I understand. So you want to know what a capacitor does in the amp and what a resistor does in the amp, and stuff along the lines of that, correct? If so, maybe you should check out his book "Vacuum Tube Guitar and Bass Amplifier Repair" by Tino Zottola.
Here's the contents.
1. Foreword
2. History of Vacuum Tubes
3. Vacuum Tube Operation: Edison effect, triodes, tube characteristics, biasing, modes of operation, rectifiers, triode amps, phase inverters, Class A amps, Class AB & B amps and oscillators
4. Amplifier Topology
5. Amplifier Tonal Characteristics
6. Amplifier Chassis Layout
7. Bibliography
8. APPENDIX A: Resistor Code
9. APPENDIX B: Capacitor Code
10. APPENDIX C: Wire Gauge Table
11. APPENDIX D: Musical versus Frequency Table
12. APPENDIX E: Vacuum Tube Data
13. British versus American terminology