a tube primer for guitar and bass players - Guitar Amplifier Blueprinting
a tube primer for guitar and bass players - Guitar Amplifier Blueprinting
a tube primer for guitar and bass players - Guitar Amplifier Blueprinting
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
B+ BIAS mA TC (gm)<br />
DATE TUBE<br />
volts volts actual actual gp Gain Comments<br />
Expected 1.2 1600 100<br />
10/15/2003 12AX7B Chinese 250 -2 0.8 1150 0.013 88.46 Construction visually looks the same as older<br />
1.5dB greater noise on average than<br />
0.9 1300 0.014 92.86 12AX7WA/G<br />
1.2 1670 0.019 87.89 Wider current QA spread than new 12AX7WA/G<br />
0.9 1510 0.016 94.38 Wide plate resistance specs. Quality declined<br />
0.8 1270 0.014 90.71 Wide TC specs - quality declined<br />
1.0 1530 0.017 90.00 Lower percentages of matched triodes A/B side<br />
Quality overall has dropped over all previous<br />
0.7 1210 0.013 93.08 runs<br />
Current output down 10%-15% over previous<br />
1.0 1460 0.016 91.25 runs<br />
Still better gain than 12AX7R/G 12AX7R2<br />
0.8 1360 0.015 90.67 12AX7R3<br />
0.9 1440 0.016 90.00<br />
Output TC Gain<br />
Averages 0.9 1390 90.93
Change language