THANK YOU Ben!! I actually figured someone had contacted ES at some point and hoped they'd chime in. Another mystery solved through the endless wisdom of our list members. Again, many thanks!
Robert ----- Original Message ----- From: "eug4not" <[email protected]> To: <[email protected]> Sent: Saturday, May 06, 2006 2:40 PM Subject: [Phono-L] Tip radius of the RCA orange shank needles > Hi folks, > > There has been some recent discussion about the point radius of the orange shank chrome > plated needles RCA sold for playing their coarse-groove LP records. I remember, in 1979, > sending an orange shank needle to Expert Pickups in England. I asked them to measure the > tip radius and replace the diamond in a Stanton D 5127 cartridge insert I sent them with a > spherical diamond having the same radius. They measured the tip radius measured to be > .002". > > I recently optically compared the tips of an orange and green shank RCA needle. Although I > didn't have the instrumentation to measure each tip separately, I was able to determine that > the average radius of the tips of the two needles was 0.1 millimeter. This equates to an > average radius of 0.0025". Using the 0.002" figure measured at Expert Pickups, this gives > the expected tip radius of 0.003" for the green shank needle. > > BTY, an RCA advertising piece for the coarse groove records mentions a playing time of 5 > hours for the orange shank needle, when used to play the coarse groove LPs. > > Best regards, > > Ben H. Tongue > > _______________________________________________ > Phono-L mailing list > [email protected] > > Phono-L Archive > http://phono-l.oldcrank.org/archive/ > > Support Phono-L > http://www.cafepress.com/oldcrank >
