[TenTec] Centurion and AM

[Bob McGraw - K4TAX]

Tune for maximum output with about 100 watts of carrier from the TS-590.  CW 
mode, key down should do this.   Be sure and keep the grid current and plate 
current at or below maximum rated values at all times.   This should produce 
about 1100 to 1300 watts output.  When you switch to AM, the carrier should 
automatically drop to about 25 watts.  This should produce about 250 watts 
carrier output.  If the output is a bit higher, I would reduce drive a bit 
more to say 20 watts.  Do not change any tuning values on the amp after the 
initial tuning at 100 watts and maximum output.

Remember that 25 watts of carrier modulated 100% is 100 watts PEP. 
Therefore, 250 watts of carrier modulated 100% is 1000 watts PEP.  Although 
the Centurion is rated at 1200 watts PEP, the lesser value is more correct 
in as much as compression begins to take place somewhere between 1100 and 
1300 watts output.  Thus 250 watts carrier for AM is a much safer value and 
assures proper linearity.  Plus with a grounded grid linear amp, the drive 
power is in phase with the output so the total output contains the value 
derived by the amp gain plus the driving power.

73
Bob, K4TAX




----- Original Message ----- 
From: "Timothy Johnston" <timothy.f.johnston at gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Friday, August 01, 2014 7:59 PM
Subject: Re: [TenTec] Centurion and AM


>I would be feeding it with 25w of AM from a TS-590. So.. exactly what would
> the safe procedure be?
>
> 73 de Tj, K4TFJ ...
>
>
> On Fri, Aug 1, 2014 at 8:46 PM, Barry N1EU <barry.n1eu at gmail.com> wrote:
>
>> On Sat, Aug 2, 2014 at 12:28 AM, george fritkin via TenTec <
>> tentec at contesting.com> wrote:
>>
>> > 200 to 250 watts AM results in 800 to 1000 watts PEP at 100% 
>> > modulation.
>> > Three 811 tubes can not handle that power.
>> >
>>
>> How about two 3-500Z's?
>>
>> 73, Barry N1EU
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