Hoffman Amplifiers Tube Amplifier Forum
Other Stuff => Effects => Topic started by: jjasilli on August 25, 2014, 09:45:53 pm
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Vintage Shure Bullet Mic
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Could you elaborate on what your doing/going for on this please? (Adding a volume control?)
Brad :think1:
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This is a vintage Shure bullet mic; specs stated in first post & schematic. Tested the voice coil on a DVM and got a reading in the ballpark per internet research. The point was to ready it for performance as a harp mic into a tube guitar amp. The bullet body has two holes in the bottom: mid & rear. The rear hole accepts a signal cable. So I permanently attached a 2-conductor mic cable. The cable has zip ties inside and outside the mic body to serve as strain reliefs.
The mid-bottom hole in the mic body is to screw the mic to a stand; but a stand isn't needed for a harp mic. The hole happens to accept a mini pot, so installed a vol. control there. The new issue Shure bullet mic's for harp have this feature. This enables to player to adjust or kill the mic signal w/o having to reach for the amp.
The voice coil is hi impedance and lo output at 1.1K DC resistance. (For comparison: a vintage single coil Strat is about 4K; humbuckers 8K) So, ambient noise could be an issue. To reduce noise, I used a 2 conductor mic cable, so all signal, + & ground, are in internal leads, shielded by the outer braid. The outer braid also functions as the chassis connection between the amp & mic body.
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Interesting specs at the Shure Microphones Website. for The 520SL Cool, thanks; didn't think to look there!!!
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The point was to ready it for performance as a harp mic into a tube guitar amp. The bullet body has two holes in the bottom: mid & rear. The mid-bottom hole in the mic body is to screw the mic to a stand; but a stand isn't needed for a harp mic. The hole happens to accept a mini pot, so installed a vol. control there.
Ok, now I see, thanks JJ.
Brad :icon_biggrin: