[Amps] AL-811H

[carl seyersdahl]

Is it Don or Dan?? Anyway, when it comes to the question of 811A's or 572B's
, if you have an amp such as the 811, or 811H, or any amp for that matter ,
that uses 811A tubes, if you happen to have some 572B's in your "treasures"
use them if needed, but don't buy new ones if it's a question of
replacements.!!! the 572B is a great tube , BUT, It won't buy you anything
in an amp that was built for 811A's because of the plate(anode) v.
differences. Other than that, if you have some 572B's laying around and need
to Change "all " the tubes , then of course you could use the better tubes
without any problems.!!! There are those who would disagree, but that's
normal too.!!!
   I've done it that way, BUT, its usually a one change>!!!!
   I've run 811A's at 2200 vdc, BUT , I wouldn't recommend ayone try that ,
cuz , key down, you'd burn 'em up in just a few seconds.!!!!
    just a clue from someone who's been there.!!!! You won't get anymore out
either.!!!!!
    kz5ca
----- Original Message ----- 
From: "Don Nesbitt" <nesbittdr at yahoo.com>
To: "Daniel Hileman" <n9wx at hotmail.com>; <amps at contesting.com>
Sent: Wednesday, March 30, 2005 3:49 PM
Subject: Re: [Amps] AL-811H


> The 572B's will work fine - but - without increasing
> the anode voltage you likely won't get anymore output
> - just the satisfaction of knowing that you have lots
> more plate dissipation for an extra margin of safety.
>
> The "factory" cooling in the 811H is pretty much on
> the marginal side in the first place but it does work
> OK when the amp is run according to Ameritron specs.
>
> Unless you just happen to have 4 572B's laying around,
> why bother to go to the extra expense?  Go with it as
> is and recapture the romance ;-)  It is spring!
>
> Have fun es 73 -- Don N4HH
>
> --- Daniel Hileman <n9wx at hotmail.com> wrote:
> > Hi Everyone,
> > Thanks for all the input about the MLA-2500 and the
> > 811h, I think I'm gonna
> > go with the 811H. Here's another question to which I
> > THINK I know the
> > answer. Will putting 572B tubes (and Maybe a bigger
> > cooling fan) in my 811H
> > allow for more  output (kinda like the Al-572) or
> > will it just be easier on
> > the amp? I have heard some say it will put out a KW
> > or so...but I think that
> > would require a bigger power supply, and if sooo,
> > might as well leave it
> > alone or buy an AL-572. I'm just curious.
> >
> > Thanks,
> > Daniel N9WX
> >
> >
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