The Stiletto II preamp (Ace, Deuce, Trident) Crunch channel is a 100% straight clone of a Marshall JCM 800 2203 preamp. The brightness in these amps that bothers some people is typically associated with the Crunch channel and can be tamed by removing or modding the the Treble Peaker at C14.
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I modded mine with a 3 way switch for Stock voicing, Half-Treble and No Peaker. It makes a world of difference. I can play my Tele with this amp now (with the Peaker bypassed).
I use my Stiletto II Deuce with a Fender Supersonic 2x12" closed back loaded with V30s. I also have a Mather 2x12 open back loaded with Reinhardt R65M-LCs. Its sounds fantastic with both amps
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I have the Stiletto, an Electra Dyne 2x12 combo with MC90s, and a Royal Atlantic head. I find them all to be very different amps. I've hung onto the Stiletto because it has upper harmonics that the other two amps just don't.