[Amps] RF Parts OEM 3-500ZG's

[k7rdx]

I was impressed the first 3KA I worked on by the sheer size of the tank circuit components as well as the input network layout. The thing that really looks out of place is the 3-500z tubes...It seems to me 3cx3000a7 would look right at home in there...Or pair 3cx1200a7....Bet you wouldn`t flat top those tubes in the old Henry..Jim.
  ----- Original Message ----- 
  From: Joe Isabella 
  To: k7rdx ; Gudguyham at aol.com ; amps at contesting.com 
  Sent: Tuesday, August 09, 2005 9:59 AM
  Subject: Re: [Amps] RF Parts OEM 3-500ZG's


  Remember, the 3K-A was designed as a commercial/government use amp.  It has no standby switch, and is built pretty stout (weighs nearly 200lbs.).  I'm about to take mine down to give it a good cleaning, add 160m to it, and add some relays so I can remotely control the fils, blower, and put it in standby when not needed.  I've seen RFP 3-500ZGs do nearly 2500W out in another Henry amp that was modified -- I'm sure it was pretty dirty at those levels, but hey, who cares during a contest, right?? 

  And like I said before, if you think 3-500s aren't good for 1kW PEP, tell Ameritron...  

  :-D

  Joe, N3JI


  k7rdx <k7rdx at earthlink.net> wrote:
    Some of the older Henry 3k amps had current limiting in the psu negative and
    required 100+ watts drive for just 1200 or so output (Easily disabled).2K
    output(Very possible) from a Henry equipped with 3-500z tubes seems a bit
    excessive to me,especially if your`e concerned about keeping neighbors and
    fellow hams happy..Jim.
    ----- Original Message ----- 
    From: 
    To: ; 
    Sent: Monday, August 08, 2005 7:58 PM
    Subject: Re: [Amps] RF Parts OEM 3-500ZG's


    >
    > In a message dated 8/8/2005 11:56:52 A.M. Eastern Standard Time,
    > n3ji at yahoo.com writes:
    >
    > Maybe you should try it with **TWO** 3-500ZGs, like my Henry runs. It
    will
    > provide nearly 4kV at 1A with Peter Dahl upgrades.
    >
    > Joe, N3JI
    >
    >
    >
    >
    > I wont comment on the first sentence, but the 4KV would probably have to
    be
    > under load. Most amps except for your Henry WONT give 4KV under load.
    Any
    > other amp except one like yours will not produce that kind of power from
    3-500s
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