Ampera
6528
Triode · IHT · Octal · 1960
“High-current OTL output.”
Power triode delivering 30W for push-pull and SET designs
GAIN FACTOR0
PLATE IMPEDANCE0Ω
TRANSCONDUCTANCE0mA/V
Cgk0pF
Cgp0pF
Cpk0pF
GAIN5%
POWER75%
DRIVE99%
LINEARITY95%
EXECUTIVE SUMMARY
The 6528 is a indirectly-heated triode from Tung-Sol, introduced around 1960. It provides a gain factor (μ) of 5 with 710Ω plate resistance. Commonly used in otl applications. High-current OTL output.
APPLICATIONS
SET outputPush-pull outputHeadphone output
Generic triode otl stage
• Headphone amp• PA/public address
HISTORY
Introduced1960ManufacturerTung-SolEquivalentsNone
Late ProductionSPECIFICATIONS
Heater Voltage6.3V
Heater Current5A
Max Plate Voltage500V
Max Power30W
Sensitivity7 mA/V
Gain Factor5
Internal Impedance710Ω
PinoutOctal
Era1960
RaritySought-after
Input Capacitance10pF
Miller Capacitance1.5pF
Output Capacitance6pF
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.