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I prefer the modded Elpac WM220-1 over the modded WM075-1950. Deeper, tighter bass and more dynamics are the biggest differences.
There are some of the WM220-1 available used. You may want to ask whoever you buy it from to check it for hum. Some of them may have mechanical 60 HZ vibration from the transformer. I have one here that is fairly noisy, but fine for testing out gear. I have had maybe 2 out of the close to 50 that I have modded make a lot of noise.