300B Single-Ended Stereo
The classic 300B amplifier, one chassis, voiced for 90 dB speakers and up.
Most of our first-time clients start here. A 300B single-ended amplifier has no feedback loop and no crossover between tubes, so the music arrives the way the recording sounded. We build each one around the transformers and driver tube that suit your speakers and your room, and we can switch between driver tubes such as 310A and 6C6 when you like to experiment. Recent builds have gone to Naples, Bang Bon and Quebec.
- Output tube
- 300B (WE, EML, Psvane, Takatsuki or your own pair)
- Power
- ≈ 8 W per channel, Class A
- Feedback
- Zero global feedback
- Driver
- 310A, 6C6, E280F or D3a — chosen per build
- Rectifier
- Tube: 5U4G, 274B, or 866Jr mercury-vapour option
- Transformers
- ISO/Tango or Tamura output, ISO power and chokes
- Outputs
- 4, 8 and 16 Ω taps
- Chassis
- Powder-coated steel on solid Thai hardwood frame
Includes a burn-in period and a test video before shipping. Premium 300B pairs can be quoted separately or supplied by you.
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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The 300B sound at an accessible price, with transformers wound in Thailand.
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Four chassis, two per channel. A 45 drives the 300B through an interstage transformer.