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ID = 19003
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode-Heptode   Frequency converter 
Identical to CV2128 = ECH81
Similar Tubes
Normally replaceable-slightly different:

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC

The CV specification for the CV2128 whose prototype is the Mullard/Philips ECH81 calls for 100% electrical testing at both high and low voltages. 250/100 volts for the heptode and 100 volts for the triode are the normal operating voltages for an ECH81.
However the requirement for testing at 15 volts for both sections indicates that such operation was envisaged prior to May 1953 when the second edition of the specification was issued.
Operation at these voltages is the requirement of the ECH83 rather than the ECH81 and tests have found that there is no difference between these two tubes and hence there was no CV specification required for the ECH83.(RJ)

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Information source -- Original-techn. papers.   

cv2128_so.png CV2128: rtt
Anonymous 10 Collector

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Just Qvigstad
CV2128: Manufacturer's Data
Roy Johnson

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Usage in Models 1= 1953 ; 1= 1955?? ; 1= 1960?? ; 2= 1962

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):5

Collection of

Collection of a member from FIN


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