The Oktava MK18 is the less well known, but more sophisticated older brother of the ubiquitous MK219, which is used and abused by hoards of mic-modders who love to chop and swap grills, capacitors and resistors.
|Oktava MK18, front view with pattern switch
In contrast to the cardioid-only 219, the MK18 is a dual diaphragm, multipattern condenser mic, with bass roll off (HPF), a -10dB pad, and pattern selector switches.
|Oktava MK18 rear view with pad, HPF and rear capsule switch
It also has a fourth switch with large and small cardioid symbols. This controls the ‘mix’ of the rear capsule, allowing the in-between patterns to be selected, to give hypercardioid and supercardioid response. Clever!
|Oktava MK18 inside, front view showing components
The switches are actuated by sprung bits of bent metal, and they make the mic very tricky to reassemble.
|Oktava MK18 inside, rear view showing PCB traces
The mic has that typical Oktava quirky build style, with etched PCBs and a small square can output transformer that looks different in size style from the ones in the MK219 and 319. The connector is a push-fit din plug!
Unfortunately this mic is designed to run with 60V rather than 48V phantom power. It will work with a normal phantom supply, but is currently giving erratically output, and may need some small modification to make it behave itself!