Soviet 7000-series clones

The family of Soviet clones of Tektronix 7000-series scopes included models S1-91, S1-115, S1-122 and S8-21 (Cyrillic: С1-91 etc.). They used the same plug-in modules, of which 14 types were available.

The base model S1-91 was introduced in 1977 and had 100 MHz bandwidth. It was "heavily inspired" by the Tektronix 7603. (Compare also the Hungarian TR-4658.) Unlike the 7603, the S1-91 only has a 1 cm graticule size.

These scopes were designed at Vilnius Research and Development Institute of Radio Measuring Instruments (Lithuania).

However, they are not directly compatible with Tektronix plugins since mechanical parts and connectors use metric sizes.

Specifications

S1-122 (С1-122) mainframe	A4S-90 (Я4С-90) amplifier plug-in	A4S-91 (Я4С-91) time base plug-in
3 plug-in bays 100 MHz bandwidth 100 mm x 120 mm usable screen area 17.5 kV accelerating voltage Readout system Power: 220 +/- 22 V, 150 W Weight: 17 kg (37.5 lb)	2 channels bandwidth DC to 100 MHz rise time 3.5 ns deflection factor 5 mV/div to 5 V/div.	trigger up to 100 MHz (min. 0.8 div internal or 0.4 V external) sweep A: 5 ns/div. to 50 ms/div. sweep B: 20 ns/div. to 5 ms/div

Mainframes

• С1-91 100 MHz
• С1-115 50 MHz dual beam
• С1-122 100 MHz
• С8-21 100 MHz storage

Plugins

• Я4С-89 Pulse Generator, with three 50-ps rise time pulse heads
• Я4С-90 Amplifier (like Tek 7A18)
• Я4С-91 Timebase (like Tek 7B53A)
• Я4С-92 Curve Tracer (1979)
• Я4С-95 Sampling Timebase, 20 ps/div, up to 5 GHz trigger
• Я4С-96 Dual Channel Sampling Unit, 12 GHz (1981)
• Я4С-97 Digital Multimeter (like Tek 7D13)
• Я4С-98 Digital Delay (1998)
• Я4С-100 Dual Channel Sampler (similar to Tek 7S11), 18 GHz (1983)
• Я4С-101 Sampling Timebase (like Tek 7T11), 10 ps/div, up to 10 GHz trigger
• Я4С-102 Dual-channel Delay Line (like Tek 7M11), 70-ns delay, 2.3 GHz bandwidth
• Я4С-105 Cursor measurement unit (roughly related to Tek 7D12) (1981)
• Я4С-110 Logic analyzer (3 units wide, like Tek 7D01/DF1) (1984)
• Я4С-122 Digital storage scope (3 units wide, like Tek 7D20) (1986)
• 2К11 calibration unit

Links

• S1-91 @ radiomuseum.org
• eltesta.com history
• History of Oscilloscope Development in Vilnius
• YouTube videos: Testing Я4С-90 and Я4С-91 plugins in С1-122 oscilloscope / S1-91 Clip 1 / S1-91 Clip 2 / S1-65 / S1-55
• Articles by Martin Jones: Soviet Tektronix 7000-series oscilloscope copies / Tektronix 7A18 vs. Soviet Я4C-90
• Replacing dead 04KN009 (04КН009) parts
• Teardown of Russian S1-91 / Picture Album

Pictures

• 

  S1-115 and plugin family

• 

  S1-91/4 18 GHz sampler (1981)

• 

  С1-122 and 7603 side by side

• 

  С1-122 and 7603 side by side

• 

  С1-122 and 7603 side by side