You are thinking of the SB-200 and not the SB-220. The SB-200 (pair of 572B
tubes) was rated at 1200 watts PEP input and they generally get about 600 to
650 watts output. The SB-220 (pair of 3-500Z tubes) was designed for 2000
watts PEP input and about 1000 watts output. It generally takes at least 100
watts drive, and often a little bit more, to get 1000 watts output. Getting
1000 watts output is definitely easier when running the SB-220 from 240 VAC and
not 120 VAC. Now you are not going to get 1500 watts out of a "stock" SB-220.
But, 1000 watts is doable and will not overload the pi-network, etc.
Glen, K9STH
Website: http://k9sth.com
--- On Thu, 1/22/09, Robert Morris <robrk@nidhog.net> wrote:
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.
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