HK THE TUBE WORLD MONTHLY on Mar. 2018:The Perfect Upgraded 845 tubes COSSOR 845

The Perfect Upgraded 845 tubes

COSSOR 845

.....pure female and male voice stretch from medium frequency to low frequency, replenishing double bass and the drum set. 845, cheap as it is, can be necessarily good due to its great performance. However, COSSOR 845 is even greater than that. The sound, full of thickness, power and dynamism, did never perform loosely even when rebroadcasting mass drum record......


Some loudspeakers with a power up to 90 dB turned out to be consuming. In this sense, High-voltage triodes are in request to successfully achieve the balance. COSSOR 845 can be one of the good choices.

Domestically-produced high-voltage triodes, the best partner of loudspeakers
   Recent years have seen a higher quality of high-voltage triodes in China,as well as the fairer prices of them. Thus, users have their frequently-used EL34,KT88 tubes replaced by it used in ALTEC, JBL, TANNOY, which brings a better re-broadcasting effect. That is to say, the high-voltage tubes have been operated in such a high-voltage condition, due to which they should, without exception, be higher-crafted and assembled with greater materials to ensure the stability. This is the reason why included high-voltage tubes are all reliable and durable. 
   That being said, for high-voltage tubes, with output supply up to 20-30 watt, the fairness and purity in tune should can only be realized with a strong backing power derived from the high-quality amps themselves. Also, the high-voltage triodes have played pivotal role. The best case would be a combination of amps with antique tubes, of which the high price are not what general customers can afford. Fortunately, there have been not a few great works domestically in recent years. And COSSOR 845 can be the one of the cheapest price yet delivering the greatest performance.
   
Return of Time-honored UK COSSOR 
  COSSOR old players should be very familiar with COSSOR where vacuum tubes under GEC, OSRAM or other UK famous brands have been produced under commission, a proof of COSSOR’s good craftsmanship. And 52 KU can be the hottest under the category of U52 rectifiers and has been treasured by many antique tube users. Recently returned COSSOR has collaborated with PSVANE and rolled out a new series of vacuum tubes, among which the vanguard was COSSOR 845. 

Large glass shield, specific coating, greater sound effect
  Take COSSOR 845 from the box, you will find that the glass shield is relatively bigger than the 845, which can, as told the the rule the thumb, rise up sound effect. The black material coated in the internal layer also speed up the heat conduction, enabling a greater sound effect. Users can only notice the bright filament on the top of the tube, yet lost in stark darkness when they took a close look along “sweet spots”, which enables them stay outside the music. 
   Moreover, as revealed, the manufacturer has taken full consideration the damping coefficient, welding position, material and capacities to continuously upgrade COSSOR, in the hope of effecting its greatest performance in both dynamic and static operation.   

A sound full of richness and vitality 
  The loudspeaker for reference in the testing room-- ALTEC 604E Big Red is a symbolic high-power “treasure” loudspeaker and the one used to be pushed by single-ended 845 MELODY M845, and sometimes by higher-priced antique tube RCA 845. But when it comes to burn-in phase or connecting with new loudspeakers, there is no choice but to use the attached tube. However, when I got to know COSSOR 845, I had the attached tube replaced immediately ever since. I use it almost everyday, for its excellent performance adds a lot of interest to my seemingly dull music burn-in practice. 
  The deficiency of purity and details in sound is generally viewed as a flaw of high-voltage triodes, yet which is not true of COSSOR 845. Never did I use such a cheap tube which plays out the sound full of richness, and this feature was particularly evident when replaying the human voice. Pure female and male voice stretch from medium frequency to low frequency, replenishing double bass and the drum set. 845, cheap as it is, can be necessarily good due to its great performance. However, COSSOR 845 is even greater than that. The sound, full of thickness, power and dynamism, did never perform loosely even when rebroadcasting mass drum record.
  The great performance in medium and low frequency and following greater flexibility in high frequency when in combination mean a lot to high-voltage triodes as they back trump or coaxial horn, and the softness it effects in high frequency makes it possible the longer fair sound span. Moreover, the sense of texture in the high frequency has made for the purity and delight in sound.

Conclusion     
  Should COSSOR 845 be tested by stricter standard, it is expected to create a grander sound stage and greater stretching to sweet spots in low frequency, more bright in high frequency. It is supposed that only high-end tubes even the top ones are able to produce the features.But COSSOR 845, a high-voltage triode and a cheap entry level has displayed a far greater sound unmatched by attached tubes so that triode users can appreciate the same greatness as they did with 845 tubes. COSSOR 845 can be an excellent product in view of its great cost performance. 

COSSOR power tube                               selling price: RMB 1,980/ pair
                                                           Agent: WEI WEI Audio 
                                                           Tel: 9081 4562