[Amps] Proper tuning / was SB-220 bias question

[donroden at hiwaay.net]

Just do like everybody else and holler "Helllllllloooooooooooooooooooo"
While tuning for max smoke.   Its almost as good as a "CQ DX ONLY"  . . . .  .

Don WA4NPL


Quoting "jeff millar" <jeff at wa1hco.net>:

> Joe Subich, W4TV wrote:
>> If you don't retune the output network when operating in a
>> continuous power mode (CW or RTTY) at a lower power level,
>> the loading will be incorrect.  Linearity may or may not
>> suffer, efficiency will certainly suffer, and since the
>> loading is incorrect it will be difficult without doing
>> the math or taking measurements in an intentionally miss-
>> tuned amplifier what the voltages/currents in the tank
>> are.
>>
>> One thing is certain, improper loading has caused more
>> damage to amplifiers than any other cause.  Intentionally
>> mistuning an amplifier is, to quote the President, "stupid."
>>
> If that line of reasoning were true, then we would be required to never
> talk softly when transmitting. It seems obvious that once tuned for 1500
> watts, any output less than that will result in lower currents and
> voltage swings. Yes the plate voltage soars a bit, but it does than when
> talking softly as well.
>
> If you really want to chew on something, think about tuning to 1500 CW
> with sagged plate voltage and hit the amplifier with the first voice
> peak when the plate supply is still fully charged...probably goes to
> more than 1500W...and it's not properly tuned for that condition.
>
> It amazing that anything works at all.
>
> jeff, wa1hco
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