Re: [Amps] Dx pedition amp ???

[R.Measures <r@somis.org>]

On Dec 1, 2004, at 8:56 PM, Joe Subich, K4IK wrote:

> N8DE writes:
>
> > IF you can find one, the Dentron MLA-1200 fits your needs
> > quite nicely at 800 w CW output using a single 8875 tube
> > and a separate power supply with total weight of about 45
> > pounds [most of the weight is in the PS].
>
> At 800 Watts CW output, you are seriously abusing that tube.

Amen since the CW max rating is 350mA - or roughly 450w output.

> The 8875 is rated for 300 watts plate dissipation, 800 W CW
> even in class C would be almost 400 watts of dissipation.
> Considering that the 8875 is difficult to find, and very
> expensive if available, I would not push it nearly that hard.
>
> The MLA-1200 does not include any kind of grid trip circuit
> to protect against over drive ... a real problem with a grid
> rated for 5 watts!  Further, the amplifier lacks a tuned
> input which could represent additional problems for many
> current transceivers.
>
> Further, the MLA-1200 does not include 160 meters - a serious
> shortfall for a Dxpedition amplifier.
>
> 73,
>
>    ... Joe, K4IK
>
>
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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