This amp is basically a 302B, using 6550 output tubes, rather than EL34. If your speakers are not sensitive enough to be driven by the 302B, you would need either this or the 801. I prefer the 302B by a wide margin, if you can get away with it. It has a wonderful sound. The need for greater power would lead me to the 801. In my opinion, both the 302B and the 801 are better choices than a 502. But, I would not shy away from a used 502, because you can then throw EL34 in it. You also could try the amp with KT88, for a sweeter sound, to me. I have also heard of people using KT90s in Jolidas, but have not heard one.
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