Products: Cryo Valves

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 -312°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 Cryo valves Harma Deep Cyrogenic Treated valves offers the immense warmth and smooth distortion 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 f and soaking these for a minimum of 12 hours. Then the temparature 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 -312°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. Some day all valves will be treated this way.

Click below to read our rave reviews on Cryo treated valves from the following magazines.
May 2006 p123 Article by Nick Guppy Harma Cryogenically Treated Valves	April 2006 p77 Article by Tim Slater Harma Vacuum Tubes
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Name	Manufacturer	Comment	Stock	Price	Photo	Order
12DW7/HARMA-CRYO	HARMA Cryo valves	This disimilar Triode is used in the famous Ampeg S.V.T .We have supplied countless numbers of ...	In stock	£14.00	Image coming soon
5687WB/HARMA U.S.A -Cryo	HARMA Cryo valves	These Harma 5687WB Cryo are U.S.A made original military grade specification double triode in ...	In stock	£18.00	Image coming soon
5881 SELECTED BOOGIE 400 PLUS SET -CRYO	HARMA Cryo valves	Here is a special Cryo set for all you owners of the boogie 400 plus bass head who want upgraded ...	In stock	£228.00 £193.80
5U4G/HARMA-CRYO	HARMA Cryo valves	Harma 5U4G is a long life Military grade Rectifier which is ideal for use in high end guitar and ...	In stock	£28.00
6GK5/6FQ5/HARMA-CRYO	HARMA Cryo valves	These specially treated cryo 6GK5 offer the Conrad Johnson owners the ulimate performance.They ...	In stock	£18.00
6L6GC/RETRO/HARMA-CRYO	HARMA Cryo valves	The Harma 6L6GC Retro is based on the famous Sylvania STR 387. The valve breaks up later than the ...	In stock	£22.00 £20.00
E88CC/6922/6N11/HARMA CRYO	HARMA Cryo valves	This is a very early 80s produced Russian Military surplus valve which is very low on noise and ...	In stock	£42.00
ECC81-STR/HARMA-CRYO	HARMA Cryo valves	The HARMA ECC81-CRYO is a specially treated and selected valve for use in critical positons in both ...	In stock	£16.00
ECC81-STR/HARMA-CRYO BAL	HARMA Cryo valves	The HARMA ECC81- STR CRYO BALANCED is a specially treated and Selected for use in Amplifiers. It ...	In stock	£20.00
ECC83-RETRO/HARMA CRYO	HARMA Cryo valves	The Harma ECC83 Retro CRYO is a true sounding recreation of the famous Mullard ECC83.Unlike many ...	In stock	£20.00 £18.00	Image coming soon
ECC83-STR/HARMA CRYO	HARMA Cryo valves	The new Harma STR ECC83 is a recreation of the famous Telefunken ECC803S.The valve has a frame grid ...	In stock	£18.00 £16.00
ECC83-STR/HARMA CRYO-BALANCED	HARMA Cryo valves	Special Cryo balanced triode/matched sections version for use in the phase splitter position or ...	In stock	£20.00 £18.00
ECC83/7025 HARMA DR250-CRYO-Hi Gain-	HARMA Cryo valves	At last a true high gain valve that provides low noise, low microphoney. The Harma ECC83/7025 HAS ...	In stock	£17.00 £15.31
EL34/E34L/STR HARMA CRYO	HARMA Cryo valves	The Harma STR E34L has found favour with many professional rock guitarists since it was road ...	In stock	£20.00
EL34/HARMA-RETRO-CRYO	HARMA Cryo valves	The Harma EL34-Retro is based on the famous Mullard EL34 and has a number of important featues over ...	In stock	£20.00
EL84/E84L/HARMA CRYO	HARMA Cryo valves	The Harma E84L is a high quality special application military valve. The valve has rugged ...	In stock	£16.00
EL84/HARMA-RETRO-CRYO	HARMA Cryo valves	This is a specially Selected and Cryo treated Harma EL84 Retro.The HARMA EL84 Retro is based on ...	In stock	£22.00 £20.00
EL84/VIN/HARMA-CRYO	HARMA Cryo valves	We are proud to introduce the Harma Vintage EL84. These are military sourced tubes from the ...	In stock	£24.00
GZ32/5V4GA/HARMA-CRYO	HARMA Cryo valves	The HARMA GZ32 is a more compact bottle than the famous MULLARD GZ32 but still retains that ...	In stock	£20.00
GZ34/STR HARMA CRYO	HARMA Cryo valves	The HARMA GZ34 is modelled on the early Mullard long plate GZ34.The valve provides correct ...	In stock	£22.00 £18.00

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