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Radio Record, Volume I, Issue 10, 23 September 1927, Page 2

When building a set it is always advisable to wire the filament circuit first. The filament circuit can then be tested ont and any breaks in it fixed without having numerous wires to interfere with the finding of the break, By laying the filament wires first it is also possible to avoid any | parallelism between asplate or grid wire and a filament wire,