Is this a 909 or 902 diaphragm

[magnarc]

Need a bit of help. Have a diaphragm marked on the base as a 34647 yet silkscreened as a 909 (i.e. a 26420).

Which would you believe, the stamp on the rim or the silkscreen?

Any other way to tell the pascalite from the all aluminium?

[bowtie427ss]

When you say "silkscreen" i assume you are talking about the maestro?

Logic tells me that the diaphragm itself has to be silkscreened before assembly.

A bit disappointing that QC got this bad.

Obviously it can't be both. So, we're left to question who's QC was the worst as i am guessing that the hydroforming of the diaphragm material was outsourced.

I think it's going to be difficult to tell for sure. But, to me it seems like final assembly is where this kind of mistake would occur. I think it'd be easier to explain mis-numbering in the final assembly than to make a mistake silkscreening the wrong type of material.

All pure guessing on my part...............

[magnarc]

Yes the Maestro logo has the 909 on it, and 93.

Trying to post pics but they refuse to upload......

I'd be inclined to agree that the wrong part number was stamped on the base. It has 34647 (p/n), then 93445 which is i'd say 1993 and a week/month, then 33480 on it as well.

[Altec Best]

Use photobucket,flickr,image shack,etc img code.. Don't use hostboards picture attachment.

Was this on eBay ?

[magnarc]

It was about 6 months ago.

[GM]

FWIW, all the [undamaged] alum. ones I've noticed Vs GPA's 26420 is the former all look like alum. with a slight golden color from a fungus proofing coating [based solely on what we use to spray, dip or brush on various types of electrical/electronic components, assemblies] that's pretty obvious from the dome's backside whereas the [2] 26420 have a slightly milky looking and decidedly mottled, coating, ie. almost cheap plastic looking. Otherwise, the only way I would know is by finding out the expensive way with high power testing.

GM