Could be that C2 or C3 are open. Both are 0.1 and are on the Display Board
and are across the meter. Could cause a dampening problem as you describe.
73
Bob, K4TAX
----- Original Message -----
From: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Thursday, August 11, 2005 5:22 PM
Subject: Re: [TenTec] Centurion Plate Current Meter
Mike - I fired up the Centurion -- The new plate meter is well damped --
With a final plate current of 600 ma it goes up to 667 ma and drops back
to 600 ma - no undershoot with key up.
The grid / multimeter is not nearly as well damped -- With Ig set at 240
ma steady state , key down it goes to just about full scale 400 ma , down
to 160 ma , back to 280 ma , back down to about 180 ma then two or three
small swings to 240 ma . This is how the old plate meter was . As a
matter of fact I did not remember the new multimeter being that bad but
maybe I just did not look at it that closely -- FWIW -- Hank K7HP
----- Original Message -----
From: "Michael Tope" <W4EF@dellroy.com>
To: <tentec@contesting.com>
Sent: Thursday, August 11, 2005 7:16 AM
Subject: [TenTec] Centurion Plate Current Meter
I am checking out a Ten-Tec Centurion 422 (2 x 3-500z)
amplifier for a friend. This morning I fired it up on 20 meters
(into a dummy load) for this first time. Everything looked
good (output power, tuning, etc) except for the plate current
meter. For some reason the plate current meter on this unit
overshoots horribly (close to full-scale) and then oscillates
back and forth a few times (~+/- 200mA) before settling to
the key-down reading. Is this normal for this meter? The
grid current/multimeter doesn't do this, nor does just about
any other meter I ever seen.
Thanks,
Mike, W4EF...................................
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