[Amps] Matched set 8122's needed

[Van K7VS]

I don't know, but can tell you that I had to to eventually replace a bad 
tube in each of the ncl-2000's I was running at the time and I simply bought 
a pair for each amplifier at somewhat different times.  They certainly were 
not matched and they ran hard in the two amps for several years back in the 
early seventies and finally sold them with full output according to what 
National said.

I am sure some purist will tell you they must be matched.  And lots of 
gobblygook about why, but over the years,  I have run a lot of amplifiers 
without worrying about "matching" tubes including the two Alpha's that I 
have now.
Van K7VS 


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