Converting a D-87 to ORS87

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joulupukki

Well-known member
Joined
Dec 29, 2023
Messages
266
Location
Utah
I've got a D-87 (Dany Bouchard) that I've built into an Aurycle A460 mic body. I originally had it built using an Arienne Audio K87 capsule but I've since swapped it out for a JLI TSC-2 capsule (because I used the Arienne for my Fuchs U87a). With both cases I've been underwhelmed by the lack of sensitivity of the D-87 and would like to change it if possible so it's closer to what the Fuchs U87a would be (and my other condenser mics).

As is, the -10dB pad and low cut filter switches are functional.

I'm currently using a 33V Zener with a 47K at R17.

It's been suggested that the ORS87 would yield better sensitivity so I wouldn't have to turn up my preamp so high. I'm starting this thread so I don't pollute the D87 build thread anymore. Has anyone else done this conversion with satisfying results? As pointed out by @micolas I think it's just going to be a matter of tracing both circuits and removing what no longer belongs on my existing circuit board. Right?
 
You've been warned you'd be giving up the omni & fig-8 patterns, right?
:)

When I switched from the AA K87 to the JLI TSC-2 I already gave up one of those. I've never used omni or fig-8 with this mic anyway. I've got a modded AKG P420 and the Fuchs U87a for that purpose if needed.

These are the U87 schematics I've been referencing with the D-87 build:

http://recordinghacks.com/images/mic_extras/neumann/U87-schematic-1972.png
http://recordinghacks.com/images/mic_extras/neumann/U87-schematic.png
 
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