Q-tron Audio RIAA14B Vacuum Tube High-End OTL Phono Preamplifier

The RIAA14B is designed as a phono equalizer that plays the most important role in analog record playback, using a thorough all-vacuum tube, OTL configuration to maintain the signal purity to the utmost.
No semiconductors, transformers, or chokes are used in the audio chain—this is a rare phono preamplifier constructed entirely from vacuum tubes from input to output.
The accuracy of the RIAA curve is within ±0.2dB, achieving both precise equalization and natural tonal quality. Designed exclusively for MM cartridges, it offers exceptionally high quality and is ideal for users seeking highly transparent analog reproduction.
The phono input features two RCA terminals, and the cartridge load can be set individually for each input. The outputs include RCA and balanced XLR, providing flexible compatibility with various systems.

“Colorless and transparent” analog reproduction realized by a fully OTL configuration

The RIAA14B’s standout feature is that, despite being an all-tube + OTL design, it achieves high S/N, low distortion, and excellent linearity.
The OTL design completely eliminates magnetic distortion and bandwidth limitations caused by transformers, amplifying the input analog signal exactly as it is.
Noise is kept below -80dBA (based on 5mV input), ensuring an extremely quiet background, which enhances the reproduction of the characteristic analog airiness and hall tone. The overload margin exceeds 30dB, allowing for spacious playback of dynamic tracks without distortion.

Highly stabilized power circuits and a 10mm thick aluminum chassis support absolute quietness

The RIAA14B thoroughly addresses noise issues, which are critical in analog playback, employing a specially designed, highly stabilized power supply for the anode and heater.
This minimizes hum and power-related fluctuations to extremely low levels, maximizing the expression of even the smallest signals.
The main unit is composed of three high-quality PCBs, and its 10mm-thick aluminum machined chassis completely blocks external vibrations. By eliminating vibration-induced noise, the bass becomes tighter, and the clarity of the midrange and treble is further enhanced.

Ideal pairing with the PRE14B, PA12B, PA3B, and PA34B

The RIAA14B is designed to maximize the transparency and accuracy of the entire system when paired with Q-tron's PRE14B preamp or PA12B, PA3B, and PA34B power amplifiers.
Since these OTL amplifiers have extremely high resolution and low distortion, a phono equalizer with equivalent purity is required. The RIAA14B meets these requirements, delivering the charm of analog records without compromising the crystal-clear sound of OTL power amps.
Of course, even when combined with other manufacturers' systems, it performs exceptionally well as an uncolored, transparent RIAA equalizer.

Accurate RIAA characteristics with quiet and extended expressive power

The RIAA14B maintains the RIAA curve accuracy within ±0.2dB, precisely reproducing the characteristics recorded on vinyl. With a low noise floor and high overload margin, it allows you to enjoy a wide range of musical genres—from delicate classical music to energetic jazz—with natural balance.
The soundstage is wide and transparent, harmonics are pure and extended, and the unique texture of analog is vividly revealed.
The RIAA14B is a tube OTL phono stage created for listeners who want to fully enjoy the pure charm of analog playback.