In article d.invalid,
Adrian Tuddenham wrote:
You're absolutely right. Got my peaks mixed up. Not a good idea in this
game. ;-)
Don't worry about the odd decimal point. Narrower than the needle width
anyway. ;-)
Have you noticed that the needles of the original PPMs were flatways-on
to the scale?
How original are you going? Back to the round right hand zero valve
designs? I've not got one of them handy. The Ernest Turner stereo ones
have IIRC a V shaped pressing - presumably for maximum rigidity and
minimum mass.
Presumably this was to reduce air loading and to give the needle more
rigidity in the plane of rotation so that it didn't bend when kicking up
sharply.
Or simply to make it more visible at a distance?
--
*I wish the buck stopped here. I could use a few.
Dave Plowman
London SW
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