Matching Beyer M55 and Philips EL6431

Netlist · 18th November 2006, 01:43 PM

I've got this classic Beyer M55 microphone and would like to wire it correctly to the mic input of the Philips EL6431.
Microphone comes with three wires and a shielding, amplifier mic input has the three plugs, hot, cold and ground.
Full schematic of EL6431 here.
I have no data on the M55 except this picture:
http://users.pandora.be/oldmicrophon...beyer_m55.html

/Hugo

Netlist · 18th November 2006, 01:44 PM

Din plug from M55:

pinkmouse · 18th November 2006, 01:47 PM

IIRC, the M55 had a specific PSU/pre, so I would imagine that the fourth pin is for HT.

Netlist · 18th November 2006, 02:03 PM

That was quick. I'll wire the hot to hot and see how far I get with grounding the other pins.

/Hugo

Netlist · 18th November 2006, 03:42 PM

Fixed...without hum.

Here's a picture for those among us interested in this old powerhouse.

/Hugo

OldAmps · 10th December 2006, 11:52 AM

Hello,

iv'e just picked up an old m55 and want to rewire it with a male xlr connector to replace the 3 pin din.

It is identical as the picture above with a three core cable plus a shield. How should I wire this to the xlr ? Other mics I have wired have used to a two core plus shield. Do I need to bridge the pins, or wire the shield somewhere else?

Any help would be greatly appreciated as would any opinions on the m55 and its uses.

Many thanks.

Netlist · 10th December 2006, 11:59 AM

Oldamps, welcome.

Honestly, I forgot. I played around with the wires till I found the good combination. Can't be that hard with only three pins.

/Hugo

OldAmps · 10th December 2006, 07:37 PM

Had a mess about with the wires and all is working now and sounding nice!
Realised that connecting either the blue or white wire to xlr pin 2 decides the hi or low impedance, the other is not used. White lo, blue hi.

cheers

Netlist · 10th December 2006, 07:57 PM

I had a quick listen to the M55 last time and believe it must have been a reporters microphone. Small, robust, handy and a perfect 'Hi-Fi' quality for AM broadcasts.

I could be wrong of course.

-=Hugo=-

18th November 2006, 01:47 PM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	IIRC, the M55 had a specific PSU/pre, so I would imagine that the fourth pin is for HT. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

10th December 2006, 11:52 AM	#6
OldAmps diyAudio Member Join Date: Dec 2006	changing beyer m55 din plug for xlr Hello, iv'e just picked up an old m55 and want to rewire it with a male xlr connector to replace the 3 pin din. It is identical as the picture above with a three core cable plus a shield. How should I wire this to the xlr ? Other mics I have wired have used to a two core plus shield. Do I need to bridge the pins, or wire the shield somewhere else? Any help would be greatly appreciated as would any opinions on the m55 and its uses. Many thanks.

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18th November 2006, 02:03 PM	#4
Netlist diyAudio Moderator Join Date: Jan 2003	That was quick. I'll wire the hot to hot and see how far I get with grounding the other pins. /Hugo

10th December 2006, 11:59 AM	#7
Netlist diyAudio Moderator Join Date: Jan 2003	Oldamps, welcome. Honestly, I forgot. I played around with the wires till I found the good combination. Can't be that hard with only three pins. /Hugo

10th December 2006, 07:37 PM	#8
OldAmps diyAudio Member Join Date: Dec 2006	Had a mess about with the wires and all is working now and sounding nice! Realised that connecting either the blue or white wire to xlr pin 2 decides the hi or low impedance, the other is not used. White lo, blue hi. cheers

10th December 2006, 07:57 PM	#9
Netlist diyAudio Moderator Join Date: Jan 2003	I had a quick listen to the M55 last time and believe it must have been a reporters microphone. Small, robust, handy and a perfect 'Hi-Fi' quality for AM broadcasts. I could be wrong of course. -=Hugo=-

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