Review on 🎧 Sabaj PHA3 Vacuum Tube Headphone Amplifier: Enhanced Stereo Amp for Immersive HiFi Audio Experience with Low Ground Noise and Headphone Output Protection by Whitney Buckley

My main amp doesn't have a headphone jack (Acurus DIA) so I plugged the Sabaj headphone amp into the output and was then able to just flip the switch to DIA to use headphones with different devices connected while doing so I noticed that when I turned up the volume on this product, the sound coming out of the headphones was not particularly loud with the volume knob set to 2 o'clock and turned further to keep it from being louder. I use cheap Philips headphones (no bass , but clear mids and highs) and find them very easy to control - I use them with an old iPod Nano and the volume is adequate.I looked around for headphones to buy a replacement thinking it might be a problem , but then I tried to connect the headphones directly to some sources.- It was the same maximum volume- So this is it in fact the only thing that serves this Sabaj amp. Capacitance with ZERO gain and no icy sound enhancement. With all the good reviews I like to assume I only have one defect, but it's kind of poor quality control to let such an obvious defect fall into the buyer's possession. Luckily I discovered the problem before the 30 day return period was over as it turned out that this product is NOT under warranty. Revain has its own electronics support department. and they covered return shipping; Cheers to the Revain service.