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Vintage Shure 55c, trouble getting good sound quality

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Old April 27th 20, 02:23 PM posted to rec.audio.pro
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Default Vintage Shure 55c, trouble getting good sound quality

Thanks Scott! I tested the Shure 55 fatboy last night and it actually worked!!!!!! Very pleased. I might not have to do anything at this point but am interested in being able to use an XLR connector so I can press my California Blonde amp into services with it.
When I take the connector apart, I see that it actually has 3 wires, 1, 2, and 3 so I think it’s balanced but not sure. It’s paired with the TS connector for an unbalanced application. I ordered a Hosa MIT - 129 1/4” TS to XLR3M impedance transformer (connector) so I can use it with my amp that requires an XLR input. Not sure this will work for me. But it works perfectly right now with an old Karaoke platform I had laying around - the platform accepts the TS connector. I have to turn the volume up quite a bit however….

Based on your suggestion, I will NOT be installing the SM-58 capsule in the mike.

Any insights would be greatly appreciated.


On Monday, April 27, 2020 at 8:50:57 AM UTC-4, Scott Dorsey wrote:

> >I just purchased a Shure 55 Fatboy, not sure when it was manufactured since=
> > the written material on the mike is not legible. The exterior is in fanta=
> >stic shape and the interier components are all in tact. It has a TS 1/4" c=
> >onnector and I have NOT tested it at all. I have just ordered the TS to XL=
> >R adaptor but I'm anticipating that the Fatboy will sound terrible thus I'd=
> > like to convert it to the SM58 just as you did. Any advice in doing so wo=
> >uld be greatly appreciated. =20

> Download the manual from Shure. Make sure you get the right one... I am
> assuming from the fact that it came with a TS cable that it was the multi
> impedance model. For modern inputs, set the switch to position M.
> Take the Amphenol connector off that cable and throw the rest of it away
> because it's not useful. Connect a cable with an XLR connector to the
> Amphenol connector... you do NOT want to use an unbalanced cable with this
> microphone once it's in medum-Z mode. The Amphenol connector is wired
> with the same numbering as an XLR... pin 1 is shield, pin 2 hot, pin 3
> ground. However, the pins are not in the same positions so look at the
> numbers in the plastic block. Solder hot and fast because many of these
> are old and crispy.
> Putting an SM-58 capsule into one of these really doesn't change the sound
> very much... it still sounds terrible even with the 58 capsule in there
> because what is wrong with the sound is mostly the grille and body design
> creating all kinds of internal resonances. And putting a 58 capsule inside
> will substantially devalue it. So if it is working, I would not touch
> it... just make up the correct cable so you can use it properly with a
> normal balanced line.
> If it isn't working, put a 58 capsule in there, sure.
> --scott
> --
> "C'est un Nagra. C'est suisse, et tres, tres precis."


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