Can I convert a 909 to a 902?

[SOOTSHE]

The answer to your question is "yes".

If your 902-8A looks exactly like your 909-8A, they are both from the same period where the 902, 908, and 909 were all built using the same motor and the only difference was the diaphragm.

The rubber bumper was installed on drivers sold alone. The drivers used inside of speaker systems did not normally have a rubber bumper and often did not have a back cap (this saved a few manufacturing dollars).

There were times when drivers were pulled from finished stock and installed in speaker systems. Of course these would be complete assemblies.

whitebroncoii,
Thanks for that....saves me having to try to find another 902. Will organise a couple of new diaphragms & I'm ready to go.

[whitebroncoii]

So the 909 did generally come with a cap then? Am just assuming so because the back cover couldn't be left off without it?

Yes, I believe they did. All finished speaker models using the 902 or 909 HF drivers were loaded with a version of the driver using only the loading cap. Examples would be; 9872-8A/M400, 9850-8A/PS-95, and the PS-360.