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Natural Science Forum / Physics / Acoustics / December 2004GenRad 1986/1987 B&K adapter
Hey all, Does anyone have a spare GenRad 1986/1987 calibrator B&K-microphone adapter that they're looking to sell? Alternatively, does anyone know where I can buy a B&K adapter? IET Labs (who inherited GenRad's business) doesn't have any, and a few inquiries have come up short. I know some consultants who have some, but they don't want to part with them. An IET Labs tech suggested taking a GenRad mic adapter and reaming out the whole to the B&K spec. Since I have access to a B&K adapter, I can get the dimensions, but for peace of mind I'd rather use the genuine article.  SignatureHerb Singleton usenet3@ross-specrtrum.com Sound & Vibration Measurements http://www.cross-spectrum.com Have you tried replacing the "O"-ring in the GenRad coupler with one having a slightly larger diameter hole. A B&K microphone is slightly greater in diameter than a GenRad one by virtue of the protection grid. It is only marginally bigger but it will snag the GenRad O-ring. This only applies to ¼" and ½" micrpohones; 1" are equivalent. Denis R. Robinson > Hey all, > > Does anyone have a spare GenRad 1986/1987 calibrator B&K-microphone > adapter that they're looking to sell? > Have you tried replacing the "O"-ring in the GenRad coupler with one having > a slightly larger diameter hole. A B&K microphone is slightly greater in > diameter than a GenRad one by virtue of the protection grid. It is only > marginally bigger but it will snag the GenRad O-ring. This only applies to > ¼" and ½" micrpohones; 1" are equivalent. It's not the O-ring, the GR-1/2" hole on the adapter is physically smaller than the B&K-1/2" hole (owing to the slightly larger B&K diameter, as you noted). It seems the only realistic option is to drill out the GR hole. Herb SignatureHerb Singleton usenet3@ross-specrtrum.com Sound & Vibration Measurements http://www.cross-spectrum.com > Hey all, > > Does anyone have a spare GenRad 1986/1987 calibrator B&K-microphone > adapter that they're looking to sell? A follow-up: First, thanks to everyone that tried to help. I borrowed an B&K 1/2-inch adapter from a colleague, and I had a machine shop make copies. I have about a dozen extra adapters that I'm willing to sell for $50/each + shipping (volume discounts available). If you know of any old-timers that are in love with their GenRad 1986/1987 calibrators and need some adapters, have them drop me a line. No warranty is offered - if you don't like it, send it back and I'll refund the money (minus shipping costs). Herb SignatureHerb Singleton usenet3@ross-specrtrum.com Sound & Vibration Measurements http://www.cross-spectrum.com Herb Singleton <usenet3@cross-spectrum.com> wrote in news:usenet3- 5385D5.15101015122004@news.giganews.com: >> Hey all, >> [quoted text clipped - 15 lines] > > Herb Too bad you didn't wait just a bit longer. Someone recently offered three on eBay for $60. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3861385872 > Too bad you didn't wait just a bit longer. > Someone recently offered three on eBay for $60. > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3861385872 That would be me. ;) Herb SignatureHerb Singleton usenet3@ross-specrtrum.com Sound & Vibration Measurements http://www.cross-spectrum.com |
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