33 rpm 7 inch6/15/2023 However, if test pressing does not meet guidelines, together with the publisher we identify potential irregularities and help eliminate them. Once sample copies are approved, we can start making the main edition. They allow publishers to check the overall quality of the design, the material used in production and, above all, the sound. It creates the “plastic hardening” effect. Records pressed in this way are immediately cooled down and sent to the final manufacturing stage where excess material is trimmed. Before a piece of material is entered and pressed with the matrix, a label with description is pressed into the centre of the record. Matrices are placed in a press and the groove pattern is pressed in a heated mixture. In any doubt, the speed is usually written on the central label. Once a matrix is made, on the next stage a mixture is prepared. As a general rule, 12 vinyl are 33 RPM and 7 are 45 RPM. Cutting in copper helps to reduce noise and improve the precision of transferring information at higher frequencies, and to reduce mutual reactions of neighbouring grooves. Lathe cut custom vinyl disc 7 inch LP record with shiny tracks. The copper disc plays the role of the mother and is used for making manufacturing matrices. Choose from 23 33 Rpm stock illustrations from iStock. 45 RPM Records RCA Records first introduced the 45 RPM record. The 33 rpm of 17 cm (7 inches) are called EP (for Extended play) and. Columbia Records launched a 33 RPM record player with the ability to play both sides that didn’t need flipping the dish over. The 7-inch 45 rpm record was released March 31, 1949, by RCA Victor as a smaller, more durable and higher- fidelity replacement for the 78 rpm shellac discs. A properly adjusted head cuts a groove in a copper disc. A seven inches, or 7 in short, is a vinyl record measuring 7 inches in diameter. In the Direct Metal Mastering technique, the whole process is shortened. An LP is able to hold about 30 minutes of sound per side. Due to the evolution of the way people think. There has been much change for the speeds of the phonograph. Old-fashioned 10 inch records were played at 78 rpm. Subsequent generations are called the “father” (negative), the “mother” (positive), and at the end we have matrices (negative) used directly for record pressing. A 12 inch long-playing record (LP) is normally played at 33 1/3 rpm. But remember that the weight can vary per record. In the traditional vinyl record manufacturing process, during the first stage, a lacquer disc is cut which is used for making more metal copies. In general a 7-inch 45 rpm record will weigh around 40 grams, a 10-inch 78 rpm record will weigh up to 110 grams and a 12-inch 33 rpm record will weigh anywhere in between 80 and 180 grams. The DMM technique was developed as a better alternative to the traditional process of preparing matrices used for vinyl record pressing. Direct Metal Mastering (DMM) is the name of a process used in the manufacturing of analog fine-grooved records.
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