[Amps] AL-1200 Tube Change Reason

[Gudguyham at aol.com]

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 at 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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