Products > Cryo Valves > Harma Cryo

DEEP CYROGENTIC TREATMENT The process involves taking the vacuum tubes and freezing them down to -312 f and soaking these for a minimum of 12 hours. Then the temp 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 deteriation affecting the quality of the sound of the vacuum tube. At very cold temperatures (below -312Â°F), 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 has been a dramatic improvement in dymanic range. Bass response has been clearer with reduction in microphonics. The really most starling fact as been how the valve operates under saturated and overdriven conditions. This has made some of the more basic Fender amps sound fuller and warmer.

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.

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NameBrandCommentStockPrice PhotoOrder
5881-HARMA CRYOHarma Cryo The Harma 5881 Cryo is the button based Russian military valve is the same valve which powered the Marshall and Mesa ...In stock£36.00Buy Now
5881-HARMA CRYO MESA BOOGIE 400 PLUS SETHarma Cryo Special Offer 10% Discount

Here is a special Cryo set for all you owners of the Mesa Boogie 400 plus bass head ...In stock£~~432.00~~
£388.80Buy Now
5881-HARMA MESA SELECT CRYOHarma Cryo Mesa Select for use in Mesa Boogies

The Harma 5881 Cryo is the button based Russian military valve is the same ...In stock£36.00Buy Now
6072A/ 12AY7-HARMA STR CRYOHarma Cryo The Harma 12AY7 STR Cryo has a number of excellent features which when Cryo treated has become one of our most sought ...In stock£26.00Buy Now
6GK5/ 6FQ5-HARMA CRYOHarma Cryo These specially treated cryo 6GK5 offer the Conrad Johnson owners the ultimate performance. They provide a more ...In stock£20.00Buy Now
6L6GC-HARMA RETRO CRYOHarma Cryo The Harma 6L6GC Retro is a re issue of the famous Sylvania STR 387 that was produced for Fender in the early 1970s.This ...In stock£40.00Buy Now
6L6GC-HARMA RETRO CRYO MESA SELECTHarma Cryo Mesa Select for use in Mesa Boogies

The Harma 6L6GC Retro Cryo Mesa Select is a re issue of the famous Sylvania ...In stock£44.00Buy Now
6N1P-VI-HARMA CRYOHarma Cryo The Harma 6N1P VI Cryo is a special long life, low noise version of the 6N1P. They are all selected to very tight ...In stock£24.00Buy Now
ECC81-HARMA STR CRYOHarma Cryo The Harma ECC81 STR CRYO is a specially treated and selected valve for use in critical positions in both audio and ...In stock£26.00Buy Now
ECC81-HARMA STR CRYO BALANCEDHarma Cryo The Harma ECC81 STR CRYO is a specially treated and that has balanced sections for use in critical positions in both ...In stock£30.00Buy Now
ECC81-HARMA STR CRYO BALANCED PAIRSHarma Cryo Matched Pairs

The Harma ECC81 STR CRYO is a specially treated and that has balanced sections for use in critical ...In stock£30.00Buy Now
ECC83-HARMA RETRO BALANCED CRYOHarma Cryo The Harma ECC83 Retro balanced Cryo is a true sounding recreation of the famous Mullard ECC83.This is a special Cryo ...In stock£36.00Buy Now
ECC83-HARMA RETRO CRYOHarma Cryo The Harma ECC83 Retro Cryo is a true sounding recreation of the famous Mullard ECC83.The valve produces a harmonically ...In stock£32.00Buy Now
ECC83-HARMA STR CRYOHarma Cryo The Harma ECC83 STR Cryo has the most neutral and warmest sounding with the Classic vintage tone when compared to all ...In stock£26.00Buy Now
ECC83-HARMA STR CRYO BALANCEDHarma Cryo Special balanced item with matched sections for use in phase inverter position, tube microphones or input positions ...In stock£30.00Buy Now
ECC83/ 7025-HARMA DR250 CRYOHarma Cryo Special Offer 20% Discount

The Harma 7025 Dr250 Cryo is the perfect valve where clarity and gain are the main ...In stock£~~30.00~~
£24.00Buy Now
EL34-HARMA RETRO CRYOHarma Cryo The Harma EL34 Retro Cryo is a specially Cryogenically treated version designed to give you enhance audio performance. ...In stock£42.00Buy Now
EL84/ E84L-HARMA CRYO BURST TESTEDHarma Cryo The Harma E84L Burst Tested on the tester designed for Brian May

This valve is the specially treated cryogenic ...In stock£36.00Buy Now
EZ81/ 6CA4-HARMA RETRO CRYOHarma Cryo The Harma EZ81 Retro is based on the European design used by Mullard and Philips in the 1960s for military ...In stock£30.00Buy Now