Diaphram types in 604E

[Datubie]

I've got an excellent pair of 604Es, however I noticed that the HF diaphrams are differnt from one another. The alum dome & suspension is the same, but one has a slightly larger plastic mounting ring+solder on tabs and the smaller one has screw on terminals.

Which is the correct one for the 604E?

[Datubie]

Cool. Thanks Jeff.

[jmarkwart]

Datubie,
The slightly smaller diameter mounting ring with screw on connectors belongs to the early type of diaphragm - pre-1983. This is probably the original diaphragm/VC assembly that came with your 604E. The other type is a later direct replacement that requires different lead teminations that either push or solder on. I use push on terminations when converting.
Jeff