Scubapro 109/156 membrane replacement options

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Tr4lover

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Question about G250 diaphragm in a BA. The g250 membrane stands taller than my original 156. Should the lever arm be adjusted out to compensate for this difference?

Question about G250 diaphragm in a BA. The g250 membrane stands taller than my original 156. Should the lever arm be adjusted out to compensate for this difference?
 

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buddhasummer

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That looks like a G250 HP diaphragm not a G250.
 
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Tr4lover

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That looks like a G250 HP diaphragm not a G250.
I happened to stumble upon this. I'm not sure of the difference between the HP diaphragm. While I am waiting for your diaphragms I figured I'd try these out.
 

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buddhasummer

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They are taller than G250 ones, no idea as to the ones you're getting as I've never ordered that part number before. I used some G250V diaphragms, which are taller as well, in some G250s and I ran into tuning issues, something wasn't right, I just assumed their height and increased surface area was to blame.

Let us know how you get on with the HP ones, the G250 ones were black, red, blue, teal and orange. The HP ones were clear.

Good luck.
 

buddhasummer

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I happened to stumble upon this. I'm not sure of the difference between the HP diaphragm. While I am waiting for your diaphragms I figured I'd try these out.
That looks like my writing in that photo?
 

Kupu

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delete. did not see previous posts.
 

p_kos

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They are taller than G250 ones, no idea as to the ones you're getting as I've never ordered that part number before. I used some G250V diaphragms, which are taller as well, in some G250s and I ran into tuning issues, something wasn't right, I just assumed their height and increased surface area was to blame.

Let us know how you get on with the HP ones, the G250 ones were black, red, blue, teal and orange. The HP ones were clear.

Good luck.
The G250 Crystal did have a clear diaphragm as well, which I’m using in a 109 currently.
 

buddhasummer

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Thanks, forgot about the crystal.
 

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