[Amps] SB-220 bias question

[Joe Subich, W4TV]

> Show me where I said that

You wrote: 

  > but the AAL-80, AL-82 et al. do not change the plate 
  > voltage on any mode.  The operator is told to adjust 
  > power output according to the mode.  

Reducing the power output without changing the plate voltage 
will result in a miss-tuned condition.  If the pi-network is 
tuned for full output and the drive reduced (power adjusted). 
If the output is retuned and the lower drive level, the plate 
load impedance will be incorrect for the design of the pi- 
network and the pi-network will need to be detuned (run at 
a higher Q).   

Either condition is a miss-tuning of the amplifier. 



> -----Original Message-----
> From: Gudguyham at aol.com [mailto:Gudguyham at aol.com] 
> Sent: Saturday, August 29, 2009 8:31 PM
> To: sub1 at rogerhalstead.com; lists at subich.com
> Cc: amps at contesting.com
> Subject: Re: [Amps] SB-220 bias question
> 
> 
> 
> 
> In a message dated 8/29/2009 3:57:01 P.M. Pacific Daylight 
> Time, sub1 at rogerhalstead.com writes: No, I didn't miss the 
> point.  Running an amplifier in 
> > a mis-tuned condition (tune for 1500 W Output and drive
> > to 800 W Out) If you 
> Show me where I said that
> 
>  
>