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ID = 40222
Tube type:  Numerals- and Symbols indicating tube 
Identical to HB105
Successor Tubes Z550M  

Base SPECIAL TUBEBASE in general
Description Very early Pixie indicator by Haydu Brothers. The prefix itself, H-B, looks to be the acronym of Haydu Brothers. Designed as low cost indicator with single etched anode plate and pins terminating in short cathode rods on its back side.
See also H-B106. 
HB105: Patrice ZEISSLOFF
Patrice Zeissloff


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