Mcintosh choice - upgrading?


Hi
I’ve narrowed down my search for a Mcintosh power amp that will go through an Ma6200 between mc150/mc7150 or an mc7200.The 6200 will operate as a pre beacuse i want to try a little more power for my vintage jbls.
In fact i really like my 6200 sound and i think that if there is something i wouldl like to add is some more bass tightness/control  and attack.
For mc150 i read limited and different reviews ,some say its a little different from the traditional Mac amps some others praised .Is it so and how does it compares with the mc7150 or even an older 2155?
The 7200 seems indeed a special one as not having autoformers.
So the question is which addition of these amps to the Ma6200 makes more sence in upgrading ?
kalypo

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