High Fidelity Techniques * CDROM * PDF * Audio Techniques

Description

High Fidelity Techniques
by Langham
Gernsback Library (1950)
in Adobe PDF format on CDROM
114
pages - excellent reading
Contents:
CHAPTER 1... DISTORTION
Percentage of distortion. Speaker distortion. Transient distortion. Pickup, record, and stylus distortion. Amplifier distortion. Power output versus percentage of distortion. Distortion in output stage. Harmonics. Second harmonic distortion. Third harmonic distortion. Transformer distortion. Overloading. Square wave generator. Transients. Testing with square waves. Intermodulation. Improving linearity. Phase distortion.
CHAPTER 2... SPEAKERS AND BAFFLES
Speaker impedance. Acoustic impedance. Tuned boxes. Flat baffies. Helmholtz resonator. Speaker resonance. Infinite haffle. Box resonance. Tuned box design. Box padding. Labyrinth. Frequency versus wavelength. Minimizing speaker resonance. Multispeaker installations. Dual systems. Divided presence. Horns. Horn design. Crossover networks. Constant-impedance network. M-derived network. Crossover network design. Bass horns. Phasing. Folded horns. Speaker phasing.
CHAPTER 3 ... POWER AMPLIFIERS
Power output. Power output requirements. Output transformers. Testing transformers. Transformer bass response. Transformer primary inductance and leakage reactance. Equivalent transformer circuit. Output tubes. Low-mu triodes. Maximum power transfer. Speaker damping. Beam power tubes. Cathode loading. Beam tube amplifier. Class A. Class AB. Phase inversion. Standard phase inverter. Floating inverter. Split load inverter. Cathode coupled inverter. Push-pull crystal pickup. Self bias. Fixed bias. Back bias. Amplifier fusing. Direct-coupled amplifier.
CHAPTER 4 ... AMPLIFIER DESIGN
Inverse feedback. Feedback loop. Percentage feedback. Calculating feedback. Gain reduction factor. Positive feedback. Voltage feedback. Current feedhack. Balancing output tubes. Variable bias. Variable drive. Variable bias and drive. Plate resistance. Transconductance. Amplification factor. Plate load resistance. Load line. Tube distortion. Cathode bypass. Volume expansion. AB-triode amplifier. Cathode follower. Contact bias. Frequency limits. Time constants. Bass cutoff. Tube impedance. Tube capacitance. Miller effect. Calculation of Miller effect. Motorboating. Tone controls. High-cut control. Low-cut control. Frequency boosting with inverse feedback. Tuned-circuit tone control. Shielding. Bass booster. Bass and treble booster. Fixed booster. Variable booster. Tone-correction circuit placement. Amount of boost. Scratch filters. Selecting and handling records. Equalization. Oscillation. Hum. Grounds. D. C. filament supply. Soldering. Lacing and cabling.
CHAPTER 5... POWER SUPPLIES
Bleeders. Filtering. Series electrolytics. Output voltage adjustment. VR tubes. VR tube oscillation. Electronic regulation. Electronic regulated power supply circuits. Operation of regulated supplies. Control tubes.
CHAPTER 6... PHONOGRAPHS
Shellac records. Vinylite records. L.P. records. Record noise. Buying records. Pickups. Pickup arm. Variable reluctance pickup. Crystal pickup. Magnetic pickup. Stylus. Pickup resonance.
Q of pickup arm. Arm resonance. Weight of pickup arm. Types of styli.  Motors. Record brushes. Record changers. Adjusting record changers.
CHAPTER 7... SOME LAST WORDS ABOUT HIGH FIDELITY
Frequency range. Tone balance. High and low cutoff.
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