Essential 300B Single-Ended
The 300B sound at an accessible price, with transformers wound in Thailand.
The Essential 300B keeps everything that matters in a single-ended triode amplifier: a 300B output stage, no global feedback and a tube rectifier. We save cost by winding the output and power transformers in Thailand to our own design, using a simpler chassis and a standard 300B pair. You can upgrade to ISO/Tango output transformers and premium tubes at any time.
- Output tube
- 300B (standard pair included)
- Power
- ≈ 8 W per channel, Class A
- Feedback
- Zero global feedback
- Driver
- 6SN7 or 5687
- Rectifier
- 5U4G tube
- Transformers
- Soundaries custom, wound in Thailand
- Outputs
- 4 and 8 Ω
- Chassis
- Powder-coated steel, wood side panels
Includes a standard 300B pair and all other tubes.
From your room to your rack
01Your room
We start with your speakers, your room and the music you play, then draw the circuit around them.
02Chassis and wood
Panels are cut, drilled and engraved here, and the frame is made from Thai hardwood.
03Hand-wiring
Every joint is wired and soldered by hand, point to point. You get photos as it comes together.
04Burn-in and listening
Each build runs for days on the bench and is measured and listened to before it ships.
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Four chassis, two per channel. A 45 drives the 300B through an interstage transformer.