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Small output pentode, commercial equivalent is 6AM5. 6.3 V indirectly heated cathode.
Manufactured by Mullard Radio Valve Co., Mitcham, England
Cylindrical glass bulb with exhaust tip on top with miniature seven pin base.
On bulb: " HD / CV136 / KB/D ", " 1241 / C2 "
53 mm (Height), 18 mm (Outside Diameter)