29.3.08

tube amp calculator

Common Tube Amp Calculations

Common Tube Amp Calculations




Voltage from Current and Resistance Power from Current and Impedence Plate Current for % Plate Dissipation
Current from Voltage and Resistance Power from Voltage and Impedence Plate Current & Power from Volts across OT
Resistance from Voltage and Current Power from Voltage and Current Plate & Screen Current from Cathode Voltage
Output Transformer Primary Impedence Calculation Bias Current Calulation from Torres Book
















































Voltage from Current and Resistance

Current: mA

Resistance: Ohms

Voltage Volts























































Current from Voltage and Resistance

Voltage: Volts

Resistance: Ohms

Current mA























































Resistance from Voltage and Current

Voltage:

Current: mA

Resistance Ohms























































Power from Voltage and Current

Voltage: Volts

Current: mA

Dissipation Watts




















































Power from Voltage and Impedence

Voltage: Volts

Impedence: ohms

Dissipation Watts




















































Power from Current and Impedence

Current: mA

Impedence: ohms

Dissipation Watts




















































Plate Current for Percentage of Plate Dissipation at Idle

Max Plate Dissipation: Watts

Desired Percent Plate Dissipation at Idle: %

Plate Voltage: Volts

Bias Current mA




















































Plate Current / Power from Voltage Across Output Transformer Primaries
Primary Winding DC Resitance (Measure with Amp OFF!)

Winding 1: ohms

Winding 2: ohms
Voltage Across Primary Windings at Idle (Amp on, Zero Volume)

Winding 1: Volts

Winding 2: Volts

Output Transformer Center Tap Voltage: Volts

Winding 1: Current mA Power Watts

Winding 2: Current mA Power Watts




















































Plate and Screen Current from Cathode Voltage and Screen Resistor

Cathode Resistor: Ohms

Cathode Voltage: Volts

Screen Resistor: Ohms

Voltage Across Screen Resistor:Volts

Plate Current mA

Screen Current mA




















































Bias Current Calculation From Torres Book
Class A Class AB High AB
Tube Type:
Plate Volts:
Calculate

Bias Current mA






























































Output Transformer Primary Impedence Calculation
Set Signal Generator for 1KHz at about 1VAC

Generator Output:VAC

Volts across secondary: VAC

Secondary Tap Value / Speaker ImpedenceOhms

Turns Ratio

Primary Impedence Ohms






























































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