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Re: [Amps] Hunter 2000c Low Output.

To: "Carl" <km1h@jeremy.mv.com>, "Tim Kass" <k8wbl@yahoo.com>, "Charles Hedrick" <cchedrick@gmail.com>, <amps@contesting.com>
Subject: Re: [Amps] Hunter 2000c Low Output.
From: "Mitch Cox" <ww4cox@embarqmail.com>
Date: Sun, 17 Jul 2011 15:22:29 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
No, actually I am a veterinarian and I know a good horses ass when I see one.
  ----- Original Message ----- 
  From: Carl 
  To: Mitch Cox ; Tim Kass ; Charles Hedrick ; amps@contesting.com 
  Sent: Sunday, July 17, 2011 3:01 PM
  Subject: Re: [Amps] Hunter 2000c Low Output.


  Hmmmm, without a callsign you may even be a CBer for all we know, that might 
explain things.


    ----- Original Message ----- 
    From: Mitch Cox 
    To: Carl ; Tim Kass ; Charles Hedrick ; amps@contesting.com 
    Sent: Sunday, July 17, 2011 2:38 PM
    Subject: Re: [Amps] Hunter 2000c Low Output.


    During the past 35 years I have seen well over 100 Hunter amplifiers come 
in and go out. Doesn't matter what's involved the gentleman explained his 
problem well. It doesn't matter what is supposed, what matters is his problem 
which I thought he explained well. Why not address the problem rather than to 
tell him what is "supposed". If the initial voltage reading is inaccurate as to 
it's number, it is still accurate to it's loss weather it is factory correct or 
not. Where is your reasoning powers? I am just not as readily bullied as some 
that have been here and I stand by what I said to start with which in the end 
will prove to be correct as you will see in the end. 
      ----- Original Message ----- 
      From: Carl 
      To: Mitch Cox ; Tim Kass ; Charles Hedrick ; amps@contesting.com 
      Sent: Sunday, July 17, 2011 1:43 PM
      Subject: Re: [Amps] Hunter 2000c Low Output.


      Explain where you have seen 100  2000C's please?

      As far as your other comments it shows poor troubleshooting logic to not 
ascertain exactly what is involved. What if the voltage reading is simply 
wrong?????

      Lets get back to trying to help the OP and not start some silly chest 
pounding using overblown graphics.

      Carl
      KM1H

        ----- Original Message ----- 
        From: Mitch Cox 
        To: Carl ; Tim Kass ; Charles Hedrick ; amps@contesting.com 
        Sent: Sunday, July 17, 2011 12:28 PM
        Subject: Re: [Amps] Hunter 2000c Low Output.


        Regardless of what the correct plate voltage should be, he says his was 
at 3400 volts and now that has fallen a considerable amount with output power 
going down with it. This would seem to indicate one of two things, either the 
primary main voltage has dropped or something has happened in the power supply 
to cause the drop in voltage or loss in output. I addressed the problem, not 
what it is supposed to be. I have seen a hundred of these amps and very few 
have the factory parts in them as they started life so his first statement of 
3400 volts could be absolutely correct. As far as heavy duty goes, I don't 
think I could put any Hunter amp in that category.
          ----- Original Message ----- 
          From: Carl 
          To: Tim Kass ; Charles Hedrick ; amps@contesting.com 
          Sent: Sunday, July 17, 2011 11:44 AM
          Subject: Re: [Amps] Hunter 2000c Low Output.


          That is the correct standby voltage and it should drop to 2200-2300 
under 
          full load.

          I dont understand why the Eimac 3-400Z should be a problem. It is a 
little 
          harder to drive but otherwise a zero bias compatible tube. Ive 
swapped them 
          as well as mixed in other 3-400Z amps.
          Hunter claims either are permitted altho the Amperex is recommended 
likely 
          since its a bit easier to drive.

          The same with a 3-500 as it should run fine at zero bias at that 
voltage 
          altho about 5.1V bias will improve the IMD about 6dB.

          Carl
          KM1H


          ----- Original Message ----- 
          From: "Tim Kass" <k8wbl@yahoo.com>
          To: "Charles Hedrick" <cchedrick@gmail.com>; <amps@contesting.com>; 
"Mitch 
          Cox" <ww4cox@embarqmail.com>
          Sent: Sunday, July 17, 2011 11:03 AM
          Subject: Re: [Amps] Hunter 2000c Low Output.


          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 well..got 
some 
          more coming to try to run a pair of them.. but if you amp runs fine 
on the 
          single tube...you 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 <ww4cox@embarqmail.com> wrote:


          From: Mitch Cox <ww4cox@embarqmail.com>
          Subject: Re: [Amps] Hunter 2000c Low Output.
          To: "Charles Hedrick" <cchedrick@gmail.com>, amps@contesting.com
          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
          To: amps@contesting.com
          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.
          Thanks,
          Cam
          WA4JKW
          NCS MMSN
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