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Products: Cryo Valves
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Cryogenic Valves CatalogueDEEP 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.
 
Guitarist
May 2006 p123
Article by Nick Guppy
Harma Cryogenically
Treated Valves
Guitar Buyer
April 2006 p77
Article by Tim Slater
Harma Vacuum Tubes
You will need Adobe Acrobat to view

All prices contained on this page are exclusive of VAT.
This is currently charged at 17.5% and is payable by all EU countries.
Name Manufacturer Comment Stock Price Photo Order
12BH7A/GE-CRYO GENERAL ELECTRIC CRYO VALVES Special Cryo Treated Version of the Original U.S.A made 12BH7A which was used by many American high ... In stock £32.00 Image coming soon
12DW7/7247/ECC832/GE-CRYO GENERAL ELECTRIC CRYO VALVES 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 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
5703WB/RAYTHEON CRYO Raytheon Cryo Used by Musical Fidelity in a wide range of audio products. These are cryo treated versions of this ... In stock £16.00 Image coming soon
5842WA/417 RAYTHEON CRYO Raytheon Military grade 5842WA from the American Raytheon company.This is an excellent audio tube and is a ... In stock £25.00
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
5881/HARMA-CRYO Harma Here is a special Cryo 5881 for all you owners of Marshall and Boogie amplifiers. This valve also ... In stock £19.00
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
5Y3WGTA/SYLVANIA-CRYO SYLVANIA CRYO The SYLVANIA 5Y3WGTA is a long life Military grade rectifier. The valve has the classic black box ... In stock £24.00
6072A/G.E SELECT MIC CRYO GENERAL ELECTRIC CRYO VALVES Military grade 6072A/12AY7 JAN specification. This valve is the best sounding one out there. ... Sold Out £45.00
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
6550C/SVETLANA/WINGED C CRYO SVETLANA/WINGED C CRYO VALVES The Svetlana 6550C is regarded as one of the best 6550 available today. These are the ORIGINAL ... In stock £38.00
6922/E88CC/PHILIPS-CRYO Philips Cryo The performance of the Cryo Philips 6922 is quite amazing. This valve has always suffered from ... Sold Out £18.00
6C10/G.E CRYO GENERAL ELECTRIC CRYO VALVES This rare triple triode that finds itself used in a small number of Fender amplifiers. This valve ... In stock £35.00 Image coming soon
6C4/EC90/G.E-CRYO GENERAL ELECTRIC CRYO VALVES Special Cryo treated version of thel G.E item that was used by Conrad Jonson and many high end ... In stock £15.00 Image coming soon
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
6H30-EB/SOVTEK-CRYO Sovtek The Sovtek 6H30 Pi-EB is a remarkable audio valve which offers a very linear response.This is the ... In stock £26.00
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
6L6GC/SVETLANA / WINGED C CRYO SVETLANA/WINGED C CRYO VALVES The design of this valve has its roots in the famous Sylvania STR387. The valve features thick mica ... In stock £26.00

All prices contained on this page are exclusive of VAT.
This is currently charged at 17.5% and is payable by all EU countries.

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