Low heat alternative to FIRSTWATT J2 ?

Nelson Pass designed a 40 watt push pull version of the S.I.T. using the Sony VFET for the D.I.Y. community, it is pure class A. I used this amplifier in my system for 3 weeks recently. It gets very warm but not hot. I don’t see how the First Watt J2 (lower power, 25 watt @ 8 ohms) could result in a significant heat issue unless the room is unusually small and closed in.
Charles

It was mentioned above that all Pass/F.W. amplifiers use NFB.   The F2, F4, M2  and S.I.T. do not utilize NFB.
Charles 

I have a FW F5. Does it run hot? Yep! However in the summer months, I will turn on my ceiling fan,and the temp drops considerably. 

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zuio  I went through this EXACT dilemma recently, my firstwatt f7 in my small non air conditioned bedroom in hawaii was not useable due to heat but it sounded so good.  The amp replacement that made me happy is the Folsom TD7297 diy amp pcb and folsom antipole psu, it's a 15 watt class AB amp.  You can have a builder make it for you, such as Radu at simpletubepleasures.  It makes no heat and sounds as good as my firstwatt, with even more dynamics