On Wednesday, August 22, 2001 1:29 AM, Huw Porter wrote:

(snip)
> Buzzing certainly wasn't a problem with Strike's own Command Air, as
kindly
> lent to me to try a dive in a long hose/backplate/wing combo, so I suspect
> it's just necessary to have the reg carefully adjusted. :-)

'carefully' is a relative term!  :-)

Bear in mind that *any* regulator should be designed with its use at depth
in mind!  I've used G-250's that "blurt and fart" on the surface but that
function perfectly at depth; similarly with Apeks regs.  If they were mine,
then I'd break them down and re-assemble so that I *know* that there's
nothing untoward in them.  ie.  regulators straight out of the box can - and
do - occassionally have foreign matter in the system. (Filings, dust, etc.)
If left unattended these can - and do - cause problems.  (It's one of the
reasons that I always have my regs O2 cleaned regularly - even ones that
I've owned and used for years - or on delivery!)  :-)

Apart from being a safeguard against something that's never going to
happen - if you believe people who suggest that high concentration's of O2
are OK up to 40%, but that beyond that they're dangerous??? - it's a good
opportunity to make sure that the thing's been assembled properly, and that
in the event of a malfunction, you know who to blame!  :-)

Strike