Harma Deep Cryogenic treated valves offers improvements to the sonic character of the valves and results in sound characteristics only normally found in very expensive NOS valves such as Mullards. The process involves taking the vacuum tubes and freezing them down to -312 Fahrenheit and soaking these for a minimum of 12 hours. Then the temperature is held at this low level for 24 hours. The vacuum tubes are then slowly brought up to normal levels over the next 12 hours.
Metals respond very well to deep cryogenic process. The reasons are as follows, during the cooling or solidification phase of the manufacturing process, molecules are trapped in a haphazard pattern. This is down to stress caused in the bending and welding of the anode plate material. This random placement causes obstacles for electrons and when encountered this interference can cause noise, slow down electron flow and sound deterioration affecting the quality of the sound of the vacuum tube. .
At very cold temperatures (below -312 Fahrenheit), the molecules will align in a more uniform, compact structure through the removal of kinetic energy. When the material is returned to ambient temperature, this new uniform, compact pattern is maintained, Thus changing the structure of the nickel permanently. This 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 biggest benefits I have found have been a dramatic improvement in the sound quality. The bass response has been clearer with reduction in microphonics and clear more transparent highs. Cryogenic treatment has now become a way for a modern valve to produce a sound quality that approaches the iconic originals.
The Harma 6922 Cryo treated is a special quality valve that is the best sounding military Russian 6922 type that was made.
This item has is very low noise and microphonics and out performs all NOS valves from Mullard, Philips, RCA, G.E in this respect. This item is not the same as the Sovtek, Electro Harmonix or the Gold lion current production items. This in fact is the superb original military 6H23-EB. If you look on the internet you will see nothing but praise and super reviews of this valve.
The valve has plenty of deep bass definition which is very detailed and rhythmical. It also has a very musical and transparent midband which is excellent on vocals and strings.
The top end is also very clear without the hardness that is common in all the current production ECC88- 6922 valves.
We have a small stock of cryogenically treated 6922 for the ultimate audio performance.
The Cryo treatment enhances the valves performance and provides silky smooth highs with a more musical midrange and improved bass clarity.
This valve is excellent in all high end audio applications as well as CD, tube microphones & phono stages. Unfortunately we only have a very limited stock of this super valve so upgrade today while we still have the stock. The Chinese 6922-6DJ8 type is commonly called a 6N11 tube in China. The Harma 6922 is direct replacement for this valve and E88CC & ECC88