I'm convinced the FX and the Miniwatt/APPJ are a match made in heaven. So much so that the Volt+D is now in another system driving woofers.
The MW is a seriously good amp when used with efficient speakers. When my original Miniwatt S1 was introduced some 10 years ago I paid over $250 and thought that a bargain for a SET amp. Today you can buy one on sale at massdrop for $99. It doesn't look like mine as it's trannies are on bottom but otherwise it's the same amp.
Love the bump in gain the FX gives the MW. If you follow the thread here on the MW/APPJ you already know what others are saying about the 4 tube model.
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