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[AMPS] 3-500Z amplifiers and grid current

To: <>
Subject: [AMPS] 3-500Z amplifiers and grid current
From: (km1h @
Date: Wed, 18 Mar 1998 10:25:30 EST
On Tue, 17 Mar 1998 22:20:21 EST KA2YKC <> writes:
>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 
> kits. Early testing or QA rejects may use shop tubes...cuts down the 
> when debugging. 
> Amp Supply thru brand Z amps included the serial ## of the tubes 
> with Tune and Load readings into their 50 Ohm loads. This was an aid 
> new users ( that could read)   of the initial setup parameters. 
>  >>
>Part of the problem with the TL922A distribution scheme was that the 
>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 
>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

Thanks for that explanation Eric. That certainly clears up the TL-922
question of tube/amp tracking. 
I also received a private message from another person who bought a NOS
TL-922 and '89 era tubes. Upon turn-on one tube had a little molten ball
creating arc paths around the base! He will be sending me the
tubes...this should be interesting.

73  Carl  KM1H

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