(Tube Pre-Amps Simplified Listing for easy selection )

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Royale series (Deluxe design with fully loaded upgrades)

Royal-PRE1................................Matching super rectifier..............Matching tube DAC

Combo series (all-in-one combo design with phono stage, DAC, headphone amp...etc)

CP-101......................... CP-102...........................CP-1001 ........................CP-1001-TP

Reference series (oil caps + choke + QUAD-core output transformers, organic elegance designs)

Reference-1..................................Reference-1-RV......................Reference-2

Classic 100 series (Modern parts organic designs)

QA-001-Mk3........................QA-112-Mk3....................QA-115-Mk4

DHT prestige series (300B / 845 / 211 / 805A / 805..)

QA-300B-Mk2.................QA-300B-BAL-REG......QA-DHT-845

Super Rectifier Upgrades

STR-104.....................................STR-1001.....................................STR-1002

Add IR (Infra-red) motorized remote volume for $250

Add IR + Bluetooth motorized remote volume for $350

Add 100 micro step IR remote volume for $800

Add 24bit/192Khz SPDIF input DAC for $300

Add Blue-tooth analog receiver for $300