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

Please look at our other items, we combine shipping.

For shipping to France , Mondial Relay pickup point (not to your home address) is possible for 9 EUR. contact before payment if you want this shipping option