[AMRadio] AM Amps

Gary Schafer garyschafer at comcast.net
Tue Jan 11 23:09:08 EST 2005

Geoff wrote:
>>> I'm not sure you can get more than around 1kW PEP output of a pair of 
>>> 813's... and probably more like 800w.  (3) in parallel would be a 
>>> different story, though.
>>> 73 = Best Regards,
>>> -Geoff/W5OMR
>> I would say you are pretty much on the mark there. I have a pair of 
>> 813's in GG also. I only run them at around 2500 volt and can get 
>> about 650 watts max out with 100 watts drive if I remember right.
>> I ran them well over 3000 volts many years ago and got quite a bit 
>> more out of them but didn't have a decent watt meter then so I don't 
>> know exactly.
>> 1000 watts out seems doable but they will be running around 1600 watts 
>> or more input. They will turn pretty red. Even on SSB at that power.
> *whew*  We agree on -something-  ;-)
> But I'm enjoying the discussion.  I may not be the most articulate 
> individual around, and I'm -far- from reminding anyone of someone whom 
> posses articulatino, but when it comes to someone saying "375w is the 
> limit to run to get 1500w pep output", I can't swallow that.  It's a 
> true statement, if you were to apply a sine-wave (at an arbitrary 
> rate... say, 1kc) to 100%, but as it's been said before, we don't -talk- 
> in sine-waves.
> 73 = Best Regards,
> -Geoff/W5OMR

But it is also true for voice modulation if you are talking about 
modulation peaks at 100% positive. Modulation is modulation.

Gary  K4FMX

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