Hafler PH34 Passive Phono Step-Up Transformer for (SUT) 5-Ohm Moving Coil Cartridges

This SUT was used in non-smoking environment and is in excellent working condition. Was used with both Denon and Ortofon styluses.

Full description follows:

Hafler PH34 Passive Phono Step-Up Transformer for (SUT) 5-Ohm Moving Coil Cartridges:

• Passive ‘amplifier’ for moving coil cartridges
• Jensen Transformer equipped for ultra pure signal transfer
• Hand wired for optimal performance and low noise
• Two models for Denon and Ortofon type styluses

Using the PH34 SUT is very easy. You merely connect the output from your turntable to your Hafler SUT and the output from the SUT to the phono input on your receiver.

(I used it into a phono pre for line level output into a BAT VK-3ix tube amp.)

Your Hafler PH34 SUT does not require any power to work. It is a passive device that employs two high-performance Jensen audio transformers. These are exceedingly difficult to manufacture as they produce tremendous gain without any electrical power whatsoever. You merely plug in and begin to enjoy.
Hafler SUT's are designed to go into the MM dynamic phono preamp input of your receiver or preamplifier.

Jensen Transformer Inside The PH34 employs a Jensen JT-34K-DX step-up transformer with a 1:37 turns-ratio that adds 31dB of gain for 5Ω cartridges for use with Ortofon™ or similar cartridges. The PH44 employs a Jensen JT-44K-DX transformer with a 1:10 turns-ratio that adds 20dB of noise-free gain. This is ideally suited for Denon™ or similar cartridges. Jensen’s extended frequency response and near-perfect phase accuracy produce unmatched sonic transparency. The use of internal Faraday shielding and double layer magnetic cans gives them immunity to hum, buzz and RF interference. These are some of the attributes that have made Jensen a legend and is why they are often described as the world's finest transformer manufacturer.

Proudly made in North America, the Hafler PH34 and PH44 SUTs are passive devices that employ ultra high performance Jensen Transformers to boost the low-level signal produced by a moving coil cartridge by as much as 31dB without any amplification or the associated noise that they produce. Jensen wrote the book on transformer technology and for over 40 years has gained the accolades of being the world’s most respected and revered audio transformer manufacturer.

The design begins with a 14 gauge steel casing to shield the low level signals from external magnetic fields and RF contamination. Gold-plated input and output RCA connector pairs are employed that will not tarnish over time, thus optimizing signal flow. Inside, each Jensen transformer is double shielded with heat treated (annealed) nickel composite cans and supplemented with internal Faraday shielding to deliver over 120dB of hum rejection at 60Hz. And with less than 0.05% distortion, virtually zero phase shift and a frequency response that spans 10Hz to over 100kHz, you can rest assured that the signal transfer is pure and uncoloured.

Designed to optimize the performance of any given stylus, the PH34 employs a Jensen JT-34K-DX transformer with a 1:37 turns-ratio that adds 31dB of gain for Ortofon type cartridges (5 Ohms typical) while the PH44 employs a Jensen JT-44K-DX transformer with a 1:10 turns-ratio that adds 20dB of gain for Denon type cartridges (45 Ohms typical). Since the Hafler PH34 and PH44 are designed for the purist, there are no controls. One merely connects the turntable to the SUT and sends the output signal to a standard phono input on the receiver or preamp. The Halfer SUTs quietly do the work without adding noise, distortion or artifact.

PH34 Specs Circuit:Passive transformer based design Inputs:Gold plated RCA Output:Gold plated RCA Impedance:Optimized for 3-5 Ohms stylus Gain:31 dB