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Description: | Type PX4 - 4-pin base valve, probably a rectifier diode. Glass chamber is long and cylindrical and is slightly more narrow at the top. Printed on outside of glass, 'Osram BVA Made in England Under British Patents'. Printed on opposite side, 'PX4' and on separate line '6 DH'. Large surface area anode; presence of grid not clear. Conspicuous getter inside. | License: | http://www.abdn.ac.uk/historic/Copyright_terms_conditions.shtml | Publisher: | ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments | Rights holder: | 47718 | Temporal: | 1930-1950 | Source: | University of Aberdeen | Creator: | Osram | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
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