VINTAGE VACUUM TUBE ECC83 / 12AX7 ADZAM
made by MBLE (Philips) Belgium
used tube, tested good
How I test vacuum tubes
1) no shorts and emission = good on basic emission tester
2) measurement of gm with custom built tester , using settings of AVO tube tester and grid shift method
For this tube : Va = 250 V, Vg1 = - 2 V
Test result :
triode 1 : Ia = 1 mA , calculated gm = 1.5 mA/V
triode 2 : Ia = 1 mA, calculated gm = 1.7 mA/V
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