Most likely stability problems, the AL-1200 with the A7 had an extensive
type of feedback circuit. With the Z7 it is not needed.
In a message dated 9/21/2010 9:22:04 P.M. Eastern Daylight Time,
w1ksz@q.com writes:
Can someone tell me what drove the change from the A7
to the Z7 tube ??
73, Dick, W1KSZ
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