[Amps] Transformers

[R L Measures]

On Jul 15, 2006, at 8:22 AM, Gudguyham at aol.com wrote:

>
> In a message dated 7/15/2006 9:51:24 AM Eastern Daylight Time,
> n3ji at yahoo.com writes:
>
> Since  you mentioned that, why does the front of the SB-220 say  
> "2KW LINEAR
> AMPLIFIER" if it was designed as a 1kW input amp?
>
> I've often wondered  that...
>
> Joe, N3JI
>
>
>
>
> The SB-220 was rated at 2KW PEP input which is 1 KW DC input.

I don't see how.

> According to
> the tune up procedure outlined in a SB-220 operators manual, the   
> output would
> be about 600-650 watts, but most hams just gunned them all the  
> way,  maybe
> thats one reason why alot of bandswitches did not hold up.

The measured open contact breakdown potential of a SB-220's  
bandswitch is c. 5000v at sea level.  The extant +/- peak potential  
across open contacts during operation is c, 300v less that the DC  
supply potential of 2700v.

> So the  transformer
> was designed with these parameters in mind.  I don't know what  the  
> Ameritron
> Al-1500 was designed for, I would think 1500 watts output, but   
> that amp
> easily makes 2250 watts output with 100 watts of drive, AND the  
> tube  parameters
> are not exceeded at that level.  Lou
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R L MEASURES, AG6K. 805-386-3734
r at somis.org