Before we get into the details of sound quality, let's be sure we are not talking about the regular Mullard E88CC tubes, but the very rare CV2492 military-grade tubes approved and tested by the British government, a HUGE upgrade from the garden variety. Like a warm British jacket of the finest tweed, these glorious tubes have an attractive sweet warmth in their midrange and lower regions. The top end is silky and pleasant and doesn't get rolled off. They retain a fine sense of "air" at the top, and the upper midrange is smooth and liquid.
These tubes reproduce human voice, especially female voices, with haunting realism. Full disclosure from your peer audiophile: Mitcham E88CC's are my go-to tubes for listening to Maria Callas and Frank Sinatra and I refuse to use other tubes.
Mitcham Mullard's are also known to have an attractive sparkle at the top with rich bass... Now we know where that "warm British jacket" comes from! "CV2492" is not just a label but a proud statement of British military-grade quality.The richness of the music reproduced by these tubes surpass any other previous attempt of any other Mullard E88CC's ever made. These are extremely low noise tubes, very neutral with pin-point tonal accuracy, providing an outstanding balanced and uncolored sonic tapestry that will put your mind in a whole new dimension. The cherry on top for this pair: the 1964 tube has blue tip, which means it had gone through rigorous screening process and was selected to be used in mission-critical military or medical devices.
The sonic differences (for the better) you are getting from the blue tip are enhanced clarity/details and extremely low noise think the requirements of military communication equipment. We treasure this pair also because of the great cosmetic condition of both tubes (clear inscription and clear date codes), which is amazing given the tubes' age.Mitcham factory date codes etched on glass are perfectly visible. Tube 1(Left) - 7L1 R4I1 (7L1 = change code, R = Mitcham, 4 = 1964, I = Oct, 1 = the 1st week of the month). 7L1 R6F2 (7L1 = change code, R = Mitcham, 6 = 1966, F = June, 2 = the 2nd week of the month). The pair worked wonderfully and sounded terrific in our professional studio setup for monitoring. Input: Cambridge Audio CXC V2 dedicated CD transport + Schiit Audio Bifrost 2 Multibit DAC. Amplification: Liquid Platinum Tube Amplifier by Alex Cavalli. Our full tube sound review was written 100% based on the actual listening experience while this pair of tubes were running in the system described above. Both tubes tested Super Strong NOS 120%+ nominal.
On a Mercury 2000 tube tester with the following result mutual conductance in. Tube 1: 15,100/14,500. Tube 2: 14,100/14,800. Good tubes start at 7000 and new tubes incl. NOS/NIB 12,500 - 13,000, and the Mercury 2000's rated mutual conductance (nominal) for new tubes is 12,500.Test result can also be seen in the pictures. In case you wonder what all these numbers mean to your sound experience, it's actually quite straightforward: mutual conductance directly translates to.
A tube's ability to amplify sound. So the higher the numbers the stronger.O short or gas grid leakage. Soundlumia sets extremely high quality standard for the products we deliver.
Sound experience is a very subjective thing, and let's be real it's not that easy to run into compatibility issues between amps and tubes so that one won't fly, either. Secondly, if you are a tube roller looking to game the return system, Number One STOP. We have seen it all and we know what you're up to.