Two pairs of ECC83 tubes for sale, strong tubes, Mulard production in England, with I63 and B codes B901, B8B3, B784...
Early 60s...
The price is for one pair, please indicate which one you are interested in when purchasing, checked with L3-3 tester and Utracer 6 tester, details in the description.


Please inquire about the current postage costs before purchasing!


1:
SECTION 1
 
Test conditions:
Va  : 250 (V)                Swing +/- 25 V (10%)
Vg  : -2 (V)                 Swing +/- 0,2 V (10%)
 
Test results:
Ia  : 1,35 (mA)              112 % of nominal 1,2 (mA)           
Ra  : 51,48 (kohm)                                              Ra = dVa/dIa
Gm  : 1,93 (mA/V)            121 % of nominal 1,6 (mA)          Gm = dIa/dVg
mu  : 100 (-)                                                   mu = Gm*Ra
 
 
SECTION 2
 
Test conditions:
Va  : 250 (V)                Swing +/- 25 V (10%)
Vg  : -2 (V)                 Swing +/- 0,2 V (10%)
 
Test results:
Ia  : 1,25 (mA)              104 % of nominal 1,2 (mA)           
Ra  : 53,11 (kohm)                                              Ra = dVa/dIa
Gm  : 1,91 (mA/V)            120 % of nominal 1,6 (mA/V)        Gm = dIa/dVg
mu  : 102 (-)    

SECTION 1
 
Test conditions:
Va  : 250 (V)                Swing +/- 25 V (10%)
Vg  : -2 (V)                 Swing +/- 0,2 V (10%)
 
Test results:
Ia  : 1,36 (mA)              114 % of nominal 1,2 (mA)           
Ra  : 51,52 (kohm)                                              Ra = dVa/dIa
Gm  : 1,92 (mA/V)            120 % of nominal 1,6 (mA)          Gm = dIa/dVg
mu  : 99 (-)                                                    mu = Gm*Ra
 
 
SECTION 2
 
Test conditions:
Va  : 250 (V)                Swing +/- 25 V (10%)
Vg  : -2 (V)                 Swing +/- 0,2 V (10%)
 
Test results:
Ia  : 1,25 (mA)              104 % of nominal 1,2 (mA)           
Ra  : 55,82 (kohm)                                              Ra = dVa/dIa
Gm  : 1,89 (mA/V)            109 % of nominal 1,6 (mA/V)        Gm = dIa/dVg
mu  : 98 (-)

2:
SECTION 1
 
Test conditions:
Va  : 250 (V)                Swing +/- 25 V (10%)
Vg  : -2 (V)                 Swing +/- 0,2 V (10%)
 
Test results:
Ia  : 1,58 (mA)              132 % of nominal 1,2 (mA)           
Ra  : 47,87 (kohm)                                              Ra = dVa/dIa
Gm  : 1,96 (mA/V)            122 % of nominal 1,6 (mA)          Gm = dIa/dVg
mu  : 94 (-)                                                    mu = Gm*Ra
 
 
SECTION 2
 
Test conditions:
Va  : 250 (V)                Swing +/- 25 V (10%)
Vg  : -2 (V)                 Swing +/- 0,2 V (10%)
 
Test results:
Ia  : 1,43 (mA)              119 % of nominal 1,2 (mA)           
Ra  : 47,88 (kohm)                                              Ra = dVa/dIa
Gm  : 1,97 (mA/V)            123 % of nominal 1,6 (mA/V)        Gm = dIa/dVg
mu  : 94 (-)       

SECTION 1
 
Test conditions:
Va  : 250 (V)                Swing +/- 25 V (10%)
Vg  : -2 (V)                 Swing +/- 0,2 V (10%)
 
Test results:
Ia  : 1,59 (mA)              133 % of nominal 1,2 (mA)           
Ra  : 50,54 (kohm)                                              Ra = dVa/dIa
Gm  : 2 (mA/V)               125 % of nominal 1,6 (mA)          Gm = dIa/dVg
mu  : 101 (-)                                                   mu = Gm*Ra
 
 
SECTION 2
 
Test conditions:
Va  : 250 (V)                Swing +/- 25 V (10%)
Vg  : -2 (V)                 Swing +/- 0,2 V (10%)
 
Test results:
Ia  : 1,42 (mA)              119 % of nominal 1,2 (mA)           
Ra  : 50,53 (kohm)                                              Ra = dVa/dIa
Gm  : 1,97 (mA/V)            123 % of nominal 1,6 (mA/V)        Gm = dIa/dVg
mu  : 99 (-)                                                    mu = Gm*Ra