[AMRadio] GG 813 Linear in GE Ham News


tim smith ve6pg at yahoo.com
Fri Sep 30 23:27:39 EDT 2005


..ok don,then what if went with 4 572b's instead? they
have a higher pd i believe..tim..sk..

--- Jim candela <jcandela at prodigy.net> wrote:

> Don,
> 
>     So your saying that 4 X 811's at maximum ratings
> in AM Linear mode are
> nearly equivalent to 3 6146's class C plate
> modulated, i.e. a Johnson
> Valiant? :-)
> Years ago I bought a book from an ad in the old AM
> Press Exchange about AM,
> and there was a detailed explanation of class C
> plate modulated versus AM
> linear operation with the same tubes, and it clearly
> showed the differences.
> I need to go find that book again...
> 
> Jim
> 
> 
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net]On Behalf Of
> Donald Chester
> Sent: Friday, September 30, 2005 1:58 PM
> To: amradio at mailman.qth.net
> Subject: Re: [AMRadio] GG 813 Linear in GE Ham News
> 
> 
> 
> 
> >.hey don,what are your thoughts of am transmission
> >with 4 811s?..i'm looking to get more output on 160
> >am..
> 
> In linear service, the maximum carrier output would
> be half the plate
> dissipation.  The pd of the 811A is 65 watts.  So
> for a quad, the maxumum
> safe carrier output would be 130 watts.
> 
> In grounded grid service, some of drive power will
> feed through, so you
> might add 10% to that, bringing the carrier output
> power to 143 watts give
> or take a few.
> 
> With the pair of 813's you would add some
> feedthrough power to the 125
> watts.  I would say more like 12.5 watts, to bring
> the total to 137.5 watts.
> 
> Most g-g linears take about 10% of the output power
> to drive them.
> 
> Don K4KYV
> 
> 
>
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