soundhaspriority wrote:

One other thing that peeves me about electrets is the sensitivity to high
temperature. A-T warns not to expose to temperatures over 110F. This is all
too easily reached by accident during travel. While many people have boasted
that their good German mikes are still good after many years, the electret
inevitably depolarizes sooner or later.

Loss rate on the SM-81s in Shure storage has been around 0.5 dB every
thirty years. You can live with that.

Most of the mikes that had high leakage rates (and the early Sony ECM
series mikes are notorious) had cheap electret materials that were known
to be leaky but were used anyway to reduce cost.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."