I'm totally intoxicated by the sound of my recently completed Crack-a-two-a. There's an immediacy to the sound, which fosters a real emotional connection for me. I've rolled a couple tubes and settled -- for now -- on a mil-spec Sylvania JHS 6189-12AU7WA in the input-tube position, NOS Chatham Electronics 6080WB with slotted graphite columns in the output position and a pair of NOS GE 5-star 6005s in the shunt-regulator spots. The overall character is one of crystalline clarity, airiness and silky smoothness in the mids and highs with well-rounded, incisive, punchy and robust low end when called for. So glad I made the decision to purchase this fine amp! And on top of that, there was the bonus of being able to immerse in the build process.
Here are a couple test shots I made with my iPhone earlier today. I plan to make some more nicely arranged, composed and post-processed images with my full-frame mirrorless once I've installed the TwoQuiet upgrade.
Joe.