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 -312F), 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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  • NameManufacturerCommentStockPrice 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£20.00Buy 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£22.00Buy Now
  • 5U4GB-HARMA RETRO CRYOHarma Cryo The Harma Retro Cryo 5U4GB is a specially Cryogenically treated version offering the ultimate in performance.The Harma ...In stock£20.00Buy Now
  • 6550A-HARMA RETRO CRYOHarma Cryo The Harma 6550A Retro Cryo is a meticulous recreation of the classic General Electric 6550A as the Original American ...In stock£36.00Buy Now
  • 6922/ E88CC-HARMA CRYOHarma Cryo The Harma 6922 Cryo treated is a special quality valve that is the best sounding military Russian 6922 type that was ...In stock£50.00Buy 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£18.00
    £14.00
    Buy 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£22.00Buy 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£24.00Buy Now
  • 6L6GC-HARMA STR-CRYOHarma Cryo The Harma 6L6GC STR-CRYO has a number of features that make this ideal in all audio and guitar amplifier applications. ...In stock£22.00Buy 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£15.00Buy Now
  • ECC81-HARMA STR CRYOHarma Cryo The Harma ECC81-CRYO is a specially treated and selected valve for use in critical positions in both audio and guitar ...In stock£16.00Buy Now
  • ECC83-HARMA RETRO CRYOHarma Cryo The Harma ECC83 Retro CRYO is a true sounding recreation of the famous Mullard ECC83.Unlike many tube suppliers, we are ...In stock£20.00
    £18.00
    Buy Now
  • ECC83-HARMA RETRO-BALANCED CRYOHarma Cryo Special Cryo balanced item with matched sections for use in phase inverter position, tube microphones or input ...In stock£22.00Buy 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£18.00
    £16.00
    Buy 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£20.00
    £18.00
    Buy Now
  • ECC83/ 7025 HARMA DR250-CRYO-Hi Gain-Harma Cryo The Harma 7025 Dr250 High Gain Cryo is the perfect valve where clarity and gain are the main requirements. This valve ...In stock£17.00Buy Now
  • EL34/ E34L-HARMA STR CRYOHarma Cryo The Harma STR E34L has found favour with many professional rock guitarists since it was road tested by Ben Matthews of ...In stock£20.00Buy Now
  • EL34/ HARMA-RETRO-CRYOHarma Cryo The Harma EL34-Retro is based on the famous Mullard EL34 and has a number of important features over standard EL34 ...In stock£22.00Buy Now
  • EL84/ E84L-HARMA CRYO BURST TESTEDHarma Cryo The Harma E84L Bust Tested Cryo is a high quality special application military valve which has a number of unique ...In stock£20.00Buy Now
  • EL84/ HARMA-RETRO-CRYOHarma Cryo The Harma EL84 Retro Cryo is a recreation of the famous Mullard EL84 and follows the original design and electrical ...In stock£22.00Buy 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£20.00Buy Now
  • GZ34/ 5AR4-HARMA RETRO CRYOHarma Cryo This is a special cryogenically treated version that offers the highest performance.The Harma GZ34 Retro Cryo design is ...In stock£22.00Buy Now
  • KT66-HARMA-RETRO CRYOHarma Cryo The Harma KT66-Retro Cryo is a meticulous recreation of the famous Marconi Osram KT66 and follows the original design ...In stock£45.00Buy Now
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