FX Audio TUBE-03 Tube Preamplifier – Dual 6K4 Tube MM Line Preamp with Tone Controls
The FX-Audio TUBE-03 is a compact, tube-flavored line preamplifier and buffer designed to add warmth and musicality to any hi-fi system. It combines a dual vacuum-tube front end with solid-state circuitry to provide tasteful tube harmonic coloration while retaining control and low noise for vinyl, CD, streamer or digital source connections. The unit accepts single RCA line inputs and provides stereo RCA outputs for easy integration with power amplifiers or active speakers.
Small enough to fit on a shelf yet built with audiophile priorities, the TUBE-03 ships with two installed 6K4 tubes, a DC 12V/1A power supply, and an RCA cable—giving you plug-and-play tube sound with RIAA-friendly neutrality and adjustable tone options on some variants. It’s a straightforward way to introduce tube character into modern systems without complex setup.
This item is available for local pickup in Brampton. (Details)
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Features:
- Dual Vacuum Tube Front End – provides natural harmonic warmth and a more engaging midrange.
- RCA Line Input & Output – simple, universal connections for integration with amps and powered speakers.
- High Signal-to-Noise Ratio – retains clarity and low background noise for detailed listening.
- Compact Aluminum Chassis – small footprint for easy placement in desktop or rack setups.
- Included Power Adapter – DC 12V/1A adapter included for quick setup and consistent power.
- Replaceable Tubes – tubes are user-replaceable, allowing tone modification by swapping tube types.
- Simple Front Panel Controls – intuitive volume/tone control (depending on variant) for quick tonal shaping.
- Affordable Tube Character – an economical path to tube sound for modern systems.
Specifications:
- Model: FX-Audio TUBE-03
- Tubes: 2 × 6K4 (installed) — compatible replacement types noted in manual. :contentReference[oaicite:2]{index=2}
- Inputs: 1 × stereo RCA
- Outputs: 1 × stereo RCA (line out)
- Output Level / Sensitivity: typical line output ≈ 0.9–2.7 Vrms depending on variant (check manual/spec sheet). :contentReference[oaicite:3]{index=3}
- Signal-to-Noise Ratio (SNR): ≈ 98–100 dB
- Frequency Response: 20 Hz – 20 kHz
- THD: typically very low (manufacturer published values vary by revision)
- Power Supply: DC 12V, 1A adapter included
- Controls: Power switch and front-panel volume; some versions add bass/treble adjustment
- Chassis Dimensions: ~118 × 98 × 28 mm (varies slightly by version)
- Weight: ~350–480 g (varies by version)
- Color: Black (standard)
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