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Mullard 6SN7GT = VT-231 Smoke Glass Matched Pair - Tottenham, GB 1955 (J5C)

Mullard 6SN7GT = VT-231 Smoke Glass Matched Pair - Tottenham, GB 1955 (J5C)

Regular price $1,111.50 USD
Regular price Sale price $1,111.50 USD
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Soundlumia's Opinion

No other tubes can deliver vocals like the Mitcham Mullard's, and that's a fact. These 6SN7/VT-231 tubes, especially the vintage 1950s ones, are extremely hard to find today and are becoming every serious audiophile's darling.  

The overall tonality of Mullard 6SN7/VT-231 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!

Professional Tube Testing

Tube 1:

Measured transconductance(GM): 2.21/2.18 mA/V  - 85%/84% (100% = 2.60 mA/V)
Measured plate current(IA): 7.652/7.202 mA  - 85%/80% (100% = 9 mA)

Tube 2:

Measured transconductance(GM): 2.25/2.3 mA/V  - 87%/88% (100% = 2.60 mA/V)
Measured plate current(IA): 7.037/7.675 mA  - 78%/85% (100% = 9 mA)

NO shorts, leakage or gas. NO noise or microphonics.

Curve trace is also included in the original RoeTest report.

Appearance & cosmetic condition

This tube is in pristine cosmetic condition with nearly 100% of the paint and lettering well retained. The Blackburn date code etched on glass is also perfectly: 

JSC (J =  Tottenham, GB)


NEW Mullard reproduction tube boxes.
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