[Drake] Matching 6JB6's with a Tube Tester

[Bob Stein]

Mark NAce wrote:
> Dear group,
> I have seen several folks mention that Drake finals can be matched using a good tube tester like a 6000A or TV.  I have also heard that Drake used to match their finals with a testing setup that used the same plate & screen voltages, bias, etc. as a working rig, by measuring the cathode current.  Does anyone have an opinion?  
> Thanks for your time
> Mark, N5KAE
> 
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Obviously testing the tubes under near operating conditions is to be 
preferred.  However, this is hardly convenient for the average user.  So 
the next best method is to check the tubes on a good transconductance 
(not an emission) tester.

Bob, W6NBI