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Harma Cryo / 6922/E88CC-HARMA CRYO MATCHED PAIR
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All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by the UK only.
A test report is available click here to view
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.
Special Matched PairsMetals 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.
This is a special balanced version with matched triode sections available in matched pairs. For use in in critical positions in Tube compressors and driver stages in Audio amplifiers
The Harma 6922 Cryo treated valve is the best Military Russian 6922 type made and is the best that we have ever used in all audio applications.
This item has very low noise and super low microphonics and out performs all NOS valves from Mullard, Philips, RCA, G.E in this respect. This item is not the same as the current Sovtek, Electro Harmonix or the Gold lion current production items. This is in fact SUPERB original military 6H23-EB which if you look on the internet you will see nothing but praise and super reviews.
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. 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.
This will be the last chance that we will be able to offer this super military 6922 valve in cryo treated format.
We offer these in Specially Selected Balanced triode sections in matched pairs use in High grade Compressors and Audio Phono and Pre Stages.
These Balanced preamp valves are Dynamically Drive tested under real working condition and are matched on dB gain. They also have passed the following tests:
Gain (db) Drive Tested
Transconductance (gm) Drive Tested
Output Drive Tested
Noise 1 (signal to noise)
Noise 2 (Aural)
Microphonics Test 1(Ambient)
Microphonic Test 2 (Shock)
Cathode Test
Grid Leakage Test
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