To accompany his recent LM3875 DIY Chip Amplifier (gainclone) project, Bruce has put together a DIY 12AX7 Tube Preamplifier Kit to drive the chip amp. He has named the tube preamp "Beauty", as it sweetened the sound of his LM3875 Chip Amplifier.
For the enclosure, Bruce used a readily available plastic and aluminum project box from Radio Shack. This is the same enclosure he used for the LM3875 Chip Amp. The photograph below shows the Tube Preamp and Chip amp together.
Similar to what Mark discovered with this economical (read dirt cheap) tube preamplifier kit is that you get a very quiet preamp that can compete with ones that cost much more. For more information about this project, see Bruce's project page, "Beauty" - A DIY 12AX7 Tube Preamplifier Kit.
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Bruce has put together a LM3875 based Non-Inverting Chip Amplifier using the LM3875 kits available from audiosector.com. He has affectionately named his project the "Beast". For the enclosure, Bruce used plastic and aluminum project boxes from Radio Shack. The power supply consists of a 200VA toroidal transformer and is housed in a separate enclosure.
Consistent with what most are chip amp kit builders have been finding out, Bruce has found out that these gainclone kits result in a great sounding amplifier at a reasonably low cost. For more information about this project, see The "Beast" - LM3875 Chip Amp.
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To match the room decor, the enclosure has been constructed using beech plywood. The result is a fine looking loudspeaker with aesthetic appeal and great sonic qualities. Fantastic work Francesco.
For more information about this DIY Speaker Project, see the Tobler-ONE: DIY Jordan JX92S T-Line, single driver loudspeaker project.
