[Heathkit] Heath Warrior as an AM amplifier

[Bry Carling]

Ah, so I need a pair of 4-1000s oe 3-1000s then Eddy !!

Thank you.

On 17 Jan 2012 at 8:45, Eddy Swynar wrote:

From:           	Eddy Swynar <deswynar at xplornet.ca>
 
> On 2012-01-17, at 8:21 AM, Rick Poole wrote:
> 
> > Yes, but 200 watts is half an S unit, or less, than what I'm
> getting 
> > now.  Doesn't seem worth the effort unless I can get close to a
> full 
> > S unit improvement.
> 
> 
> Hi Guys, 
> 
> Years ago my OT radio friends W2UJR, KA9QLF, and others, told me
> this "truism" when it comes to using an external linear amplifier to
> boost one's AM signal, specifically, the maximum carrier output that
> you can safely obtain from the amplifier is equal to ONE HALF of the
> amplifier tube's plate dissipation power...
> 
> Example: you are using a pair of 813 tubes in an amp---each tube is
> rated at 125-watts plate dissipation, for a combined total of
> 250-watts. HALF of 250-watts equals 125-watts, so you can safely
> draw that output, i.e. 125-watts, from the two as your AM linear.
> 
> Some other points to consider: doubling your power output translates
> to an increase of just 3 db., which probably is not even detectable
> to the human ear. Also, one S-unit equals, roughly, 6 db. A 10 d.
> increase in signal strength WILL be noticeable to the human ear...
> 
> There, 'nuff said! You do the math at your end, using what you might
> have at your disposal, & draw your own conclusions as to the utility
> of using an AM linear amplifier. Years ago I used my 2x813 amplifier
> to boost the 10-watt AM signal from a HB rig that I had which used a
> 2E26 in its final modulated PA stage: was it worth it...? For a 10+
> db. improvement, I think it was...Would it have been worth the
> trouble to amplify the output from a Johnson Ranger in AM...? I
> think not.
> 
> ~73~ de Eddy VE3CUI - VE3XZ
> 
> 
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