Telequipment S51
The Telequipment S51 is a low-cost single-channel 3 MHz scope originally intended for the service and education markets.
There was an S51E model variant for education that eliminated the external trigger input in favour of a sweep (sawtooth) output, and an S51T variant with an additional (selectable) horizontal preamplifier (100 mV/cm at 10 kHz bandwidth).
It contains 7 tubes except the CRT (one ECF80, six ECC88) and one transistor.
The S51 is convection cooled.
Key Specifications
| Bandwidth | DC to 3 MHz (−3 dB), AC cutoff |
|---|---|
| Deflection | 100 mV/cm to 50 V/cm, 1−2−5 |
| Input impedance | 1 MΩ // 30 pF (banana connector) |
| Sweep | 100 ms/cm to 1 μs/cm, 1−10 and 10:1 variable (slowest 1 s/cm) |
| CRT | 5" Brimar Se5F, P1 phosphor initially / P31 on later models; 3 kV acceleration |
| X input | 1-2 V/cm, 5 Hz − 200 kHz; 500 kΩ // 100 pF; (S51T: Optional 100 mV/cm, 10 kHz mode) |
| Features | Auto trigger, TV trigger, Z input |
Links
- Fixing a Telequipment S51B @ YouTube
- Telequipment S51B @ radiomuseum.org
Pictures
S51B
S51E
