This is a very useful power supply and still selling a good price as Tektronix had made many good probes for use. Example P6247 and ADA400A etc. With this supply, the old probes can be used in modern oscilloscopes. I open up my set and check if there is any RIFA capacitor inside to cause trouble. Luckily there is non as the supplier use a EI transformer. The regulator ICs are just normal type LM317 and LM337 TO-220 type. I see my set was replaced one of them with lots of flux near the diodes! E-cap looks good shape and brand, no need any replacement!
- P6247 1GHz probe which is good for measuring jitter on any circuit with differential input mode.
- ADA400A is very good for very low level signal even for Biotech usage with extreme high input impedance. It has 0.1, x1, x10 & x100 times and thus 1mV / DIV will become 10uV / DIV in the scope! Also differential design and very good CMRR ratings but limited to 1Mhz bandwidth only. You know what, today Tektronix is still selling this probe!!!
Tek 1103 
Tek 1103 top view 
One regulator seems replaced before 
Tek P6247 tips to measure jitter of Hifi Sperry digi Pro clock jitter 
Tek prob P6247 
Tek ADA400A 
ADA400A prob input levels – Ch1 5V x100 times, Ch2 50mV.