about them 
but the  service folks do !! The AL-1500 is a great amp but the difference in 
drive power  needed and the power out is insignificant. Both those other amps 
tubes cost over  $700, new. I would keep the the 3-500's and perhaps buy a new 
pair from Tom's  Tubes if I thought mine were weak ! Good luck, keep what you 
got !! Willy  K3VW