Original Audio OPA-5A: Tube amplifier with Bluetooth

Original Audio offers the OPA-5A , a Class A amplifier and headphone amplifier duo based on a tube architecture that delivers highly musical and rich sound. It uses two 12AU7 tubes for the preamp stage and two KT88 tubes for the Class A amplifier circuit.

The entire device has a very good design quality. Its power stage includes two EI transformers and a Japanese Z11 transformer to provide the audio circuits with a clean and stable electrical signal.

For connectivity, the OPA-5A offers unbalanced stereo RCA and balanced stereo XLR inputs, as well as Bluetooth wireless connectivity, allowing you to stream music remotely, such as from a smartphone. The outputs have terminals for connecting speakers, as well as two headphone outputs, the first is an unbalanced 6.35 mm jack, the second is a balanced XLR 4 pole.

Characteristics of Original Audio OPA-5A:

• Product Type: Tube Amplifier/Headphone Amplifier
• Inputs: Bluetooth/1x single-ended RCA stereo/1x balanced XLR stereo
• Outputs: Speaker terminals/1x 6.35mm Jack single-ended headphone output/1x XLR 4 balanced headphone output
• Tubes: 2x 12AU7/2x KT88
• Output Power: 2x 8W @ 4-8 ohms
• Headphone Output Power: Balanced: 2x 4500 mW @ 32 Ohms / Single Ended: 2x 1600 mW @ 32 Ohms
• Frequency response: 20Hz~50kHz (-1.5dB)
• THD: 0.5% (1 kHz)
• SNR: 90 dB
• Input sensitivity: 350 mV
• Input impedance: 100k ohms
• Channel balance: 0.5 dB
• Dimensions: 385 x 290 x 175 mm

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