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Fwd: [AMPS] 3-500Z amplifiers and grid current

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Subject: Fwd: [AMPS] 3-500Z amplifiers and grid current
From: (KA2YKC)
Date: Tue, 17 Mar 1998 22:27:41 EST
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From: KA2YKC <>
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Subject: Re: [AMPS] 3-500Z amplifiers and grid current
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Date: Tue, 17 Mar 1998 22:20:21 EST
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In a message dated 98-03-17 19:17:32 EST, you write:

<< Maybe in your version of reality.  In the real world amps are final
 tested AND shipped with the same tubes.  Of course this does not include
 kits. Early testing or QA rejects may use shop tubes...cuts down the cost
 when debugging. 
 Amp Supply thru brand Z amps included the serial ## of the tubes along
 with Tune and Load readings into their 50 Ohm loads. This was an aid to
 new users ( that could read)   of the initial setup parameters. 

Part of the problem with the TL922A distribution scheme was that the amplifer
was never "paired" with a "particular" set of Eimac 3-500Z's. I know of 2 or 3
people who bought new TL922's, to find that the dealer just pulled the closest
set of 500's to ship with it. Maybe if Kenwood actually did test the amp with
a particular pair and noted the tube's stamping, they would have fixed some of
the problem-prone units in the first place. One would surmise that they tested
each amp at the factory with a lab-set of tubes, which probably exhibited less
gain than those most of us 922 owners wound up with.

73 Eric

73 Eric


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