Pass amps are fantastic...most can agree with that statement. Their preamps, another story. I have had a few and have found them to be dull, lifeless, and anemic in sound characteristics. I went from SS amps and preamps, to pairing of SS amplification and tube preamp, and have never looked back. Yes, the Steelhead is a fantastic phone pre, and some have used it as a preamp as well with impressive results. Aric Audio makes some of the best bespoke tube gear on the market. Step outside of your comfort zone and I believe you will be rewarded.
Happy listening!

