12AU7/ECC82 PROBABLY PHILIPS


Tube tested with uTracer3 by professional lab. Gives excellent current/transconductance readings (>80%) for both sections.


THIS SALES IS FOR THE TUBE IN PHOTO

Tube #053

SECTION 1
 
Test conditions:
Va  : 254 (V)                Swing +/- 25.4 V (10%)
Vg  : -8.5 (V)               Swing +/- 0.85 V (10%)
 
Test results:
Ia  : 8.52 (mA)              81 % of nominal 10.5 (mA)           
Ra  : 9.57 (kohm)            124 % of nominal 7.7 (kohm)        Ra = dVa/dIa
Gm  : 1.72 (mA/V)            78 % of nominal 2.2 (mA)           Gm = dIa/dVg
mu  : 16 (-)                 97 % of nominal 17 (-)             mu = Gm*Ra
 
 
SECTION 2
 
Test conditions:
Va  : 253 (V)                Swing +/- 25.3 V (10%)
Vg  : -8.5 (V)               Swing +/- 0.85 V (10%)
 
Test results:
Ia  : 8.74 (mA)              83 % of nominal 10.5 (mA)           
Ra  : 9.86 (kohm)            128 % of nominal 7.7 (kohm)        Ra = dVa/dIa
Gm  : 1.63 (mA/V)            74 % of nominal 2.2 (mA/V)         Gm = dIa/dVg
mu  : 16 (-)                 95 % of nominal 17 (-)             mu = Gm*Ra
 
 

Please note! I have a large amount of new and used vintage tubes. If you are looking for something in particular check this list 
https://shorturl.at/vwxDP