The team at Hafler Dynaco have been in touch to tell us about some new products and  where you can find them at this years High End Show in Munich.

HA75-DAC is a tube based headphone amplifier and USB digital to analogue converter.
The new HA75-DAC builds on the legacy of the previous HA75 Tube Head headphone amp by adding a USB DAC for digital audio playback at up to 192 kHz resolution. This allows for connection to a laptop with high resolution audio files along with separate analogue audio sources; a front panel selector switch chooses between the analogue and digital inputs. 

The heart of the HA75-DAC is the 12AX7 tube. A non-radiating charge pump is utilized to apply 140 volts to the tube for optimal headroom and vintage inspired warmth. Also included is the Focus control, which can be dialed in to simulate the effect of listening to live speakers in a room.

Another new feature on the HA75-DAC is the headphone load impedance selector. This can be set from 20 to 400 Ohms and allows users to set the optimal impedance to match all types of headphones. This is complemented with a three position voicing switch that can be used to boost low frequencies, increase overall loudness,  or set to bypass for neutral voicing. The HA75-DAC features both XLR and RCA analogue audio connections.

Delivery of the HA75-DAC will begin May 2017.

MSRP: $1299.99 USD

The PH50B and PH60B are phono preamps that feature both unbalanced RCA and balanced XLR outputs for connection to HIFI playback systems or pro audio equipment.

Now with the addition of balanced XLR outputs, the PH50B and PH60B can be easily connected with pro audio equipment such as mixing consoles and recording interfaces, allowing for playback in the studio or digitisation of vinyl collections.

The PH50B is designed for moving magnet (MM) cartridges, while the PH60B includes a second gain stage for low output moving coil (MC) cartridges. Both units feature gold-plated RCA inputs. True +4dB line level signals are available at the XLR outputs, which can be switched to -10dB operation via an internal push-switch. Ground lift switches help to eliminate buzz and hum from ground loops when connected to these XLR outputs, and a low cut filter eliminates excessive low frequencies and turntable rumble. Additionally, the PH60B features internal jumpers that adjust the input impedance for ideal matching with different moving coil cartridges.

The Dynaco ST-70 Series 3 tube amplifier is 35 watts per channel and switchable between both 4 and 8 Ohm outputs, with Class-A push-pull stereo topography. The ST-70 Series 3 builds upon the proven design philosophies of the original David Hafler-designed Stereo 70. 

Dynaco engineers have made extensive use of high-quality parts that were unavailable at the time of the original design including precision metal-film resistors, poly-composition capacitors and miniaturised high-capacity power supply electrolytic capacitors. In addition, many of the newer parts are also built to tighter specifications than the originals. For instance, the PCB is constructed of military-grade, double-sided epoxy fiberglass PC material. In compliance with modern practices, the speaker binding posts have been updated, and a heavy-duty three-pin detachable grounded power cord is provided. Signal ground is the same as electrical ground and chassis, and all signal connectors are gold-plated.

The latest rendition has seen a substantially overhauled power supply from the original version, employing a larger dual-primary power transformer with improved line regulation, increased filter capacitance, and a solid-state rectifier that results in a much more articulate response. The resulting bottom end is a dramatic improvement over the original Stereo 70’s low-end response. This is augmented with a three-position high-pass filter switch to allow listeners to tailor the low-end response of the amplifier to their personal tastes.

You will them all at Halle 1 A02.

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