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STV150/200

Sensibly equivalent to:
CV3709
    
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The STV 150/200 is a multi section voltage stabiliser. The diagram in Radiomuseum shows the three main connections connected across the mains with a current limiter in series. The centre electrode is grounded and so forming both a positive and negative rail. No specific ratings have been found but looking at other STV devices the gap voltage is between 133 and 147 Volts per gap and the maximum tube current is 200 mA. Striking occurs above 190 Volts.
The Wehrmacht was the unified armed forces of Nazi Germany from 1935 to 1945 and STV were a Berlin company. From about 1940 their products were branded Telefunken. The BAL code denotes the place where the valve was tested and accepted. BAL codes suggest Luftwaffe and RLM Eigentum translates as property of the Air Ministry.
Our other STV150/200 has a clear glass envelope.
The frosted glass obscures the inside and no additional identification is present. However, the top of the inner cylinder is held tight to the glass by what appears to be a circular spring.
The base: pin 5 is marked as 0, pin 2 as -C, the other pins are marked B1, B2 and B3 - not quite a guide to the actual connections.
The wide glass tube envelope is 65 mm in diameter, and excluding the B5 base pins is 262 mm tall.
References: Datasheet & 3002.

 

Pin Connections
B5
1
2
3
4
5
a1
a2
k
-
-

 

Absolute Maximum Operating Conditions
Stabiliser
Vh
Ah
Va
-
-
133-147
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 31, 2017.
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