TUBA Headphone Amplifier
3
Description
The TUBA is a world-class vacuum tube headphone amplifier designed to operate with
either low impedance (Grado) or high impedance (Sennheiser) headphones. The power
stage is a single-ended parafeed EL84 triode into an impedance matching transformer,
offering very low distortion and huge signal headroom. An internal switching power
supply boosts the 15Vdc input by a factor of ten for B+, after a 30 second warm up
delay. The amplifier is conveniently turned on and off by pressing the volume knob
inwards.
Specifications
Item
Specification
Sensitivity
3.5Vrms
Input Impedance
50k ohm
Output Impedance
5/35 ohm (LO/HI)
Bandwidth
10Hz to 150kHz
Output Power
350mW @ 32 ohm
Gain
6dB (HI)
Output Voltage
7Vrms @ 1% distortion
Size
6 x 10 x 3.5 inches
Power
15Vdc @ 1.35A
