Out of the box my HT-1 has always sounded great. It loves nice OD pedals as well. I've had it over two years now so I finally decided to change speaker and tubes in it. I put a Mullard 12AX7 in the preamp spot, replacing the Sovtek which was in there. For the power tube I put a NOS GE 12AU7/ECC82, replacing the OEM TAD. When I saw the OEM Blackbird 8 ohm speaker, I decided to change it out to a Jensen P8R 4 ohm ALNICO magnet speaker. The bummer is that it did not fit. The horseshoe ALNICO magnet stuck out too far. I wound up putting another Jensen in it. I put a C8R 8 ohm Jensen which sounds really nice for a ceramic magnet speaker. Next time I open it up to try other ECC82 tubes, I'll take some photos of the little chasis with components. I can now get crunch even in the clean mode when I bring up the gain. I like those Mullard preamp tubes. They are current production. I got them a few years ago new. I want to try a Tung-Sol 12AU7W as well. I also have JJ and an EH I can put in there.