Passive TVC / AVC Preamp
Volume control with transformers instead of resistors. Silent, simple, no power cord.
A transformer (TVC) or autoformer (AVC) volume control changes level without throwing signal away in a resistor, so quiet passages stay full. It needs no power and adds no noise. We build balanced or unbalanced versions with Grayhill or ELMA switches.
- Type
- TVC or AVC, balanced or unbalanced
- Steps
- 24 to 47 positions
- Switches
- ELMA or Grayhill
- Inputs
- 2–4
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.
EssentialEssential LCR Phono Stage
Our LCR phono sound with EQ coils wound in Thailand, in two chassis with a separate power supply.
EssentialEssential Line Preamplifier
A simple tube line stage with two inputs. Adds warmth and drive to any system.
EssentialEssential Two-Chassis Line Preamp
A tube line preamplifier with its power supply in a separate chassis, for a quieter background.