Matej,

Check your intermediate pressure, should be
around 140 PSI and steady except on demand where
it will show a drop. 

If you notice a gradual creep upwards while not
on demand, you have a faulty HP seal/seat.  In
this case, the second stage will bleed off the
excess IP.  

In the first instance, lower the IP just a bit.
In the latter instance, you will need to have new
HP seals/seats installed which should be covered
by warranty.
  
Most likely, it is the first scenario, high IP. 
Someone just miss tuned them on assembly.  The
shop should have checked them before delivery!

However, at this level of diving, one should
already know how to determine the above and
correct it with all due respect.  Not a flame,
just some food for thought.

Sincerely,

William

--- Matej Simonic / Testing LTD <mail@te*.si*>
wrote:
> Does anybody know what is the problem with Apex
> Tx40 (50) 1st stages (membrane). Between our
> friends we have 5 Tx40 regs. They seem to have
> some sort of problem with 1st stages. They leak
> slowly (we swapped the 2nd stages and it did
> not help) so that you have continuous small
> stream of bubbles coming out of the second
> stage. That happened in 2 cases. 
> We decided for Apex based on the list
> recommendations and we took membrane dry 1st
> stages because we frequently dive in cold
> waters. Both leaking regs are well maintained
> and almost new (in fact one came leaking new)
> and the other has less than 20 dives. The rest
> of us are now very worried. (because we thought
> we bought good regs...)
> 1) Is this common for TX40 (TX50 has the same
> 1st stage) and what shall I do. 
> 2) What is the cause of this/how to solve it.
> 
> Best Regards
> Matej Simonic
> 

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