I tried to listen to my 2100 on both a pr of AR3a (low efficiency with deep bass extension) and Triangle Titus 202 (efficient stand mount monitors with extended treble, but limited bass extension). So you are looking at tradeoffs when making your decision. Neither choice represents the ultimate in sonic accuracy. You will hear greater transparency, midrange depth and lifelike vocals using the Fisher 500b. You will get more dynamic range and deeper, tighter bass response using the Mac amp. Heresy III are definitely efficient so you are covered there, and they are an easy load to drive. Sonically, unless you have efficient speakers, you are comparing apples to oranges. The 2100 (and 2505) represent 2nd generation SS, but still many steps away from the full potential of the technology.
The 500b/c represent tube technology that is very near full potential for the technology circa early 1960s. The 2100 (and 2105) is good for a about 140wpc, though it is rated for 105wpc.
You just can not get much more power from a pair of 7591 tubes. I have a Mac 2100 (chassis version of the 2105), 2505 and C28.Ī Fisher 500b/c are good for about 30wpc.max.
I have several Fisher 500c, a 500B, a restored 400.
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