On Fri, 8 Dec 2006 21:11:44 +0100, "Antonio Vernucci"
wrote:

I opened the meter of an Hallicrafters SX-117 to mechanically adjust the zero.
Once open, the meter appeared to be of the moving iron type, that is with no
moving coil. But I was surprised to see that that meter has no spiral torsion
springs either; I can only see a metal (?) dish mounted on the axis, part of
which lies inside a rather flat coil.

Hi Tony,

Consult paragraph 5-5:
http://www.rigpix.com/hallicrafter/sx117_manual.pdf

73's
Richard Clark, KB7QHC