NHB-108 Model 1A

About the NHB-108 Model 1A

The darTZeel NHB-108 Model One amplifier is a meticulously engineered solid-state stereo amplifier emphasizing simplicity and purity. It uses only six transistors per polarity side and a single pair of bipolar output transistors per channel, with no global negative feedback and no relay switches or fuses in the signal path. It delivers 100 watts RMS into 8 ohms and 160 watts RMS into 4 ohms, with a small portion of class-A operation. The amplifier features a dual-mono design with separate transformers and large filter capacitors for each channel, connected by polished brass bus bars. It has a very wide bandwidth of 1 Hz to 1 MHz (+0/-6 dB) and low temporal distortion. The NHB-108 Model One requires impedance matching with speakers via internal switches for optimal performance. Inputs include RCA, XLR, and proprietary Zeel BNC connectors. The chassis is made of CNC-routed aluminum with damped compartments and a toughened mineral glass top panel revealing the elegant internal layout. The amplifier weighs approximately 30 kg (65 lbs) and measures 440 mm (W) x 170 mm (H) x 335 mm (D). It is handmade in Switzerland by darTZeel Audio SA and is known for its warm, tonally balanced sound that invites extended listening sessions without fatigue.