The 2105 was my first Mcintosh amp too, nice to hear it arrived in such nice condition.
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In 1976, I bought my first McIntosh 2100. (same as the 2105, but without the faceplate and meters) I bought it new, because my friend's dad said it was the "best", and I took his word for it. I kept that amp and loved it for 12 years and made the mistake of selling it to my friend. Two years later, I found a used 2105 in the paper and bought it. I have had other amps, including an MC300 I shouldn't have sold, but won't make the mistake of selling this one again. It's a great amp, and a true classic. Enjoy it.
I understand your elation over having finally gotten Mac gear! I drooled over their gear for several years, and finally in 1978 I was able to get brand new stuff, a C32 preamp, MR78 tuner, and MC2205 power amp. I've loved their gear ever since, even tho I no longer have those pieces. Welcome to the "Mac club"!
I have been a Mac user for 20 years, MC2100 to be exact, As Roxy mentioned it is the same spec as the 2105 except without the meters. I love it so much I bought another one, so now I bridged it and use them as mono block, one for each speaker, (Vandersteen 2CE Sig. II ) let me tell you, wow! It really woke up the speakers, so much clearer, better staging and more deeper bass. Anyway just recently I bought an MC2105 for back up just incase. So I know you'll be happy with the 2105 believe me I know.
Congrats. My first Mac amp was the 2105, new in the early 70's. The Mac Rack (2105/C28/MR77) was hypnotizing at night, sound was fantastic.
Somewhere along the line some people got the idea that the 2105 put out 105 watts and the 2100 only 100. Don't know where those extra 5 came from, maybe the glass? :-)
They were both rated at 100 wpc but actually put out around 150. The first 3 generations of SS Mac used a 5 at the end of the model # to indicate it had glass and meters. I think it was nice that they offered the same amp at a much lower cost if you didn't want the fancy trimmings. Enjoy your classic.