Thanks for the replies. The MA252 and MA352 are direct coupled while the MA8900 has autoformers. I also had a direct coupled MHA100 and frankly thought the speaker outputs sounded terrible.
Anyhow I'll be sticking with the Luxman 509x. I was actually using it with the MSB Discrete DAC earlier, which is a little more edgy and forward sounding than the smoother Analog DAC, though very similar in character with the same MSB house sound. Well, spending some time with the 509x mated to the Analog DAC proved it to be a wonderful match and I'm quite happy with the sound now. The power of synergy!
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