I also did a silly academic exercise in which I measured the capacitance of the stock wire and compared it to the same length of Mogami wire. I cut apart a short hunk (maybe 5cm) of Mogami quad microphone cable and used some wire from that to replace the stock wire. I decided to change it for known high quality wire. The stock wiring is super thin - maybe 32 gauge - and seems cheap. One daring - you might say crazy - change I made that was not suggested was changing the wiring that runs from the capsule to the circuit board. After seeing 7 years of growth at OktavaMod / MJE.
Oktava mk 219 condenser microphone mod#
The emergence of DIY mic mod solutions and better quality, lower cost new mics from China continuously chipped away at my top line revenue and bottom line profits. I have never read anything good about the tone of tantalum capacitors, so I decided to just go with high-quality Nichicon and Elna aluminum electrolytics as I did with my Altec mixer and preamp rebuilds. In late 2013 the demand for OktavaMod / Michael Joly Engineering mic modification services and new mod’d mics began to decline. The Dorsey article calls for changing the original aluminum electrolytics to tantalum caps (which are also a type of electrolytic capacitor). I put an Elna Silmic II 4.7uF/50v cap here. The most important change to the electrolytics is changing the output cap, C5, from 1uF to 4.7uF - and using a better quality cap. You can also see two other silver mica caps, as well as the electrolytics. My Fluke DMM doesn't even read to that value. You read that right - one gigohms! The only place that stocked that value that I found was Digi-Key, and they cost $3.20 a pop. That was changed along with changing R1 and R2 to 1G resistors. You can see the input cap near the top - that was upped in value from 680pf to a 820pf silver mica cap. Here's the PCB after changing out the selected components.
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