A Modern Phono Amplifier

 

 

 

Paper Scratches for Complementary BivTriode Architecture

Some thinking during a funny/sunny riding-day with my city bike.

 

FeedBack Paper from Bell’s Harold Black

 

 

 

 

 

 

 

 

 

Lack of Complementarity Overcoming in BivTubes

 

The “genetic” of Vacuum Tubes seen as electron-only emitting/modulating devices cannot produce complementar pairs as happens in the Solid State World where we find gears such as npn/pnp, nmos/pmos, jnfet/jpfet…

All of this can be a very limiting problem with BiVtubes when we need to “mimic” standard Solid State architectures. For example Solid State Audio Power Amplifiers are architecturally simmetric, balanced, transformerless.

To overcome this limitiation we can use the well note Darlington/Sziklai pairs

 

Mutatis/Mutantis we can build the followin DartlingtonBivTriode/SziklaiBivTriode pairs

Fo example a complementar output stage could like as this

the Szikai pair can act also as simple current sink and in this case the grid of the tube is biased to a constant voltage.

Ready to run into the wild?

A 45s Dual Mono Push Pull Amplifier

45 Basics

 

 

 

12bh7 Basics

 

 

6SN7 Basics

 

Schematics

 

 

 

 

 

 

Part List

 

 

SWIII Simulations

Amplifier Simulation Deck (One Channel)

Maximum Rating Measures

power_6sn7_tube1: (v(p1_cross_up)-v(k1_cross_up))*i(rp1_cross_up)=0.354096 at 0
power_6sn7_tube2: (v(p2_cross_up)-v(k2_cross_up))*i(rp2_cross_up)=0.354095 at 0
power_6sn7_tube3: (v(vcross_coupled)-v(k1_cross_low))*i(rk1_cross_low)=1.0535 at 0
power_6sn7_tube4: (v(vcross_coupled)-v(k2_cross_low))*i(rk2_cross_low)=1.05351 at 0
power_12bh7_tube1: (v(p1_driver)-v(k1_driver))*i(rp1_driver)=-1.49176 at 0
power_12bh7_tube2: (v(p2_driver)-v(k2_driver))*i(rp2_driver)=-1.49176 at 0
power_45_tube2: (v(p2_45)-v(k2_45))*i(rk2_45)=-4.31046 at 0
power_45_tube1: (v(p1_45)-v(k1_45))*i(rk1_45)=4.31046 at 0
power_rsupply_driver: (v(vpp45)-v(vdriver))*i(rsupply_driver)=-0.324416 at 0
power_rsupply_cross_coupled: (v(vdriver)-v(vcross_coupled))*i(rsupply_cross_coupled)=-0.091649 at 0
power_rk1_cross_low: v(k1_cross_low)*i(rk1_cross_low)=0.0458239 at 0
power_rk2_cross_low: v(k2_cross_low)*i(rk2_cross_low)=0.0458249 at 0
power_rk2_cross_up: (v(k2_cross_up)-v(k2_cross_low))*i(rk2_cross_up)=0.0103597 at 0
power_rk1_cross_up: (v(k1_cross_up)-v(k1_cross_low))*i(rk1_cross_up)=0.0103601 at 0
power_rp1_cross_up: (v(vcross_coupled)-v(p1_cross_up))*i(rp1_cross_up)=0.343957 at 0
power_rp2_cross_up: (v(vcross_coupled)-v(p2_cross_up))*i(rp2_cross_up)=0.343942 at 0
power_rp1_driver: (v(vdriver)-v(p1_driver))*i(rp1_driver)=-0.916225 at 0
power_rp2_driver: (v(vdriver)-v(p2_driver))*i(rp2_driver)=-0.916225 at 0
cap_voltage1_cross: v(p1_cross_up)=122.803 at 0
cap_voltage2_cross: v(p2_cross_up)=122.806 at 0
cap_voltage1_driver: (v(p1_driver)-v(g1_45))=200.162 at 0
cap_voltage2_driver: (v(p2_driver)-v(g2_45))=200.162 at 0

FFT- Full Load

Total Harmonic Distortion

 

Fourier components of V(out)
DC component:0.111185

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 7.804e+00 1.000e+00 0.08° 0.00°
2 2.000e+03 1.610e-01 2.063e-02 -89.29° -89.38°
3 3.000e+03 6.226e-02 7.979e-03 0.37° 0.29°
4 4.000e+03 3.965e-02 5.081e-03 -89.85° -89.93°
5 5.000e+03 5.461e-02 6.998e-03 178.06° 177.98°
6 6.000e+03 3.933e-02 5.040e-03 87.51° 87.43°
7 7.000e+03 2.809e-02 3.600e-03 -1.47° -1.55°
8 8.000e+03 2.173e-02 2.784e-03 -90.74° -90.83°
9 9.000e+03 1.497e-02 1.918e-03 176.66° 176.58°
Total Harmonic Distortion: 2.477949%

 

Full Waves – Sinusoidal input

Heater Power Supplies Deck

Simulation Results: Rampup Time

 

HV Power Supply Simulation Deck

 

Simulation Results: Rampup Time

Negative Bias Power Supply Deck

Simulation Results