The Neurochrome HP-1 headphone amplifier was an incredible amp – and still is for the fifty lucky buyers of the circuit boards or fully assembled amplifiers. I designed the HP-1 with only performance in mind. Unfortunately, this also meant that the production cost was very high, which made mass-production cost-prohibitive. Thus, I was unable to meet the demand for fully assembled amplifiers once the word of the HP-1 got around. As result, the HP-1 has been discontinued.

Neurochrome HP-1

I obviously realized the market need for a headphone amplifier designed for performance, while not completely neglecting looks and feel. In addition, I found several ways that I could optimize the HP-1 for mass-production without sacrificing performance. 

This development led to the Tom Christiansen Audio HPA-1. This amplifier was designed to be mass-producible at a price point lower than that of the Neurochrome HP-1. I managed to accomplish this while only giving up a little bit of output power (the TCA HPA-1 provides 1 W into 32 Ω versus the 3 W of the Neurochrome HP-1).

The TCA HPA-1 is available at:

Tom Christiansen Audio HPA-1

Note that the Tom Christiansen Audio products are designed from the ground up as retail products. They will not be available as DIY products.

Similarly, the Neurochrome products are designed as DIY products and will not be available as retail products.

I am planning to release a DIY headphone amplifier, the Neurochrome HP-2. Sign up for my newsletter and keep an eye on its product page for the latest news regarding the HP-2.