We are now accepting pre-orders for the ECP Audio T4 Headphone Amplifier. The next evolution beyond the popular T3 headphone amplifier, the T4 takes things a step further with the following: SMD differential circuit with all CCS components SMD-based on the same PCB. An integrated thermal bar sinks heat directly through the casework for optimum heat dissipation. ECP Audio custom-designed Lundahl output transformers, optimized for 75 and 300 ohm loads (switchable). ECP Audio's famous casework with hand-rubbed, oil finish wood sides. SumR toroidal power transformer. Many more features are included. The same tube family as with the T3 is used - 12AY7 or 12AT7 basis, with many, many more equivalents possible. (Pics below show GE clear-top 5965 tubes.) Questions? 1. Why Lundahl output transformers? They're better. 2. Why 75 ohms on the low Z side instead of 32 ohms? Focal headphones 3. Why XLR output connector? Superior, non-shorting, double grounded connection. Adapter cables will be available. Note: the production prototype above used a yellow PCB. The production models are red.