Which Amp To Build?

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never heard a DTQWT. looking at Troels G's characteristic though, it shows a bit more roll off high up in freq than usual? an F5 amp might be a good match.

for horn setups though, F3 (or ACA) have been a popular choice. F5 vs. the latter two: these amps come from the two ends of the spectrum, the "accurate" end and the forgiving "musical" end. so if you build both you should appreciate the choices/difference. (mind you F3 had a lowish input impedance if I remember correctly).
 
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