Super Cryo Matched Pair Preamp Tubes
These 6N1P-EV are a replacement for the 6922, 6DJ8's and the E88CC but do but have a heavier filament current draw, so be sure the power supply can handle the extra power. These EV/EB series tubes have a typically 5,000 - 10,000 hours life.
Noted for their warm sound with great high frequency extension. Because of their robust construction and wide plate voltage range, they are recommended for those troublesome preamps that are hard on tubes.
These 6N1P's have date codes of 1973.
These 6N1PP-EV's are hand selected matched tubes. After the selection process they go though a series of cryogenic processes (multiple cycles) that improves their performance even more than the normal single stage cryo treatment.
After the Super Cryo Treatment the tubes are given a 24 hour burn-in and then carefully rechecked for noise and microphonics before shipping.
Cryoset Deep Cryogenic Treatment:
The process makes a permanent change and the benefits do not deteriorate over time or upon return to operating temperature, it changes the whole way the vacuum tube performs. The major benefit has been a dramatic improvement in dynamic range, micro detail with an increase in speed.
Bass response has been clearer with a reduction in micro phonics.
The proprietary Cryoset treatment process utilizes a computer controlled, cryogenic chamber to very gradually reduce the temperature of the tubes to 300 degrees below zero (Fahrenheit) and holding them there for a minimum of 24 hours. After the extended dwell at this cryogenic temperature, the vacuum tubes are then very slowly brought up to ambient temperature over the next 24 hours and stabilized. The process is a "dry" one that utilizes liquid nitrogen as a cryogen that is flashed into the chamber. The tubes are never exposed to the actual liquid. All these processes are microprocessor controlled under strict and verifiable conditions.
Scientists have known for years that material transformations occur when they are exposed to cryogenic temperatures. Many of the early discoveries were more fully explored by NASA engineers who were trying to understand what would happen to metals when subjected to the extreme temperatures of space. Today, a wide range of commercial items from softball bats to race engines are cryogenically treated to improve their performance by enhancing the material properties with "cold treating" or cryogenic processing. This technology brings practical application to audio and other electrical components as well. Cryogenic treatment modifies the microstructure of the metals used in critical electronic components by reducing or eliminating voids and imperfections in the material. Crystal structures (or grains) has been shown to be modified after cryogenic treatment, creating a more uniform or homogenous microstructure. The thermal dissipation properties of the metals are improved, reducing hot spots and further contributing to extended life and improved performance. In addition, the physical contraction of the metals while under the deep freeze imparts a mechanical compression on the metals that contributes to improved signal transmission quality and speed. The materials used in electronics are highly fabricated and the manufacturing processes used impart or induce stresses in them.
In addition, welding and soldering adds additional stress from concentrated areas of heating. Most everyone recognizes that welded components often fail at the weld -- a "weak" spot. The weakness comes from residual stresses inherent in all materials, further exacerbated by manufacturing techniques or processes. Cryogenic treatment relieves stresses and normalizes (or stabilizes) welded and soldered areas. This mechanism is founded in the observation first made by Bose and later by Einstein, that matter is at it most relaxed state when it has the least amount of kinetic energy (or molecular activity). Absolute zero (-459 Fahrenheit) is that point where no more energy can be extracted, or when a material is at its most "relaxed" state.
While our Cryoset (R) thermal treatment does not get to absolute zero, you can understand how going to minus 300 degrees Fahrenheit for an extended dwell time enables the material to become more relaxed and stress relieved. The transformations as a result of cryogenic treatment is permanent, and does not change with time.
Bottom line, Cryogenically treated tubes are simply better sounding, more dynamic and musical than raw, off the shelf stock tubes, and Super Cryo's are even better!