7704
The Tektronix 7704 is a 150 MHz, four-bay mainframe introduced in August 1969 that can take two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins. The 7704 is one of the initial oscilloscopes introducing the 7000-Line and very lavishly built, using contacts embedded in the aluminium frame for interconnecting the gold plated circuit boards. It also features the 7000-series remote control connector on the rear panel.
It was superseded by the completely redesigned 7704A in 1973. There is also a rack-mount version, the R7704.
Key Specifications
| Fastest cal. sweep | 2 ns/Div |
|---|---|
| Bandwidth | 150 MHz (with 7A11 or 7A16) |
| Calibrator | 4 mV to 40 V in decade steps (2/20/200/400 mV into 50 Ω); 40 mA; 1 kHz |
| Outputs | Vertical Signal Out (25 mV/Div, 60 MHz), +Sawtooth, +Gate, Cal, camera power, probe power |
| Z Axis input | two: High Speed (60 Vp-p, DC−100 MHz), High Sensitivity (2 Vp-p, DC−2 MHz; 0.4 Vp-p @ 20 MHz) |
| CRT | 154-0609-00, 8 cm × 10 cm graticule, distributed vertical deflection plates, P31 phosphor standard |
| Acceleration voltage | 24 kV (+21/−2.96) |
| Power | 90−136 V or 180−272 V, 48−440 Hz, 210 W max. |
| Weight | 19.1 kg (42 lbs) |
| Size | 34.2 cm × 30.5 cm × 55.1 cm (H×W×L) |
Internals
The 7704 was the first Tek lab scope to employ a switch-mode power supply (SMPS)[1]. The SMPS, designed by Gene Andrews, uses an all-discrete resonant half-bridge topology. The CRT voltages and heating are produced in a separate switching stage running off the main SMPS DC output.
Logic, channel switching, and readout use the classic TEK 7000 series custom ICs (155-0009-00 to 155-0022-00), the vertical amplifier (also designed by Andrews) and the horizontal amplifier are completely discrete.
Links
References
- ↑ See Tekscope Vol.4 No.2, March 1972, p.5
Pictures
7704 front
7704 rear
7704 CRT and controls
R7704
Left internal
Right internal
Left side of 7704 contains power supply
Right side of 7704 contains readout circuitry
Custom ICs used in the 7704