What the hell happened to this 60's SM58 of mine?!

|-| · 18th November 2011

So I have this very old SM58 from the 60's (possibly early 70's) and it stopped working, smelt weird, bla bla

I open the XLR connector and there is brown goo everywhere! Has anyone seen anything like this? It looks like a melted chocolate bar inside!

I know about Shure's excellent repair policy of sending it in, paying $60'ish or so and getting a brand new mic back. But being how old this thing is, I'd really like to have this fossil back up and running.

Warfunkel · 18th November 2011

Looks like the potting got burnt and oozed out. Something must have shorted or burnt out inside of it. The glue might make it hard to work on if it got all over the faulty part(s).

oldeanalogueguy · 18th November 2011

Quote:

Originally Posted by |-|

So I have this very old SM58 from the 60's (possibly early 70's) and it stopped working, smelt weird, bla bla

I open the XLR connector and there is brown goo everywhere! Has anyone seen anything like this? It looks like a melted chocolate bar inside!

I know about Shure's excellent repair policy of sending it in, paying $60'ish or so and getting a brand new mic back. But being how old this thing is, I'd really like to have this fossil back up and running.

guessing old age
some plastic part lost its chemical structure

audiotech · 18th November 2011

A guess, maybe the transformer had a shorted winding and the microphone was used on an energized phantom powered circuit. Just a guess, lol.

Dennis

18th November 2011	#1
\|-\| Gear maniac Joined: Dec 2010 Location: Detroit Posts: 205 Thread Starter	What the hell happened to this 60's SM58 of mine?! So I have this very old SM58 from the 60's (possibly early 70's) and it stopped working, smelt weird, bla bla I open the XLR connector and there is brown goo everywhere! Has anyone seen anything like this? It looks like a melted chocolate bar inside! I know about Shure's excellent repair policy of sending it in, paying $60'ish or so and getting a brand new mic back. But being how old this thing is, I'd really like to have this fossil back up and running. Attached Thumbnails __________________ Drums: DRM1 mkII, TR-606 w/Midi, TR-707, TR-727, TR-808 w/Midi, TR-909 (R.I.P.) Synths: SH-101, MC-202 w/Midi, TB-303, JP-8000, Juno-60/106, Mono/Poly, CS-5, Waldorf Q, MicroWave XT, Virus Rack Outboard: KSP8 w/RSP8, DP/4+, D-Two, Vortex, Pro-2000 w/DCB, StudioComm 68A/69A, 166XL, RME Octamic II Pedals: Every MoogerFooger (2x MF-104z), Fuzzface, DD-7, Wylde Wah Computer: MacBook Pro i5 13" 8GB\|500GB 7200rpm, RME UFX, Art DI/O, LaunchPad, MidAir 25, Pro Tools 9, Live 8 w/Max For Live

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

18th November 2011	#2
Warfunkel Gear nut Joined: Apr 2010 Posts: 119	Looks like the potting got burnt and oozed out. Something must have shorted or burnt out inside of it. The glue might make it hard to work on if it got all over the faulty part(s).

18th November 2011	#4
audiotech Gear addict Joined: Oct 2011 Posts: 338	A guess, maybe the transformer had a shorted winding and the microphone was used on an energized phantom powered circuit. Just a guess, lol. Dennis