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Black chassis stereo hybrid tube amplifier with four exposed vacuum tubes on top

Monoprice Inc.

Monoprice Inc. 138360 Stereo Hybrid Tube Amplifier 25W 2019 Edition video accessory

SKU CH-HZF3-AMB5K

A 25-watt hybrid tube amplifier with Bluetooth, RCA, optical, coaxial and USB inputs plus a subwoofer output

  • Product typeAmplifier
  • Product weight10.23
  • Key featuresHybrid amplication: The Monoprice tube amplifier utilizing t
  • Warm tube sound from 6N1 and 6P1 preamp tubes paired with 25-watt class AB power
  • Stream music wirelessly from up to 32 feet away via Bluetooth connectivity
  • Connect multiple sources using RCA, optical, coaxial and USB inputs
  • Add a powered subwoofer through the dedicated subwoofer output for deeper bass
  • Compact 10.23 kg chassis with exposed tubes fits desktop or living-room setups

25-Watt Hybrid Tube Amplifier

The Monoprice 138360 combines a tube preamplifier stage using two 6N1 and two 6P1 tubes with a 25-watt Class AB power section. It is designed for listeners who want the warmth of tube sound with enough power to drive typical bookshelf or floor-standing speakers in a home setting.

Bluetooth Range and Input Limits

Wireless streaming works up to 32 feet from the source device, so the amplifier must remain within that radius for a stable connection. Wired inputs include RCA, optical, coaxial, and USB, but the unit has no HDMI, phono preamp, or multi-channel decoding, limiting use with turntables or modern surround processors.

Compatibility Checklist

Verify that your speakers accept a 25-watt stereo signal and present a suitable impedance for a Class AB output stage. Ensure your source equipment provides RCA, optical, coaxial, or USB audio outputs, or supports Bluetooth audio streaming. The amplifier weighs 10.23 units and requires adequate ventilation space for the exposed tubes.

How it compares

Measured against everything we stock in AV Accessories & Components, at today’s prices. Recalculated every night.

Price $111.99
Pricier than about 77% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameMonoprice
Model name138360
Part number138360
Product typeAmplifier

Questions about this item

How do I decide between the Bluetooth and wired inputs on the 138360?

Use Bluetooth for wireless streaming up to 32 feet from a phone or tablet; switch to RCA, optical, coaxial or USB when you want a direct cable connection from a TV, computer or disc player.

What does the 25‑watt rating mean for everyday listening?

The hybrid design uses two 6N1 and two 6P1 tubes in the preamp stage and a 25‑watt class AB power stage, giving warm tube character with enough power for typical bookshelf or floor‑standing speakers in a living‑room or office.

Which digital interface should I use — optical, coaxial or USB?

Optical and coaxial both carry stereo PCM from a TV or streamer; USB lets you connect a computer directly. All three feed the same internal DAC, so choose whichever output your source provides.

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