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modified from a 561A. | modified from a 561A. | ||
The product did not appear in a Tek catalog. | The product did not appear in a Tek catalog. | ||
With special modified amplifier and time base (3A1S and 3B1S), | With special modified amplifier and time base ([[3A1S]] and [[3B1S]]), | ||
it achieved a higher 25 MHz system bandwidth. | it achieved a higher 25 MHz system bandwidth. | ||
These were the only plug-ins which could be used in the 561S, | These were the only plug-ins which could be used in the 561S, |