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Mullard CV5358 6DJ8 ECC88 Military Tubes Matched Pair - Blackburn 1965 - NOS

Mullard CV5358 6DJ8 ECC88 Military Tubes Matched Pair - Blackburn 1965 - NOS

Regular price $205.00 USD
Regular price Sale price $205.00 USD
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Perfect matched pair of vintage Mullard CV5358 (Military version of ECC88) audio tubes - Made in Gt. Britain - 1965 - Extremely Rare

Note: Technically equivalent to 6DJ8/ECC88, the British military Mullard CV5358 tubes are the BEST choice if you want to hear even more refined version of the legendary Blackburn 6DJ8 sound.

Tube Summary

No other tubes can deliver vocals like the Blackburn Mullard tubes, from ECC88 to E88CC to E188CC every variant of these can make your audio system sing like an angel, and that's a fact. These ECC88's are extremely hard to find today and are becoming the darling of every serious audiophile.

Sound Characteristics

The overall tonality of Mullard ECC88 tubes is warm and lively with a very spacious sound stage. "Like a warm British jacket of the finest tweed, these glorious tubes have an attractive sweet warmth in their midrange and lower regions."  This is how the experts on describe the sound signature of British-made Mullard tubes. 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 the human voice, especially female voices, with haunting realism. The British-made Mullard tubes are also known to have an attractive sparkle at the top with rich we know where that "warm British jacket" comes from!

Recommended Sound Upgrade Path

With their superb military-grade performance, the next logical upgrade for CV5358 should only be military tubes: CV2492 a.k.a. the military E88CC. To learn more, please see our listing of a wonderful matched pair of 1964/66 Mullard CV2492 Tubes currently available. 

Professional Tube Testing

Both tubes tested Strong NOS (110%+ GM) on a Mercury 2000 tube tester with the following result (mutual conductance in uMhos):

Tube 1: 14,100/13,800 
Tube 2: 14,000/14,100

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 tube's ability to amplify sound, so the higher the numbers the stronger. 

Appearance & cosmetic condition

We treasure this pair also because of the pristine cosmetic condition - 100% of the paint is intact and the identical Blackburn factory date code is perfectly visible on both tubes:

B5H2 (B = Blackburn, 5 = 1965, H = October, 2 = 2nd week of the month)


The original military box (no Mullard logo - used for internal distribution) will be included for this pair of tubes. 

Shipping Policy 

- US Shipping: Flat-rate($5.50) USPS Ground Advantage for ALL states.

- International Shipping: Flat-rate ($20.00) USPS First Class International for ALL countries.

 - Orders ship within 24 - 48 hours
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