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Re: [Amps] Hunter 2000c Low Output.

To: Charles Hedrick <>,, Mitch Cox <>
Subject: Re: [Amps] Hunter 2000c Low Output.
From: Tim Kass <>
Date: Sun, 17 Jul 2011 08:03:59 -0700 (PDT)
List-post: <">>
I also have the wonderful Hunter 2000C amp... My standing voltage is 2700 
VDC...same caps ... this amp has a diode block arrangement, very heavy duty 
parts.  Make sure you are running the AUX LOAD in the 0 position on the lower 
bands and try it again it a dummy load on 40 meters to start.  ALSO -- this amp 
was designed for Amperex 8163 (3-400z) and mine ran well with the original 
8163's in it...however, I have tried several pairs of Eimac 3-400z and it 
doesnt like (2) running together....very  low output...300 watts.. take one of 
the tubes out and run it briefly as a single tube and see what output you 
get... I now run a single 3-500Z Eimac and does some more coming to 
try to run a pair of them.. but if you amp runs fine on the single 
can then eliminate some of the other issues... high SWR input from solid state 
tubes doesnt seem to bother it to much but I have an IC-746PRO and use the 
internal tuner to balance things..but unless
 the SWR is over 3:1 between the radio, the amp doesnt seem to mind... I also 
use the Heathkit AMPKEYER for good measure.    Great amp, I have had 2 of 
these..will never sell this one..
73, Tim K8WBL

--- On Sun, 7/17/11, Mitch Cox <> wrote:

From: Mitch Cox <>
Subject: Re: [Amps] Hunter 2000c Low Output.
To: "Charles Hedrick" <>,
Date: Sunday, July 17, 2011, 12:30 AM

The first thing I would be looking for after first checking the incoming AC 
voltage would be an open rectifier or capacitor in the power supply section. 
But first you need to make sure that the incoming line voltage is where it 
should be. From the report of a bad match between the radio and amp you almost 
would want to look in the bandswitch section of the tuned input if one exists 
but that would have no effect on the plate voltage.
  ----- Original Message ----- 
  From: Charles Hedrick 
  Sent: Saturday, July 16, 2011 10:11 PM
  Subject: [Amps] Hunter 2000c Low Output.

  HI All,
  This has me puzzled.  HV is 2800 down from 3400 which is normal in this
  small town this time of year.  I noticed yesterday that the power level was
  fluctuating weirdly up and down. when tuning the amp into the dummy load.
  So last night I installed new  3-500ZG's  and cooked them for 24 hours.  I
  just tried the amp again and the power out is way down, the rig is seeing a
  high SWR.  Bad Tubes....I just pulled a pair from the AL-82 and got the same
  results.  I installed the new pair in the AL-82 and got 1300 key down with
  65 watts drive.  The HV on the hunter doesn't fluctuate, and I'm .38 amp and
  300 output with HV dropping to 2400 at key down.  The AL-82 is seeing the
  same HV drop by the way, but handles it better, 85 watts drive is 1500 CW
  with the new tubes.  Parasitic Suppressors bad?   Stumped here.
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