CRT 154-0531-00 ---- T5611-31-1 (561B- not the same as the 561A)
The Type R561B Oscilloscope is compatible with Tektronix 2-Series and 3-Series plug-in units (with some exceptions); thus, it can be used in a variety of applications including differential, multi-trace, wide-band, delayed sweep, sampling and spectrum analysis.
Programmable plug-in Types 3S6 and 3T6 are not compatible with the Type R561B. However, the capability of these plug-ins is available (without programmability) with Types 3S5 and 3T5. The Type 3B5 can only be used in the righ-hand (horizontal) compartment.
Phosphor - P31
Graticule Area - 8 x 10 cm
Accelerating voltage - 3.5 kv.
Useable viewing ares - 8 divisions vertical by 10 divisions horizontal.
Line voltage requirements - 90 to 110 volts, 104 to 126 volts, 112 to 136 volts, 180 to 220 volts, 208 to 252 volts, 224 to 272 volts, rms, 48 to 66 Hz, single-phase ac, 186 W, 2.02 A.
excerpts from R561 Manual