It's a beast of an amp. Like the Yamaha integrated I had from that era, I think all those power amps were class A for the first 10 watts or so and yes ran hot.
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The M-70 was 200wpc and was A/B. The M-80 that replaced it was also class A/B but had and 'Auto Class "A"' feature. The amp could run in pure class A up to about 25wpc. It sounded much better in A/B mode. Trust me, Levinson didn't lose any sleep over them.
Nice amp, the M-70 is the one to have.