While I was always drawn into headphone, I’ve never had the time to dig deeper and focus my attention to designing better headphones amps.

Here it is my latest amp built using the amazing sounding 71A. The output is 0.7W using a super detailed finemet core, output transformer. While it has outputs for powering speakers, there will be less use as a speaker amp. This is an integrated amp using the very nice sounding NOS Philips E180F driver, coupled to the 71A through a Jupiter copper foil capacitor. The volume pot is a smooth TKD CP2511. The power supply has 3 separate regulated dc for all filaments. The high voltage is tube rectified and using a CLCLC filtering. All these lead to a super quiet amplifier.

The sound is smooth, clean and clear. The headphone outputs are connected to the 16 ohms tap of the output transformer. The power output is 0.35W max on 32 ohms and decrease for higher Z headphones.