Я4С-90

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The Я4С-90 is a dual-trace vertical amplifier plug-in for Soviet 7000-series clones. It is roughly analogous to the Tek 7A18.

Vilnius Research Я4С-90
Dual-trace vertical amplifier Я4С-90 front panel Compatible with Soviet 7000-series clones Produced from (?) to (?) Manuals Я4С-90 amplifier manual Я4С-90 Technical description and instruction manual (in German) Я4С-90 Calibration certificate (in German) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

Significant differences to the 7A18 include:

has a bandwidth limiting switch like the 7A26

The input connectors are СР50-73 type.

The example in the photos is labelled in German. A version labelled in Russian also exists.

Key Specifications

V/div	5mV/div to 5V/div in 1-2-5 sequence
Vertical modes	I, chop, add, alt, II

Links

Comparison of Tektronix 7A18 and Soviet Я4C-90

Pictures

Front
Three-quarter view
Rear
Я4С-90 and 7A26 Front
Я4С-90 and 7A26 Rear
Я4С-90 and 7A26 Threequarter
Seal on rear of plugin locking side panel
Vertical amplifier plug-in

Comparison 7A18 vs Я4С-90 attenuators

Attenuator top part with shielding
Attenuator drum assembly
Bottom view with removed outer shieldings
Bottom view with removed shielding over 1:100 attenuator
Bottom view with removed attenuators
Comparison between Tektronix 7A18 and Я4С-90 attenuator assembly
Comparison between Tektronix 7A18 and Я4С-90 attenuator module (1:10)
Side by side comparison of a Tektronix and a Я4С-90 attenuator
Tektronix attenuator module mounted in a Я4С-90 attenuator assembly

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