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7 valve. This measures 121 x 36mm plus pins.

schematic

From the specifications sheet (see also below), the connections are as follows:

1, 2 Heater
3 Modulator
4 Cathode and Anode 1
5 Screen
6 Top plate
7 Anode 2
8 Top signal plate
9 Bottom plate
10 Accelerating electrode
11 Bottom signal plate
I, II Collector 1 and 2
III Antidynatron

 

 .Russian valve
base 1 base 2
Base views. The internal markings on the 'top' base are the numbers 0856 stamped on a small metal plate. This number is also present in the specifications sheet that came with the device.

The specifications sheet is online: Cover, page1, page2, page3, page4 (150k max per page)

Device parameter and unit of measurement Normal value Measured
1. Collector 1 current when function is at maximum, uA, min 60 77.0
2. Collector 2 current when function is at maximum, uA, min 60 69.3
3. Modulator current, uA, max 1.0 0
4. Antidynatron electrode current, uA, max 1.0 0
5. Top plates current, uA, max 3.5 1.0
6. Bottom plates current, uA, max 1.0 0

 

Recommended working conditions and units of measurement Values
Normal In fact
1. Filament voltage, V 6.3 6.3
2. Modulator voltage at working cathode current, negative (at absolute value), V* 4 - 30 13.7
3. Cathode and antidynatron electrode voltage, negative (at absolute value), V 220 220
4. Accelerator voltage, V 250 250
5. Functional electrode voltage, V 50 50
6. Anode 2 voltage, V 0 0
7. Collectors 1 and 2 voltage, V 0 0
8. Initial bias at top plates, negative (at abs. val.), V* 5 - 25 16.4
9. Initial bias at bottom plates, negative (at abs. val.), V* 5 - 25 12.2
10. Deflection voltage at top plates, negative 35 35 (by absolute value), V 35 35
11. Deflection voltage at bottom plates, negative 25...35 29.4 (by absolute value), V 25 - 35 29.4
12. Cathode current, uA 200 200

Notes:
* Voltage to be adjusted within specified limits when device is tuned
1. Voltages at all electrodes except modulator are specified relative to anode
2. Modulator voltage is specified relative to cathode.

Absolute maximum ratings and units of measurement Nominal
Not less than Not greater than
1. Filament voltage 5.7 6.9
2. Cathode voltage, negative (by absolute value), V 210 230
3. Accelerator voltage, V 240 260
4. Functional screen voltage, V 45 55
5. Collectors 1 and 2 voltage, V -50 +50
6. Cathode current, uA 170 220

Note: Voltages at all electrodes are specified relative to anode 2.

General data
Minimum lifetime 2000 hours
Focusing and deflection of electron beam: electrostatic
Delay before device is ready (after power-up), 45 secs
Outer dimensions, mm maximum length 147 maximum diameter 37
Mass, g, not greater than 250
Device orientation: any

Thanks to Alex Kouznetsov for translating the original material and to John Kaesehagen for arranging this.

This file was last modified 23:20:00, Saturday June 07, 2008