465 − from the estate of a hobbyist
502 − spent many years in a university lab attached to strain gages watching metal samples being broken, at the end reduced to be a DSO pre-amp
545A − from a guy with a remarkable collection of early radios and phonographs
585 − another university retiree
2230 − this one had been working on the railroad ...
7503 − worked in a plasma physics lab, then moved to the physics dept at a smaller university
7613 − my first 7k Tek
7633 − supposedly from a private museum
7844 − my #1 go-to scope
7854 − in great shape
7904 (2) - worked for some time, PSU to be repaired
7104 − tube worn but in decent shape overall
Carts, Cameras etc.
- 202-1 scope cart.jpg
1103 Probe power supply, front panel
Faster-than-light beam on 7104? Using a 067-0587-02 calibration fixture at maximum amplitude produces this trace spanning 1.2 Div horizontally at 200 ps/Div and 8 Div vertically. Trace length is (1.2² + 8²)½ × 8.5 mm = 68.8 mm, travelled in 1.2 × 200 ps = 240 ps. Apparent speed is therefore 68.8×10-3 / 240×10-12 m/s or 2.86×108 m/s. Very near miss ...
7104 rise time measurement as before, 1000 Hz repetition rate at same brightness settings.
7104 recording 1 GHz sine, single shot at 500 ps/Div. Camera: Nikon D7000, 50 mm f/1.4, ISO 3200, 1/2 s. CRT filter not removed. CRT amplification loss is evident around the center line.
BC337 on 7CT1N
P6230 Rise time without ground lead: 9.2 * 20 ps = 184 ps (equiv. to 1.9 GHz bandwidth)
P6230 Rise time - Effect of using the "low inductance" ground lead - rise time 400 ps, bandwidth 875 MHz
P6230 Rise time - Using the 250 mm alligator ground lead - severe pulse distortion, rise time ~3 ns (115 MHz)!
Tektronix 067-0587-02, gain mode, in horizontal slot
Tektronix 067-0587-02, gain mode, in vertical slot
7B85 used for pulse width measurement
7S12 as a sampler displaying a 1 GHz signal (normal mode / non-storage)
7S12 displaying the incident pulse from an S-52 (nom. < 25 ps) through an S-6 head (nom. < 30 ps)
sub-millivolt triangle signal displayed through 7A22, BW=1 kHz
sub-millivolt triangle signal displayed through 7A22, BW=10 kHz
sub-millivolt triangle signal displayed through 7A22, BW=100 kHz
sub-millivolt triangle signal through 7A22, BW=1 MHz
Tunnel diode quick check example using the method from Service Scope 49. Right beam is zoomed with delayed timebase to show step speed.
308 display, timing mode (binary counter example)