A lot of LS3/5a fans in Hong Kong agree that Leak 12.1 vintage amps are the best tube amps for these speakers. Many people also got very good results with Quad II and Eico vintage amps.
I've only heard the combo once, because one of my employees owned a set of LS3/5as. We ran them on our S-30. The speaker is an effortless load (16 ohms) so it is very tube friendly. I remember being quite surprised at how well they did bass. And the rest of the range was fine. the S-30 is as big an amp as you want to put on them; the LS3/5s don't take a lot of power.
In response to what figore states,there is an extremely brilliant audioguru who works in Excel HiFi in HONG KONG,he matches his LS3/5a with the Futterman OTL monoblocks,and this is a guy with access to any audio gear he wishes to have. Sphere.
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