CV492 ECC83 12AX7 Brimar KB/FD grey Plate Used Old Stock Valve Tube Code 4A0/1573 1960 1573 = designation code for brimar cv492/CV4004 Hickok gm 1600/1750 mhos gm
eBay
CV492 ECC83 12AX7 Brimar KB/FD grey Plate Used Old Stock Valve Tube Code 4A0/1573 BK600 = 89/92 New 89 up Hickok test 1850/2000 mhos GM
eBay
SLANTED SQUARE D GETTER. AUDIO VACUUM TUBE. reserve the right to assess. MINIMUM GOOD = 60. you encounter any issues with. you encounter any issues. look forward to serving you. (FUN FACT - THE SENCORE MIGHTY MITE IS SAID TO BE ONE OF THE BEST TESTERS EVER MADE FOR GRID LEAKAGE TESTING).
eBay
It’s been said that the Mullard sound can be most likened to a warm British jacket of the finest tweed. And I like how Mullard tubes sound, too. Enticingly intimate and warm, almost sweetly so, it’s always a close, handsy dance when listening to a Mullard.
eBay
I61 B2A4 Code in the Glass. Mullard Blackburn, Made in Great Britain. 12AX7 ECC83 Valve Tube. Short Ladder Plates, Halo Getter.
eBay
Date Code: mC2 D8B. 1x Mullard ECC83 Valve. Manufactured by VALVO. This valve has also been tested in amplifier without any noise. Tested by AVO VCM Tester. NOS specification: Ia = 1.2(mA), gm = 1.6(mA/V).
eBay
It’s been said that the Mullard sound can be most likened to a warm British jacket of the finest tweed. And I like how Mullard tubes sound, too. Enticingly intimate and warm, almost sweetly so, it’s always a close, handsy dance when listening to a Mullard.
eBay
They feature a 1964 date code of "B4H2" with gray plates and a round getter. Both are test well and above the minimum. Audio Preamp Tubes (12AX7, 12AY7, 6SN7, 6DJ8, etc). It tests for heater-cathode leakage, gas, mutual conductance, and plate current.
eBay