[Amps] SB-220 Drive Levels

[Robert Morris]

Jeff Carter wrote:
> Can anyone tell me how much drive the SB-220 needs to make 1.5KW?
> 
> I've seen several references that 100W isn't enough drive for this
> amp.  How much would it take?
> 
> Jeff/KD4RBG
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> 
The SB220 was never designed to "make" 1500 watts. It was designed for 1000 
watts INPUT (plate volts x plate current). At 60% efficiency, look for 600 out.

Just because it has 3-500's, the tank coil and power supply were never meant for 
more than 600 out.

Because of the usual low plate voltage(2200-2400) trying to drive harder will 
cause extra high grid current and blow the tubes.


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