Mullard CV4003 (Military 12AU7) Box Plate Tubes - Paired and Balanced - Mitcham Gt. Britain

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This listing is for a set of lightly used and balanced Mullard CV4003 tubes.

This tube type is a special military version of the 12AU7 featuring box plates and halo getters.

This set was previously tested and labeled by upscale audio.

We confirmed the test results with our calibrated modern and professional tube tested (Amplitrex AT1000). Both tubes still test strong with very good microphonic performance.

These tubes both have very good emission and Gm balance between triode sections (within 5%), which makes them ideal for use in circuits that require balanced tubes.

Condition Note: Boxes show shelf wear. One box is missing a top tab.

Date Codes Matched:
631
R1L2 - Mitcham

AT1000 Test Results
Format: Emission % of NOS / Gm % of NOS

Tube 1
Triode 1: 99 / 95
Triode 2: 100 / 100

Tube 2
Triode 1: 95 / 95
Triode 2 91 / 90