Sony ECM-77
Five-point-six millimeters of capsule and a gram and a half of metal - Sony's lavalier that disappeared on the talent and turned up in broadcast inventories for decades.
Overview
The diameter is 5.6mm. Sony's own launch material for the ECM-77 leaned hard on that number, and with reason. A capsule that narrow slips under a collar, tucks into a lapel fold, or rides a headband without the subject feeling it. The second number is 1.5 grams, and the scale barely registers it. Small and light is the whole design argument. Sony pitched it at broadcasters and production sound mixers who needed a lav that vanished on camera.
Sony quoted the frequency response of the ECM-77 as 40Hz to 20kHz. That is a full-range figure for a lavalier, and it explains why the mic kept showing up in serious production work rather than only in conference rooms. Studio Sound (August 1985, p.41) covered the launch as part of a new generation of Sony lavaliers. It noted that the ECM-77 was small enough and light enough to clip into a pocket with a standard pen clip, and that despite its size it carried that 40Hz-20kHz response. The polar pattern is omni-directional, per Sony's own range documentation.
Finish options were silver and black. The ECM-77 sat at the top of a four-mic lavalier family Sony introduced together. The uni-directional ECM-66 and the omni ECM-55 and ECM-44 filled out the line, all offered in silver and black. The 77 was the flagship of that group in the sense that mattered to production: the smallest and lightest of the bunch.
The period advertising around the family made a point of flexibility. Mix (October 1985, p.83) ran the lavalier line's pitch. The mics could run on either a single AA battery or phantom power, and the accessories included pin and necklace-type clips plus a power supply holder that clips to a belt. Connector options across the range included XLR, pigtail, and Sony wireless configurations.
The ECM-77's reputation was built in the field rather than on the spec sheet. Studio Sound (March 1993) documented a Muppet production where the sound team built a headband rig with a small Sony ECM-77 lavalier pointed down from the puppeteers' foreheads. It was positioned so it wouldn't get knocked about and would hold a consistent distance from the mouth while the performers worked under the set floor in awkward positions.
Broadcast adoption followed. Studio Sound (July 1999) reported that ITN's refurbished London news facilities took a 14-channel WL-8000 wireless system along with the new WRT-805 belt transmitter and ECM-77 miniature lavalier mics, split between the Channel 4 news studio and the ITV production facility. Pro Audio Review (June 2002) covered Logan Productions' switch to Sony UHF wireless, which included twelve WRT-805B transmitters equipped with ECM-77 lavaliers.
By 2008 the ECM-77 was still being pulled out of the kit as a reference lav. Pro Audio Review (January 2008) used Sony ECM-77 and ECM-88 wired lavaliers alongside Lectrosonics and other mics while evaluating a field mixer, the kind of A/B setup where a familiar lav serves as the known quantity.
The available material leaves some gaps. Production years aren't documented, and neither is original pricing, sensitivity, self-noise, SPL handling, or the exact connector the ECM-77 shipped with as a standalone item. Buyers should verify termination and whether it's a wired or wireless-tail version before committing. The family spanned XLR, pigtail, and Sony wireless terminations, and a used example may have been reterminated over the years. The mic's own documentation is thin on maintenance specifics. The practical concerns for a lavalier of this vintage are the cable and connector, which take the abuse on any production mic.
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