Richard Kuehnel "Circuit Analysis of a Legendary Tube Amplifier:
 the Fender Bassman 5F6-A"

Pentode Press, Seattle,
2nd edition, 4th printing
© 2005 by Richard Kuehnel
ISBN 0-9769822-1-8

1. The 12AY7 Preamp (3)
Vacuum Tube Diodes and Perveance (3)
Cutoff Amplification Factor for Triodes (4)
Triode Small-Signal Model (5)
The 5F6-A Dual-Channel Preamp (7)
DC Operating Point and Load Line (8)
Graphical Estimation of Plate Resistance and Transkonductance (11)
AC Voltage Gain (12)
Cathode Impedance (15)
Output Impedance (18)
Miler Capacitance (19)
Frequency Response (#1 Inputs) (21)
The #2 Inputs (23)
Headroom (24)
12AY7 Preamp Test Results (26)
Summary of 12AY7 Preamp Formulas (27)
2. The 12AX7 Voltage Amp (29)
DC Operating Point and AC Characteristics (30)
AC Voltage Gain (32)
Negative Feedback (34)
Miller Capacitance (35)
Output Impedance (38)
Input Impedance and Frequency Response (39)
Input Characteristics - Simplified (41)
Headroom (43)
Summary of 12AX7 Voltage Amp Formulas (43)
3. The 12AX7 Cathode Follower (47)
DC Operating Point and AC Characteristics (47)
AC Voltage Gain (51)
Output Impedance (52)
Headroom (54)
Summary of 12AX7 Cathode Follower Formulas (54)
4. The Tone Stack (57)
A Convenient Low-Frequency Response Approximation (59)
Approximate High-Frequency Response (61)
Input and Output Impedance (63)
More Accurate Frequency Response Calculations (64)
Plots of Tone Stack Frequency Response (66)
Voltage Amp, Cathode Follower, and Tone Stack Test Results (74)
Summary of Tone Stack Formulas (77)
5. The Long-Tailed-Pair Phase Splitter (81)
DC Operating Point and AC Characteristics (82)
AC Voltage Gain - Simplified Model (86)
AC Voltage Gain - a More Accurate Model (90)
Input Impedance (93)
Feedback Gains & Feedback Input Impedance (96)
Headroom (99)
Phase Splitter Test Results (101)
Interaction with the Power Amplifier Input Circuit (103)
Summary of Phase Splitter Formulas (105)
6. The Push-Pull Power Amplifier (109)
Adjusting Published Curves to Different Screen Voltages (111)
Composite Characteristic Curves and Load Line (112)
Maximum Power Analysis (119)
Stress Limits on the GZ34 Rectifier (126)
Nonlinear Distotrion Analysis (129)
Open-Loop Harmonics (134)
The Effects of Negative Feedback - Linear Approximation (135)
The Effects of Negative Feedback - Nonlinear Model (136)
Graphing the Response with Negative Feedback (137)
Output Impedance (139)
Power Amplifier Test Results (142)
Summary of Power Amplifier Formulas (144)
7. Power Supply and System Analysis (147)
The Power Supply (148)
DC Voltages (149)
Power Supply Sag as a Function of Time (149)
A Convenient Approximation for Power Supply Response Time (154)
AC Ripple Attenuation (156)
Complete 5F6-A System Model (160)
System Headroom (163)
Closed-Loop Stability Tests (165)
8. The Marshall JTM45 (169)
Substituting a 12AX7 in the First Preamp (169)
Bright-Channel Boost (173)
Frequency Response - Simplified (176)
Effects of Increased Negative Feedback (178)
Power Supply Modifications (182)
Changes in Power Supply Response (184)
9. 12AY7, 12AX7, 6L6GC, and GZ34 Datasheets (187)
10. References (217)
11. Index (219)

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