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Watford Valves was the first Company in the World to offer a cryogenically treated valve brand range showing huge commitment to the proven scientific cryogenic process.
The Harma Diamond deep cryogenically treated valve range offers the musician and audiophile valves which are not only specially selected and tested, but are cryogenically treated for the ultimate performance. We also offer a full range of cryogenically treated valves made by the great factories of the past, such as Mullard, Telefunken, Philips as well as modern brands such as Groove Tubes, Tube Amp Doctor, JJ Electronic (formally Tesla), Electro Harmonix and Sovtek. So whatever is your preferred make Watford Valves will have a cryogenically treated version in stock.
What are the benefits of using cryogenically treated Valves?
The cryogenic process offers permanent change to the metals microstructure. The reduction in electronic noise improves the valves noise floor leading to lower microphonics. Until now clear note definition, musical complexity and rich harmonic content was only attainable by using rare and expensive new old stock classics.
Many guitarists have found the dramatic effect cryogenic treatment has on the way the valve performs not only in clean applications but also when overdriven. The cryogenic process removes the harshness from the valves tone and imaging has more focus and bite. It has a warmer sound which is pleasing to listen to, providing a clear and musical distortion. In short, many musicians, engineers and audiophiles have found that by using cryogenically treated valves it is a proven way of obtaining NOS sound quality with a great difference, an affordable price!
We offer a full range of cryogenically treated valves Harma Diamond Cryogenically treated valve range- High quality at an affordable price.
Nick Guppy, amp reviewer for the UK GUITARIST magazine wrote
“Compared to NOS Telefunken, the Harma Cryo ECC83 offered an improvement in gain and high frequency response that noticeably enhanced this amps singing lead voice and lush clean sounds”.
- NameBrandCommentStockPrice PhotoOrder
- 5687WB-HARMA CRYOHarma Cryo Very Limited stock
These Harma 5687WB Cryo are USA made original military grade specification double triode in ...In stock£48.00
Buy Now - 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£36.00
Buy Now - 5881-HARMA MESA BOOGIE 400+ CRYO OUTPUT SETHarma Cryo Special Offer 20% Discount
Here is a special Cryo set for all you owners of the Mesa Boogie 400 plus bass head ...In stock£432.00
£345.60Buy Now
FREE UK
Mainland Delivery - 5881-HARMA MESA SELECT CRYOHarma Cryo Mesa Select for use in Mesa Boogies
Special Offer 15% Discount
The Harma 5881 Cryo is the button based ...In stock£36.00
£30.60Buy 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£36.00
Buy Now - 6111WA-PHILIPS CRYOPhilips ECG JAN CRYOOriginal USA made Philips Jan specification 6111WA Military grade super miniature valve that is the highest quality ...In stock£30.00
Buy Now - 6922/ E88CC-HARMA CRYO BALANCED PAIRSHarma Cryo The Harma 6922 Cryo treated valve is the best Military Russian 6922 type made and is the best that we have ever used in ...In stock£85.00
Buy Now - 6CG7/ 6FQ7-GENERAL ELECTRIC CRYOGeneral Electric Cryo GE 6CG7/6FQ7 has the classic GE sound stage which is big and open. These are original USA made valves are specially ...In stock£30.00
Buy Now - 6GK5/ 6FQ5-HARMA STR CRYOHarma Cryo These specially treated cryo 6GK5 offer the Conrad Johnson owners the ultimate performance. They provide a more ...In stock£20.00
Buy Now - 6L6GC-HARMA RETRO CRYOHarma Cryo The Harma 6L6GC Retro Cryo is a re issue of the famous Sylvania STR 387 that was produced for Fender in the early ...In stock£34.00
Buy 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£36.00Buy Now - 6L6GC-JJ TESLA CRYOJJ Tesla Cryo The JJ 6L6GC Cryo is the best sounding version of JJ 6L6GC valve available today. The Cryo treatment enhances the ...In stock£32.00
Buy Now - 6L6GC-SVETLANA WINGED C CRYOSvetlana Winged C Cryo The Original Svetlana Winged C 6L6GC that was designed based on the famous Sylvania STR 387 6L6GC and manufactured in ...In stock£
70.00
£63.00
Buy Now - 6L6GC-SVETLANA WINGED C MESA SELECT CRYOSvetlana Winged C Cryo Mesa Select for use in Mesa Boogies
This valve is specially selected to run in Mesa Boogies fixed bias ...In stock£75.00
£67.50Buy Now - 6N1P VI-HARMA CRYOHarma Cryo The Harma 6N1P VI Cryo is a cryogenically treated special long life, low noise selected version of the 6N1P. The valve ...In stock£22.00
Buy Now - 6N1P VI-HARMA CRYO BALANCED PAIRHarma Cryo Cryo Balanced Matched Pairs
The Harma 6N1P VI Cryo is a cryogenically treated is a special long life, low noise ...In stock£26.00Buy Now - 6V6GT STR-TAD CRYOTube Amp Doctor Cryo The TAD 6V6GT STR Cryo is a special Cryo treated version of the TAD 6V6GT STR.TAD have based this 6V6GT design on the ...In stock£36.00
Buy Now - 6V6GT-PHILIPS CRYOPhilips ECG JAN CRYOBlack Plate Cryo Version
Special Cryo treated version of the original American Military JAN 6V6GT which are ...In stock£55.00
Buy Now - 6V6GT-PHILIPS CRYO SINGLEPhilips ECG JAN CRYOBlack Plate Cryo Version
Single Valve
Special Cryo treated version of the original American Military JAN ...In stock£55.00Buy Now - 6V6GTS-JJ TESLA CRYOJJ Tesla Cryo The JJ Tesla 6V6GTS Cryo is a specially cryo treated version and is the best sounding version of JJ 6V6GTS valve.The ...In stock£40.00
Buy Now - 7199-PHILIPS CRYOPhilips ECG JAN CRYOVery Limited Stock
These are the real deal 7199 Philips made in the USA for the American military and have been ...In stock£95.00
Buy Now - 8254/ EC1000-MULLARD CRYOMullard Cryo Special Cryo Treated Version
Very special Cryo treated Mullard 8254 EC1000 for Neumann microphones. We have Cryo ...In stock£95.00
Buy 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£26.00
Buy 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 PAIRHarma 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
