TAGA Harmony
Hybrid Amplifiers

HTA-25B (2021) Print

Awards and Reviews
Questions & Answers

HTA-25B is a 25W / 4Ω high-fidelity but still affordable hybrid integrated amplifier utilizing four high quality tubes (depending on the option: 2 x 6P1 and 2 x 6N1, or 2 x 6H1N and 2 x 6N1N-EB) in the preamp section and transistors at the output. 

NEW FEATURES (2021 version)

  • Preamplifier ouput - dedicated for an optional external power amplifier or powered subwoofer and speakers. 
  • Aluminum side panels – to provide even more chic and timeless looks.


  • Bluetooth® - to wirelessly stream music from smartphones, tablets or computers.
  • Class A/B hybrid design utilizing vacuum tubes in the preamp section and transistors in the output to ensure a very warm, linear and lifelike sound with high dynamic presentation.
  • Sleek aluminum front and side panels design suitable for most interiors.
  • Ceramic tube sockets to get the most of the tubes.
  • 120W toroidal power transformer provides large amounts of clean power, high voltage stability and very
    low AC ripple current. This reflects in higher dynamics and extra pure energy and greater abilities to properly drive different range of speakers.
  • Headphone output for those who prefer discrete listening.
  • USB input - to quickly and easily play music from a USB flash drive (supports APE, FLAC, MP3, WAV files).
  • 2 analog inputs with gold-plated RCA sockets.
  • High-end banana speaker terminals accept raw speaker cables up to 10AWG and most popular types of connectors.
  • Treble/Bass sound regulation - to perfectly adjust the sound to your preferences.
  • Removable Schuko-IEC C13 power cable gives an option to upgrade the system with a premium audiophile power cable in any time.

Design Hybrid amplifier
Class A/B
Vacuum tubes Depending on the option:
2 x 6P1 & 2 x 6N1
2 x 6H1N & 2 x 6N1N-EB
Power output / impedance 2 x 25W RMS 4ohm
2 x 18W RMS 8ohm
Wireless connectivity Bluetooth® v4.0
Digital inputs USB
(audio files: APE, FLAC*, MP3, WAV)

* Supports FLAC files up to 48kHz (sample rate) and 918Kbps (bit rate).
Analog inputs CD, Line
Analog outputs RCA Pre-Out
Headphone output Impedance: 32-320ohm
Output power: 20mW, 32ohm
Frequency response 20Hz – 20kHz
Total Harmonic Distortions ≤0.5% (1kHz 1W)
Signal/Noise ratio ≥80db
Features / accessories Regulation:
Bass 100Hz ±8dB
Treble 10kHz ±10dB

Tube cover (factory installed)
Schuko-IEC C13 power cord
AC power / power consumption 220V-240V 50/60Hz, 120 W
Dimensions (H x W x D) 13.8 x 26 x 29.8 cm
Weight 5 kg / pc.
Black (aluminum) Black (aluminum)
Silver (aluminum) Silver (aluminum)

Hybrid amplifier

What does it mean and why does TAGA Harmony use this approach?

Hybrid means a combination of two different techniques to create an amplifier in one device: the World of tubes and the World of transistors.

TAGA Harmony amplifiers use vacuum tubes in the preamp section and transistors in the power stage. This results in tube, soft and analog-like sound character and at the same time high dynamics and power provided by transistors, which is usually a weak point of pure tube designs.

The sound of TAGA Harmony hybrid amplifiers is not only silky and rich but also powerful and dynamic. In addition, hybrid amplifiers compared to pure tube amps have better abilities to properly drive different kind of speakers.

After being turned on a hybrid amplifier requires to warm up its tubes to reach its full sound capabilities – it usually takes from 5 to 15 minutes depending on model and room temperature.

User manual (01-2024) Download

Vacuum tubes - what is the warranty period?

Vacuum tubes contained in our products are warranted for 6 months from the date of purchase.

HTA-25B - what are the recommendations for USB flash drives?

Not all USB flash drives may be compatible and supported with the chip used in the USB module –  a list of compatible ones is not available.

  • 32G capacity flash drives are recommended, some 64GB drives are compatible but it may be required to divide such a disc into partitions where each one is less than 32GB.
  • File system should be default FAT32 (not extended: exFAT).
  • You can have 99 folders in the root directory and 99 tracks in each of these folders (so the total number of tracks will be 9801).
  • You should avoid nesting too many folders within folders (recommended is 2-3 folders within a single folder).
  • We recommend using English letters for song names.

6N1 tubes - what replacements can be used?

One of the following tube models may be used in this device: 6H1Π, ECC85, 6AQ8.

6P1 tubes - what replacements can be used?

One of the following tube models may be used in this device: 6Η1Π, 6Π1Π.