A Step-By-Step Guide To The Reissue Process
Step In The Reissue Process Is To Procure The Master Tape.
Once a MASTER TAPE is
chosen, engineers will compare it against an original issue LP to analyze
differences in audio quality.
Tony Hawkins with an original Decca LP.
The comparison involves playing the original LP on a cutting lathe, which is outfitted with a tonearm and cartridge.
Playing the original Shaded Dog LP on the lathe.
The engineers will equalize the master tape and LP at the same level before using an A/B switch on the mastering board to alternate between the two audio sources, listening for any discrepancies in the process.
Bernie Grundman and Tony Hawkins
A/B-ing the sources.
In the case of a three-track master, A/B-ing also determines the amount of "center" audio signal to mix to the right and left channels. Such close examination of the master tapes and various versions of the LP will inevitably reveal many unexpected details, which are then documented in mastering notes and write-ups.
After hours of A/B-ing the tape and applying
different amounts of equalization (ranging from none to a fair amount),
preparations are made to transfer the results to lacquer.
Bernie Grundman about to start cutting a lacquer.
The carved-out lacquer material is continuously vacuumed away from the cutter stylus and collects in a nearby container. After a complete LP side is cut, the lacquer is inspected with a microscope attached to the lathe (see below). The engineers examine it for a clean cut, making sure that no grooves have collided.
It is interesting to note that the musical selections on the master tape are organized into a continuous LP side (including the silent spaces between the album tracks), so that the transfer can be made without stopping and starting the spinning platter.
Bernie Grundman at the lathe,
checking the grooves after cutting a side.
The lacquer is then placed in a container and sent to the plating plant as soon as possible. The packaging is made of Styrofoam to minimize changes in temperature. Since the freshly cut lacquer material is somewhat malleable, its grooves are particularly sensitive to climate fluctuations.
Once the lacquer is cut, it goes to the plating plant to be electroplated. This process begins with packing the lacquer and gently cleaning it in a mild detergent-based solution. The lacquer is then rinsed repeatedly with highly purified (di) water before being placed on a spindle in the silvering booth. There it is then spun around and sprayed with liquefied silver.
Spraying liquefied silver onto a lacquer.
After the lacquer is "silvered," it is re-cleaned with di water, attached to a bar, and placed in a pre-plate bath of dissolved nickel. When electrically charged, the nickel will naturally adhere to the silver on the lacquer surface.
A freshly silvered lacquer,
and the nickel pre-plate tank.
The lacquer stays briefly in the pre-plate tank before it is spun around in the high-speed baths (see below), where nickel is more quickly accumulated, using greater amperage. This process creates a key component called a master. The amount of time the lacquer stays in this solution determines the weight of the master, which is sometimes called a metal part.
High speed nickel baths for making stampers.
The master is next separated from the lacquer, creating an exact reverse image, with ridges instead of grooves. Sometimes it is used to press records in a process called one-step. In that case, the master is referred to as a one-step stamper. Unfortunately, it can only produce up to 800 records before wearing out. In addition, the lacquer cannot be re-used to form another master. To avoid these shortcomings, the master, like the lacquer before, is put back in the bath for more nickel plating, creating a new element called the mother.
The late Ed Tobin with an Iberia mother
in its protective pocket.
The mother is then sound-tested on a turntable with a normal stylus. Sound-testing the mother is virtually like playing a record on a standard phonograph. If a tick or pop is heard, the mother is stopped and backed up with the stylus still in the groove, in a fashion similar to the "scratching" of nightclub DJs! By gently moving the mother back and forth, using the stylus as a sort of chisel, most small ticks can be backed out. The ticks indicate impurities in the bottom of the groove, picked up from either the bath or air. In some cases, the tick cannot be backed out and must be removed with a tiny probe while carefully examining the disk with a microscope.
The sound-tested mother is then placed back in the baths and subjected to re-plating. This will produce yet another stamper. The mother can be re-plated up to eight times to produce multiple stampers. Similarly, the master can be re-plated up to four times, yielding numerous mothers, which will in turn produce new stampers. This process may spawn as many as 25 stampers, which are capable of pressing upwards of 15,000 records!
The Next Step Is The Pressing Plant!
The stampers are trimmed and fitted
onto the record press:
Rick, the plant foreman at RTI,
inspecting the inside of a record press.
A stamper for Side One is placed in the top chamber of the press, while the Side Two stamper is attached directly below. A donut of molten vinyl, sandwiched between the two labels which will identify the record, are set in position by an automated mechanism.
In a one-step process, the stampers press the materials together to create a two-sided LP, complete with record labels. The hot vinyl is spread across the stampers, filling in the engraved valleys to form record grooves. The press remains clamped for about a minute before it is pulled apart, revealing the new disk. Excess vinyl on the outer perimeter is trimmed away and it is placed on a spindle with other new records to slowly cool. At the same time, a new vinyl is placed between the stampers to press the next LP.
After cooling, the records are inspected and packaged for shipment. Periodically, a newly pressed disk is removed from the spindle and taken to quality control. Inspectors will listen for any imperfections caused by the press. When a problem is detected, the machines are stopped and adjusted before stamping is resumed.
Sounds easy, huh?