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I have found that the model-specific and chassis-specific service literature is invaluable with vintage TV and audio gear.
Instead of spending a great deal of time troubleshooting by taking voltages or injecting signals or tracing circuitry, you can really pinpoint a problem in a short amount of time regardless of skill level. Things such as I.F. alignment are virtually impossible without the SAMS or equivalent. Same goes for setting convergence/purity although this of course can be 'winged' so long as you've got the proper test gear.
Most of all, I'd say that my external degauss coils, and marker/generator are my most used test equipment. Besides simple tools such as multimeter, HV probe, hand tools etc.
You know what is really nice to have? a variable voltage supply capable of supplying many amps of current. I built one into my test bench area and have used it a lot.
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