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Indeed, in those scopes, the plug-in is directly driving tube grids in the mainframe. | Indeed, in those scopes, the plug-in is directly driving tube grids in the mainframe. | ||
In 580-series scopes, the plug-in expects the mainframe to have a controlled impedance of 93 Ω per side (differential signal). | In 580-series scopes, the plug-in expects the mainframe to have a controlled impedance of 93 Ω per side (differential signal). | ||
The pin-out of the interface connector is also different, | The [[580 Series plug-in interface|pin-out of the interface connector]] is also different, | ||
the 580-series pin-out being essentially flipped 180° from its | the 580-series pin-out being essentially flipped 180° from its | ||
530/540/550 series counterparts (''Signal Out'' is between pins 14 and 16 as opposed to between pins 1 and 3, etc.) | 530/540/550 series counterparts (''Signal Out'' is between pins 14 and 16 as opposed to between pins 1 and 3, etc.) | ||