Lou,
What's funny in the manual, if I recall, Heathkit says the SB-220 can take 100
watts drive. I'm pretty
sure I read that in there. In which case, the amp would produce what 2 3-500Z's
are really capable of. It's like
in part of the manual they want to hold it back to the 1000 watts DC input, but
say run it on up, it'll
take it.
Best,
Will
*********** REPLY SEPARATOR ***********
On 7/15/06 at 11:22 AM Gudguyham@aol.com wrote:
>In a message dated 7/15/2006 9:51:24 AM Eastern Daylight Time,
>n3ji@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. 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. 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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