Mullard Amperex 7189 EL84 6BQ5 KM1 Vintage 1972 NOS Tube Quad (very strong)

These Mullard tubes (branded for Amperex) feature 1972 date codes of "B2H4" and "B2F3". Construction consists of gray plates and a round getter.

Minimum Gm (70%) is 2.2 and NOS spec (100%) is 3.1. These tubes tested at 12.3, 11.2, 12.0, and 11.3. Plate current measured at 60.1, 50.0, 53.2, and 49.8mA (respectively).

TESTING: The tube(s) in this sale have been tested on an Amplitrex AT-1000 tube tester (fixed-bias mode), which is a laboratory-grade tester capable of supplying the user with precision measurements. It tests for heater-cathode leakage, gas, mutual conductance, and plate current. Please note that no tube testers are identical and my test results will likely differ slightly from yours.

Yes, it's that simple! I will not declare a lower value for any reason.

(12AX7, 12AY7, 6SN7, 6DJ8, etc). (6V6, 6L6, 6550, EL34, etc).

(eye tubes, Nixie tubes, CRTs, sockets, etc).