On Fri, 05 Oct 2018 13:47:58 +0100, Chris Cannam
wrote:
A full-size jack is 6.3mm, not 6.5mm. So the image
is of everyone
turning up and then spending their time trying to jam oversized jacks
into undersized sockets. An excellent joke, I thought, if wilfully
obscure.
Unfortunately my aged caliper gauge is damaged and not good for
measuring inner diameter. However, it's good to measure outside
diameters. At least one of my Neutrik jacks has got a measured outside
diameter of 6.35 mm, while one of my elCheapo's has got an outside
diameter of 6.3 mm and there's still much clearance, if I connect
the 6.35 mm Neutrik to different sockets. I can't say for sure, but the
inner diameter of a socket might even reach be around 6.9 mm, which
would likely be enough space to join with a 6.5 mm jack. OTOH data
sheets from at least two vendors mention an inner diameter of 6.4 mm,
for the sockets, too small for 6.5 mm jacks. Anyway, I own a lot of
cables with 6.3 mm jacks, that can't be used with a lot of 6.3 mm
sockets or they at least don't ensure a safe connection, especially not
for "mobile" instruments, such as guitars ;).