|"The rather unusual picture on our front cover this month shows the electrode assembly of a Mullard flat-type
hearing aid valve scaled against a common garden spider - magnification x7. The true scale picture is reproduced here."
"The coated filament of this tiny valve can be seen at the top of the electrode assembly. It has approximately the same thickness as the fine thread of a spiders web, whereas the uncoated filament wire is appreciably finer, being 8 microns or three-thousandths of an inch thick."
"An artical on these Mullard sub-miniature valves, and how they are making possible notable reductions in size and weight of hearing aids, will appear in our next issue."
|Technical Contents :||Replacement of Television Picture Tubes (continued)
Valve Testing Saves Time
Valve Manufacturing Techniques Pt.3 - Assembly of Miniature Valves (continued)
The Projection Television System Pt.1
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25th May 2011