WA3 is pretty horrid IMO, slow, soft, and veiled, but is somewhat affordable. (For the record, with some exceptions, I dislike the Woo house sound: soft, slow, mushy, overly romantic, veiled, missing low-level information). Of OTLs, these are the following I would actually consider, but they cost more. Bottlehead Crack (DIY) (https://www.superbestaudiofriends.org/index.php?threads/bottlehead-crack.120/) Feliks Elise (https://www.superbestaudiofriends.org/index.php?threads/feliks-audio-elise-tube-amp-review-not.2260/) EC ZDS Millett Teton A "feature" of OTLs is higher output impedance, which will impact bass at the resonant frequency of dynamic cans, usually between 80Hz to 100Hz. These effects are actually measurable. The greater the output impedance, the greater the effect. As a result, there is often a sensation of more slam. The highs to a smaller extent will be increased. The downside to that big coupling cap is a possibility of roll-off at the extreme low end, overly thick, slow, and veiled sound. At best, it may be a luxurious or romantic sound. The bass increase from the higher output impedance can be offset through the use of leaner tubes (FR measurements don't tell us everything and leave out transient non-steady state and distortion information). The good thing about OTL is that big caps are cheaper than good transformers, thus allowing one to experience tube sound without breaking the bank since good transformers are expensive. OTLs will only be suitable for dynamic cans with higher impedance. Orthos will be a bad idea. Super low impedance orthos like the LCD-X and Verum might be asking for trouble.