Here's a nice not too ancient Tek scope. This is the Tek 465, These were sold until at least 1982, and for a princely $3995. Get this one now for much less.
DC TO 100 MHz BANDWIDTH -- Conservative, in the Tek tradition.
DUAL TRACE - Chopped or alternately displayed.
5mV/DIV - 50V/DIV VERTICAL - Enough sensitivity to test microphones, and enough range for vacuum tube circuitry too. Also with Tek's good overload protection, it can handle sunstantial overvoltage without frying the inputs.
0.05 uSEC/DIV TO .5s/DIV HORIZONTAL - Speedy enough so you can watch short glitches.
TIMES 10 SWEEP MAGNIFIER -- Even more expansion for watching extra closely.
Dual sweeps, DELAYED or EXPANDED SWEEPS- Nice ten-turn knob so you can slide along the waveform at your leisure.
TRIGGER VIEW-- Pull a knob and watch what the trigger circuit is seeing-- great for optimizing triggering levels and bandwidths.
A cornucopia of triggering and sweep options!
8.10 cm CRT-- Big enough so those of us with old eyeballs can read it from across the room.