I owned the Premier 12, the Premier 140 and had the TPA 30 mkII for an extended visit, while I had the 140. (I own Atma-Sphere gear today, so you are doing my amp history in reverse. ;-)
Both CJ amps are excellent big watt push-pull designs based on the 6550. The 140 uses 2 6H30 as phase splitters and one 6DJ8 type to amplify the input, while the 12 uses two 6FQ7/6CG7 and a 5751. The 12's are a solid representative of the vintage CJ sound - warmer and more rounded than the 140 - while the 140 is quicker with better resolution and image focus and slightly less grain. The TPA 30 mkII is sweeter in the mids than either CJ, tho' the CJs have a bit more low-end heft Among the CJs, if you want lush without a concern for neutrality/accuracy then the Premier 12s might be your choice. There's trade offs here (like everywhere else) - I might tempted by the TPA 30, which is the most refined of the three, at least to my ears. E-mail if you want to chat more on these three.
Both CJ amps are excellent big watt push-pull designs based on the 6550. The 140 uses 2 6H30 as phase splitters and one 6DJ8 type to amplify the input, while the 12 uses two 6FQ7/6CG7 and a 5751. The 12's are a solid representative of the vintage CJ sound - warmer and more rounded than the 140 - while the 140 is quicker with better resolution and image focus and slightly less grain. The TPA 30 mkII is sweeter in the mids than either CJ, tho' the CJs have a bit more low-end heft Among the CJs, if you want lush without a concern for neutrality/accuracy then the Premier 12s might be your choice. There's trade offs here (like everywhere else) - I might tempted by the TPA 30, which is the most refined of the three, at least to my ears. E-mail if you want to chat more on these three.