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6550 internal resistance hit parade
6550 internal resistance hit parade
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Old 29th February 2012, 06:26 PM   #1
speakerfritz is offline speakerfritz  United States
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Join Date: Jul 2008
Default 6550 internal resistance hit parade

Short of looking up individual data sheets, does anyone have a sense for which 6550 brands have higher internal resistance and there by have more conservative initial bias requirements. It seems to me the the Russian 6550's have higher internal resistance than Asian 6550's and American tubes seem to fall in the middle but closer to Asian tubes.
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