ECC83-HARMA RETRO CRYO Click on image(s) above to view larger

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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.
The Harma ECC83 Retro CRYO is a true sounding recreation of the famous Mullard ECC83.
Unlike many tube suppliers, we are not interested is a look alike copy we are interested in the sound.

The ECC83-Retro produces the warm detail and harmonically rich midrange that made the Mullard sound so famous. The valve has been designed to have a smooth harmonic slope which gives a warm crunch. The Cryo treatment gives greater depth and clarity to the valve sound, sweetening the highs and tightening the lows .The Cryo also adds a crisp bite to the valve making this the ideal choice to add crunch and punch to your sound.

Due to its warm smooth slope and the enhancement of the treble performance by the Cryo treatment the upper mid fizz from your distortion sound that is common in modern amplifiers is removed.

To reduce the microphonics the valve has extra thick mica spacers with a rigid anode construction. To further reduce microphonics the valve is made from extra thick glass with a 22mm diameter.
In manufacture special attention is paid to the stamping of the anode plates to ensure close balance between the triodes.

This Cryo valve provides glassy smooth highs with a more musical midrange than the untreated item, with the added bite that you need. This is the perfect valve to upgrade all ECC83/12AX7 types in all applications.



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