No - completely different architecture.560 series plug-ins contain the crt deflection amps.1A1, and similar, are for series 530/40/50/80 instruments, in which deflection circuitry is part of the main frame.Bernd Schroder On Monday, June 17, 2024 at 03:26:00 PM PDT, mike zias / W3JRR via <mikezias=[email protected]> wrote: can the 1A1 dual pre-amp be used with a 561a scope? ?