Hybrid integrated amplifier
HT-50
The whole voice, in one box.
The amplifier that made OSV Audio’s name. A class A tube input stage, a bipolar output stage and nothing in the signal path that does not need to be there. Five out of five in HiFi Pig.
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Hybrid topology Class A tube input, solid state power -
2 x 50 W into 8 Ω, 75 W into 4 Ω -
Handcrafted By hand, in Poland -
Selected components Jantzen Audio Superior Z-Cap -
Five stars HiFi Pig, 2023 -
Private listening By appointment
Crafted to inspire
The HT-50
The sound
Natural. Dynamic. Effortless.
Reviewers keep reaching for the same words. Marek Dyba of HiFi Knights called it "very open, effortless, lively, agile, and completely fatigue-free", and closed with "one hell of an amp that outperforms most of those I know, and some more expensive ones too".
Janine Elliot gave it five out of five in HiFi Pig: "Everything was there that you needed: bass power, treble detail, and a beautiful midrange."
- Open, spacious presentation
- Colour and texture without haze
- Agile, unforced dynamics
- Detailed without any glare
- Fatigue free over long sessions
Inside the HT-50
Hybrid engineering. Timeless performance.
One chassis, no compromises in the signal path. The tube stage runs in class A through a custom designed SRPP circuit; the bipolar output stage takes over where current is needed.
The mains is filtered by a DC blocker before it reaches anything, which is why the amplifier stays quiet whatever the house wiring is doing.
- Tube input stage One JJ 6SL7 and two NOS 6J9P-E tubes, class A.
- Solid state power stage Bipolar configuration in class AB, 2 x 50 W into 8 ohms.
- Selected components Jantzen Audio Superior Z-Cap coupling capacitors.
- Clean mains AC filtered by a DC blocker for the best performance.
Every figure, in one place
Technical specification
Topology
- Type
- Hybrid stereo amplifier
- Preamplifier stage
- Tubes, class A, 1 x JJ 6SL7, 2 x NOS 6J9P-E
- Preamp circuit
- Custom designed SRPP stage
- Final stage
- Bipolar configuration, class AB
- Coupling capacitors
- Jantzen Audio Superior Z-Cap
- Mains conditioning
- AC voltage filtered by a DC blocker
Performance
- Output power
- 2 x 50 W RMS @ 8 Ω, 2 x 75 W RMS @ 4 Ω
- Max input voltage
- 5 V RMS
- Input sensitivity
- 0.7 V RMS
- Input impedance
- 50 kΩ
Connections
- Analogue inputs
- 3 unbalanced RCA line
- Optional inputs
- Bluetooth
Physical
- Dimensions
- 430 mm (D) x 435 mm (W) x 185 mm (H)
- Weight
- 15 kg
Specifications as published by OSV Audio. Bluetooth is an option, not fitted as standard.
Trusted by audiophiles
Reviews & Awards
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ConvinceMeAudio
It's extremely weighty, very resolving, very punchy, excellent black background, enormous stage. It excels at driving inefficient bookshelves and moderate tower speakers, offering excellent control over mid-bass and sub-bass frequencies. Its ability to create a holographic image and provide tonal density makes it competitive with significantly more expensive integrated amplifiers.
Koji YouTube · 28:42
Video review
Watch ConvinceMeAudio on YouTube, opens in a new tab -
The Greek Audio Geek
It's so much better than it has a right to be. I'm not sure I've ever heard an integrated at or near this price… that comes anywhere close to this. This was able to produce that rhythm, that timing, that pace, that openness, that airiness.
YouTube · 16:55
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HiFi Pig
Everything was there that you needed: bass power, treble detail, and a beautiful midrange.
Janine Elliot November 2023
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HiFi Knights
One hell of an amp that outperforms most of those I know, and some more expensive ones too.
Marek Dyba November 2024
Highly recommended
Read HiFi Knights, opens in a new tab -
Audio Muzo Fans
A sound full of colour and natural dynamics, yet without the haze and heaviness so often associated with tubes.
December 2025 translated from Polish
Rekomendacja
Read Audio Muzo Fans, opens in a new tab
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HiFi Pig 5 star review -
Audio Muzo Fans Rekomendacja -
Bass Player Magazine Gear of the Year 2019 awarded to JK Amplifiers, the workshop OSV Audio grew out of
Video reviews
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11:45 OSV Audio HT-50: Polski wzmacniacz, który zawstydza gigantów?
audiomuzofans.pl
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28:42 The Tungsten-V2, Immanis & Susvara MONSTER! OSV HT-50 integrated amplifier
ConvinceMeAudio
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16:55 Best Kept HiFi Audio SECRET? OSV Audio HT-50
The Greek Audio Geek
Built by hand, heard for years
Craftsmanship without compromise.
Every HT-50 is assembled by hand in Poland by people who care as much about your music as you do. From hand wiring to the final listening test, we take the time the amplifier needs.
We build in small batches. Nothing leaves the workshop until it has been listened to.
Experience OSV Audio
Book a private listening
Hear the HT-50 in your own system. Book a private session at our workshop, or in your own room.
Tell us what you listen to and where you are, and we will arrange it.
