Superlux S502 MK2 test, teardown and improvements

[MicUlli]

They look indeed quite similar, including the capsule to head amp interface.

What raised my eyebrows was how the mic was used with the capsule at one end of a boom stand and head amp at the other end. I'd expect he long wiring in between to add a lot of capacitive load, causing significant signal attenuation. Not to mention potential microphonics from vibrating cables in the boom, e.g. due to stage rumble or handling. Or would the capsules be electret types with built-in JFET? Has anyone seen such a set up before?

Jan

That is not correct. At least Schoeps devices include a JFET buffer in the capsule holder. Long wires are therefore no problem...

 

[MicUlli]

Hi All,
some questions arised regarding the output voltage and SNR with my "repair kit" in comparison to the original circuit.

S502 1st version:
Free Field Sensivity -40,3 dBV instead of -36 dBV
Electronics noise -127 dBV(A) instead of -114 dBV(A)
Self noise 16 dB(A) instead of 18 dB(A)
Max. SPL 140 dB instead of 134 dB

S502 MKII:
Free Field Sensivity -37 dBV instead of -38,6 dBV
Electronics noise -127 dBV(A) instead of -120 dBV(A)
Self noise 14,5 dB(A) instead of 16,5 dB(A)
Max. SPL 137 dB instead of 134 dB

So long MicUlli

 

[jp8]

That is not correct. At least Schoeps devices include a JFET buffer in the capsule holder. Long wires are therefore no problem...

Sorry, but now I'm confused... In your first post, you said the Schoeps and S502 MK2 capsules are interchangeable. And the capsules of the latter are without JFET and not pre-polarized, so then both should be regular condenser capsules. So do you mean to say some Schoeps capsules have a JFET or all?

Jan

 

[ubxf]

I think we might me talking about the active cable
https://schoeps.de/en/products/accessories/accessories-colette/kc.html

 

[MediaWorksOKC]

Hi All,
time to answer some questions:
1. I only sell the repair kits inside Europe.
2. The "repair kits" include pcb and ALL necessary components and a detailled assembly/test instruction.
3. Payment only by banking transfer, shipment via DHL, you get a tracking number.
4. MBC5X0 repair kits still available, S502 repair kits under construction.
5. Prices only upon request via PM, pls be so kind not to post them in public space
Thanks
MicUlli

I'm sure some of us here in the US would like to make our 502's better, I know I would. Is just the PCB available to the USA? Regards, Chris.

 

[pmfalcman]

This looks also similar to the Korean HMH CML-300 microphone,

I strongly suspect it's because this is a CML-300
As stated in Ali description