4, 811As have the same emission as 4, 572Bs, so PS current would be the
same.
On Oct 1, 2005, at 8:41 PM, OTAKEBI@aol.com wrote:
> I do not think the power supply of the AL-811H can handle four 572's.
> This is why when you change from 811's you don't see that big of a
> power
> output jump in the AL-811H.
> The power supply is at the edge of its design.
> It can hardly four 811's.
> Now, the Al-811 can do better with the 572's because with only three
> tubes
> you have a little extra to drive those tubes from that power supply.
> In fact the AL-811 does not suffer from those sudden pops and unrest
> as does
> the AL-811H.
> Before going to the AL-811H I would recommend dropping three 572's in
> an
> AL-811.
> You will get the same output as with the AL-811H.
> I would still suggest not to push it. Keep it at about 1.7KV .
> If you want more output than 600 watts CW you need another amp.
> With any equipment, when you go over the design tolerance you are
> asking for
> trouble and funny things start to happen.
> All it takes is a reactive load and bam, kaboom, and golly gee Batman.
> MFJ went to the edge with the AL-811H and some operators are driving
> it over
> the cliff.
> Don't blame MFJ.
> Dan/N4VET
>
>
>
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>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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