JLTi Phono - Back Again

133 Dalmeny Drive, Prestons NSW 2170, Australia +612-96074650 & 0412-203382

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 NEW:  Stereophile 2015 "Recommended Components"  says: 

"This diminutive JLTi Phono Preamp offers MM and MC compatibility and [with] loading via resistor fitted RCA plugs... the JLTi produced a warm sound with impressive low-level detail... among the best value currently available in MM/MC Phono Preamps."

NOW MARK 5 !!!

AUD $500 to Upgrade ALL Previous Models

The “Solid Diamond” Phono Stage

(Australian No-Frills Version)

Now AUD $990.00

(now Free Shipping World-Wide)

(The Swiss version was originally USD $1795.00 or AUD $2000.00)

Read American Review

The original JLTi Phono Stage was designed here in Australia and the earliest manufacturing runs were done here in Sydney. Eventually, manufacturing were transferred to Vacuum State Electronics in Switzerland. Alas, since the co-designer Allen Wright is no longer with us, it has been decided to make the Australian version available again as the Swiss version is no longer made. The Swiss JLTi Phono was sold for USD $1795 - the Oz version is a No-Frills version (in no way does this imply it is inferior sonically, simply lower cost metal-work etc).

December 2016 NEWS:

We are developing an Optional External DC Power Supply for the No-Frills Phono Stage. It is expected to sell for AUD $800 (less AUD $30 for trade-in AC Plugpack) and this will be quite a bit less cost that the Swiss made option. But we also wanted to make it better performance as well as lower cost. This new supply will be based on Inductors and less reliance on Capacitance - the improvement is super low ripple and sine wave rather than noisy sawtooth, hence dramatically lower noise measured in microVolts. Older units can be updated, but needs to be returned. More info, please email.


The JLTi Phono Stage is unlike any other Phono belying what it does in an unassuming way.

The name denotes that this is a Solid State device using something that is called Diamond Transistor Theory, rarely used on High-End Audio products. The most simple and linear audio voltage amplification device is a Vacuum Triode which consists of three electrodes only. They are the Grid (input), Cathode (grounding) and Anode (output). On the other hand, the Solid State Transistor is a current device but is nowhere near as linear as the Triode. It consists of Base (input), Emitter (grounding) and Collector (output). The idea behind a Diamond Transistor is actually a composite circuit that emulates the near perfect and linear Transistor as a current device with the same three electrodes in the circuit then becomes the equivalent of the Base, Emitter and Collector followed by a Unity Gain Buffer.

 Our Diamond Transistor eschews feedback completely and uses Passive EQ:

The JLTi Phono Stage is at once a very advanced concept and yet also elegant in its simplicity when executed properly. The Power Supply is pure Class A Constant Current “SuperReg” as developed by Vacuum State Electronics and now increasingly been copied in High-End Audio.

The JLTi Phono Stage is easy and straightforward in operation. It does not have any On/Off Switch and designed to be left permanently On. Only when away on holidays, it may be advisable to disconnect from the Mains Supply (same as with other electrical appliances).



Inputs for both Moving Coil and Moving Magnet cartridges

Load Sockets to Optimise Cartridge Performance

Two Gain Levels, marked MC (Moving Coil) and MM (Moving Magnet)


1 JLTi Phono Stage

1 Power Adaptor

1 Instruction Sheet

Optional: 2 Loading Plugs 100 Ohm

 The Optional Loading Plugs are for standard value 100 Ohm load of Moving Coil cartridges. The Earth Binding post is where the Ground from Turntable can be connected.

 Tips & Hints

The input defaults to standard 47K Load, but with 100 Ohm Loading Plugs is for setting up most Moving Coil Cartridges as recommended. But the purpose of the Load Sockets is to experiment with different value Load Resistors which can be soldered into RCA Plugs and then inserted. Changing this Load Value in turn changes the minute electro-mechanical damping of the cartridge and can be tuned by experimentation to obtain the best sound. Typically, some Moving Coil cartridges sound at their best with as low as 10 Ohm Load rather than the usually recommended 100 Ohm. Others at 33 Ohm etc.

Optimising Moving Magnet cartridges can go as low as 2K Ohm, and High Output Moving Coil even much lower. By using trial and error and careful listening, the potential best performance can be attained for your expensive investment, as good quality cartridges (and turntables) are not cheap. The rule is simple, the lower the Load Value, the higher the damping. Listen to the effect of increased damping and you will soon discover the sonic effect and how to arrive at the best result. Most cartridges are listened to under-damped and you can benefit from listening to optimised damping. Improve your sonic performance at no significant additional cost.

JLTi Products by  Custom Analogue Audio Sydney, Australia


My continued listening has been most pleasurable... I find the JLTi [Phono] resolves an amazing amount of detail. It also captures an extended bass response and a large hall ambience. My favorite test for these last two characteristics is found on side two of "The Mission", a soundtrack recording. A concert bass drum is played on a couple of the tracks. With the JLTi, one hears not only the deep note of this very large drum, but the attack and decay as the mallet strikes the drum skin, then the sense of space from the recording studio as each note fades away are fully revealed...most tracks are interesting and fun to listen to. Tim P, California

See JLTi Phono Comments

An entirely new and totally original design. Do not hesitate to compare with anything! Yes, it does have the usual desirable attributes, such as no negative feedback, all passive RIAA EQ, very low noise, etc. Yet the electronic wizardry is very unusual, unlike anything available now. It is also an extremely elegant solution to a myriad of problems faced by the designer. Indeed, the best solution that no one else thought about.

Remarkable 100KHz Square Wave and 1MegaHertz Bandwidth

This Phono Stage is 'slew rate' induced distortion free. In fact, this is one reason why tubes sound so good, they too are slew rate insensitive. Gone is the harshness or in many cases it becomes a flat grayness that robs the music of its natural tonal colours. This new Phono Stage has extraordinary life and dynamics combined with great finesse and transparency, without any exaggerations - truthful and beautiful.

It may well be the fastest Phono Stage ever made with huge bandwidth. The after EQ response is flat from 1 Hertz to 300 KHertz plus. Not only able to accelerate but its ability to de-accelerate is without parallel. It's overload is also very high as it is capable of swinging 10V RMS - more than 20 dB headroom on a standard rated output of a Moving coil cartridge. Not only sounds great but its technical attributes are top notch.

RRP is AUD $990. The Export price is AUD $990 including Air Postage

Most countries 220V-240V, Europe, UK, most of Asia and etc, we will supply free the adapter to suit.

For U.S. and Canada users, there is a simple problem, we are unable to source appropriate Wallwort as 110-120V units are not available here in Australia. We will help you source a local one in your country.

While it is optimised for Moving Coil cartridges (testing done with extremely low 0.22mV MC Cartridge), it will also perform its magic on Moving Magnets. With MC the Signal to Noise Ratio (S/N) is superb, but with MM's higher impedances the noise rises. But as the noise level is higher with MM, so is the output voltages of MMs, hence S/N is not degraded in real terms.

When we started developing this prototype, it was decided, only IF it lived up to the performance of the JLTi Mk2, only then would the external JLTi Phono Stage become available. Happy to say, not only met but also exceeded all our expectations. This is what the JLTi brand is all about, it must compete well above the asking price.



Just Listen To it   

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Copyright © 2003-17 Joe Rasmussen & JLTi
Last modified: Tuesday November 21, 2017

Just had a terrible thought. If "intelligent design" is unscientific, then who will design our audio equipment?