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.

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
12DW7/7247-GENERAL ELECTRIC CRYO	General Electric Cryo	Special Cryo treated version of the Premium Industrial specification 7247/12DW7 G.E valve.The G.E ...	In stock	£32.00
12DW7/HARMA-CRYO	Harma Cryo	The Harma 12DW7 Cryo is based on the American dual plate design that was popular in the late ...	In stock	£12.00	Image coming soon
5687WB/HARMA U.S.A -Cryo	Harma Cryo	These Harma 5687WB Cryo are U.S.A made original military grade specification double triode in ...	In stock	£20.00	Image coming soon
5687WB/PHILIPS CRYO	Philips Jan	Original USA made 5687 WB Philips Cryo military grade JAN specification double triode which will ...	In stock	£22.00
5703WB/RAYTHEON CRYO	Raytheon Cryo	Original USA made 5703 WB Raytheon Cryo is an instant upgrade over the standard 5703. THE CRYO ...	In stock	£20.00	Image coming soon
5842WA/417 RAYTHEON CRYO	Raytheon	Original USA made 5842 WA Raytheon Cryo is an instant upgrade over the standard 5842 and the ...	In stock	£28.00
5881/HARMA-CRYO	Harma	The Harma 5881-Cryo is the button based Russian military valve is the same valve which powered the ...	In stock	£20.00
5881/HARMA-CRYO MESA BOOGIE 400 PLUS SET	Harma Cryo	Here is a special Cryo set for all you owners of the Mesa Boogie 400 plus bass head who want ...	In stock	£240.00
5881WXT/6L6RB-SOVTEK-CRYO	Sovtek Cryo	The Sovtek 5881 WXT has become the industry standard 6L6 type, Fitted by Fender and used by Groove ...	In stock	£18.00 £16.20
5U4G/HARMA-CRYO	Harma Cryo	Harma 5U4G-STR is a long life Military grade Rectifier which has been cryogenically treated to give ...	In stock	£30.00
6072A/12AY7/GENERAL ELECTRIC-CRYO	General Electric Cryo	Original General Electric 6072A/12AY7 Cryo which are made to the full joint Army and Navy ...	In stock	£65.00
6111WA/PHILIPS-CRYO	Philips Cryo	This is a specially cryo treated 6111WA for use in Neumann M149 tube microphones.These benefit from ...	In stock	£40.00
6C45PI/SOVTEK-CRYO	Sovtek Cryo	The Super Russian 6C45PI is an audio super valve that has excellent sound characteristics. This ...	In stock	£22.00
6GK5/6FQ5/HARMA-CRYO	Harma Cryo	These specially treated cryo 6GK5 offer the Conrad Johnson owners the ulimate performance.They ...	In stock	£18.00
6L6GC-S.T.R C /TAD CRYO	Tube Amp Doctor Cryo	The Cryo T.A.D 6L6GC-STR is an excellent valve and in sonic terms out performs the standard ...	In stock	£22.00
6L6GC/JJ-TESLA -CRYO	JJ-Tesla Cryo	The JJ-Tesla 6L6GC Cryo is the best sounding version of JJ 6L6GC valve available today. The Cryo ...	In stock	£20.00 £17.00
6L6GC/RETRO/HARMA-CRYO	Harma Cryo	The Harma 6L6GC Retro is a re issue of the famous Sylvania STR 387 that was produced for Fender in ...	In stock	£22.00 £19.80
6L6GC/STR/HARMA-CRYO	Harma Cryo	The Harma 6L6GC STR-CRYO has a number of features that make this ideal in all audio and guitar ...	In stock	£22.00
6L6GC/SVETLANA / WINGED C CRYO	Svetlana Winged C Cryo	The design of this valve has its roots in the famous Sylvania STR387. The valve features thick mica ...	In stock	£30.00
6L6WGB/5881 JAN PHILIPS CRYO	Philips Cryo	These are A Cryo Treated version of the original small bottle American Military JAN 6L6WGB/5881 ...	In stock	£38.00 £35.00

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