45 & 50 Single-Ended
Low-power directly heated triodes for very sensitive speakers. Clear, quiet and fast.
Some of the most beautiful sound we have heard comes from the smallest tubes. A 45 gives about 2 watts and a 50 around 4, which is plenty with horn or full-range speakers. Our 45 amps use a 45 to drive a 45 with Tamura transformers all the way, and a mercury-vapour rectifier with a damper tube for a slow, gentle start. We build them as stereo amps, vertical monoblocks or with separate rectifier stages for driver and output. Recent units have shipped to California and Australia.
- Output tube
- 45, 50, 2A3, or Telefunken RE11 on request
- Power
- ≈ 2 W (45) · ≈ 4–5 W (50)
- Driver
- 45, 46, or high-mu triode such as NEC 12AD7
- Transformers
- Tamura input, interstage and output
- Rectifier
- Mercury-vapour with damper tube
- Filament supply
- Tentlabs DC filament regulators
- Speaker match
- Best with 95 dB/W or more
Includes a matched tube set and spares where available.
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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