Feliks Audio Bliss Balanced Electrostatic Headphone Amplifier

Fully balanced pure class-A powered by 300B tubes, designed to drive any electrostatic headphones. Handcrafted in Poland

The Feliks Audio Bliss is the result of over four years of research, development, and extensive testing and listening. This fully balanced electrostatic tube headphone amplifier was built to drive any electrostatic headphone, no matter the required bias voltage. 

The Bliss features four 6E5P tubes in a push-pull, pure class-A configuration, as well as four EL34 and four 300B power tubes, forming a cascoded differential amplifier. A manually adjustable bias voltage from 120 V to 720 V ensures great flexibility, and there are two headphone sockets, one dubbed PRO (5-pin) and the other NORMAL (6-pin). 

The NOS 6E5P tubes in the driver stage work as triodes, providing exceptionally high voltage gain. The premium Stradi S300B tubes offer ultimate reliability and sonic performance. Other high-quality components are from brands such as Vishay, Dale, Nichicon, and Jantzen. The volume control uses a 24-level high-quality DACT stepped attenuator.

The Bliss is of premium construction, hand-crafted in Poland, and comes in beautiful solid wood options.

Features

• Class-A topology with 6E5P driver tubes in a push-pull configuration
• Power stage forming a Hedge topology using EL34 and 300B tubes
• Low internal operating temperature that helps maintain working parameters and stable operation despite the device’s high power
• Point-to-point soldering of critical components to minimize noise and interference
• High-quality Lundahl transformers and a DACT stepped attenuator to reduce channel imbalance, lower distortion, and improve sonic quality
• Carefully optimized signal routing and component layout to ensure minimal interference and an exceptionally clean internal structure
• Three-year extended warranty for the amplifier
• Six-month warranty for the tubes

In the Box

• Bliss Electrostatic Headphone Amplifier
• 4 x 6E5P tubes
• 4 x 300B tubes
• 4 x EL34 tubes
• AC Power Cord
• User Manual
• Warranty Card

Specifications

Driver Tubes: 4 x 6E5P

Power Tubes: 4 x 300B, 4 x EL34

Electrostatic Headphone Bias (PRO, Normal): 240 V–720 V, 120 V–360 V

Input Sensitivity: 2 V / 4 V

Maximum Output Voltage: 520 V RMS 

Attenuator: 24-position high-quality DACT stepped attenuator

Input Impedance: 10k ohm (RCA) / 10k ohm (XLR)

Gain: ~250x

Inputs: 2 x stereo RCA, 1 x stereo XLR

Electrostatic Headphone Outputs: PRO ONLY 5-pin (580 V bias)
NORMAL 6-pin (230 V bias)

Power Consumption: 250 W

Dimensions (WHD): 18.5" x 18.5" x 11.6" (47 x 47 x 29.5 cm)

Weight: 57.3 lb. (26 kg)