Heed's award-winning QUASAR phono stage, with its discrete conception and wide range of features, meets the requirements of even top-class turntable/cartridge combinations without being “unreasonable” in the usual high-end fashion.
The new & improved Quasar MKIII is an enhanced variant of this sublime theme, as many internal components have been upgraded to raise performance - as it draws improvements gleaned from the stunning Thesis Phi.
The signal processing of cartridges is one of the most delicate jobs in amplification. All the more so because it isn’t done merely by boosting a few hundred microvolts to a few hundred millivolts. In fact, at this thousandfold amplification (60 dB) the signal must be processed as cleanly and noise-free as possible. The extremely low signal level and the frequency-dependent amplification which arises from the RIAA equalisation curve applied in the cutting of LPs make the highest demands of the circuit topology and technical realisation of a phono preamplifier.
The QUASAR is built in dual-mono configuration from the power supply upwards. There are two separate amplifier stages for MM and MC cartridges, both being fed from their own regulated power supply arrangement. Optimum adjustments to the MC cartridge in use can be applied for sensitivity and load by various settings of the jumpers on the PCB. The two separate outputs with different output levels make it possible to fine match for preamps or recorders.
The output stage has huge headroom at extremely low noise levels and, due to its low output impedance and high current delivery, can drive long interconnect cables without any sonic degradation.
The enhanced power supply of the Modular Series, the Q-PSU is based around a 50 VA toroidal transformer with low-density magnetic field and very little dispersion. This power, together with 20,000 µF filtering, can feed the circuit with the kind of super-clean current usually delivered only by battery-based supplies, even with extreme dynamic swings. Further on, the 3rd version of the Heed Q-PSU has an internal voltage regulator system. By this improvement, all the attached devices leap a huge step forward in terms of noiseless and smooth music representation.
Although the Quasar is supplied with the dynamic separate Q-PSU, other power upgrade options can now be naturally factored in - and these include the Obelisk PX and the Thesis π (pi) twin power supply.
For full compatibility please contact us via the 'ask question about this product' button (scroll to top of page).
Both the Quasar and the Q-PSU are available only in a black casing with black fascia.
Heed Audio Quasar MKIII - MC/MM: Moving Coil/Moving Magnet Phonostage - Features & Benefits:
Separated MM and MC input stages
Adjustable MC gain and impedance
Discrete bipolar transistor architecture
Separated power supply (Q-PSU)
Heed Audio Quasar MKIII - MC/MM: Moving Coil/Moving Magnet Phonostage - Specifications:
Inputs: 1 x MM / 1 x MC
Outputs: 1 x 0dBm (High Out)/ 1 x -10 dBm (Low Out)
Frequency response: 3 Hz – 150kHz
Input sensitivity (MC): 100 / 330 / 600 µV
Input impedance (MC): 100 / 470 / 1000 Ω
Input sensitivity (MM): 2.5 mV
Input impedance (MM): 47 kΩ
Gain: 50 dB (MM) / 62 – 78 dB (MC)
RIAA accuracy: +/- 0.5 dB (20 Hz – 20 kHz)
Power supply options: Q-PSU (standard) / Obelisk PX / Thesis Pi
Dimensions (W x H x D): 9.5 x 7.5 x 22 cm
Heed Audio Quasar MKIII - MC/MM: Moving Coil/Moving Coil Phonostage - Resources & Downloads:
Heed Audio Quasar MC/MM Owners Manual