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1. Tube🌞Time (tubetime@mastodon.social)'s status on Wednesday, 28-Aug-2024 01:56:14 JST Tube🌞Time

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   the ST-225 drive uses a similar circuit but it is an older design and less integrated. the ST-251's SSI257.2 chip drives the center taps of the head windings. they just "garbage collected" the transistors, head select decoder, and resistors driving it along with the transistors that set the write current.