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PrimaLuna - Prologue Premium Pre-Amp


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The DiaLogue Premium is one of a very small and select group of pre-amps currently on planet Earth that contains all the essential ingredients for world class sound production...BUT not everyone can stretch to the what to do? No reason to fall into a heap of sobs on the floor. Not when there is ALSO the Prologue Premium Amplifier listed here for just $2775! 

This is what we know: The ProLogue Premium preamp is almost an exact DNA match with its bigger Dialogue brother. It would take a real expert to tell them apart; either from reading the schematics and build sheet or from the incredible performance.

PrimaLuna uses TWO 5AR4 rectifier tubes, one for each channel in a true dual-mono circuit that is all point-to-point wired using the highest quality parts including the awesome Alps Blue Velvet volume control. All things included in this incredible preamp weighing in at an amazing 17 kgs  

PrimaLuna buyers are typically well-seasoned tube-heads, and they know all this stuff. If you are new to tube preamps, you can help yourself by doing two simple things: Take the name and model of the product you are considering, and put it into Google. Then, get the weight and click on “Images” so you can see exactly what you are getting inside. Funny, we do that type of investigation in most everything we buy, but only in high-end audio do we get influenced by fairy dust.

Prima Luma don’t offer fairy dust. Rather you are getting world-class European engineering, the finest name-brand parts, and workmanship that’s been declared over and over by experts to be untouchable.

Details, details, find some but not of the things you need to know about this amazing pre-amp below...why havn't we included everything you might ask? The answer is simple. We want you come into Len Wallis Audio where you can experience this piece of sublime hardware first hand. 

Dual Toroidal power TRANSFORMERS
Why? For the lowest noise. The #1 reason for having an outboard power supply on a preamp is to isolate sensitive small signals from EMI and hum radiated from the typical EI transformers used by many companies. The best cure for this problem is to use toroidal transformers, as they don't radiate EMI outside the core. Transformers are the single most expensive part in audio equipment, and that usually means cutting corners. Toroidal transformers cost much much more than typical EI core, because they take a long time to wind. Instead of a machine making many at the same time, the best quality ones like we use at PrimaLuna are made one at a time in-house. They are massive, resulting in a preamp weighing a substantial 37.5 pounds.

Tube rectified, dual mono design
In the world of preamps, experts agree that tube rectification offers the most natural, textured, vibrant presentation. That's why you find it in the best, top of the line models. Finding a preamp using one rectifier tube is sweet. But PrimaLuna uses two 5AR4 rectifier tubes in their dual-mono design.
Look at the interior photos and you will see that all PrimaLuna preamps are actually two preamps in one chassis. The result is obvious. Better no other. That's where the weight comes from.

SuperQuiet Line Inputs
Input selector switches mounted on the front panel requires long wires to run from the switch in the front to the rear RCA jacks, and they invite stray noise like RF and EMI.
PrimaLuna has a better way. Instead of a switch, input selection is done using premium quality sealed relays mounted in the rear where you plug in your components. When an input is selected, that relay closes giving you the best connection possible. All the other relays are left open, so noise and signals from other sources can’t leak in. The signal path is now almost non-existent, so there are no wires to pick up noise.

Prima Luna chose 12AU7 tubes because there are more factories around the world making great ones today than any other tube, so you can try them and see if you prefer their "color." In addition, because 12AU7's have always been a popular tube, there are tens of thousands of vintage new-old-stock 12AU7's available everywhere from the greatest factories like Telefunken, Mullard, Amperex, Cifte, Siemens, and more. Tons of them. If you haven't "Tube Rolled," it's a gas, and how you get that last 10% of PERFECT tonal balance to YOUR tastes.


You spend a lot of money on interconnects. So why have the signal go right from the RCA jacks or speaker terminals into circuit boards with copper traces so thin you can hardly see them? What’s high-end about that? PrimaLuna employs Point to Point Wiring on all products. The entire signal path, including resistors and capacitors, is painstakingly hand wired with heavy-gauge cable by craftsman.

SmartGain Design
A preamplifier is typically not required to add any gain to your system when you are using it. It is usually lowering gain from the source you are listening to. The number one complaint from audiophiles about preamp performance is noise. So why is it that so many manufacturers design preamps with 20 to 27dB of gain? And you wonder why there is "hiss", and why tubes go noisy or microphonic? PrimaLuna preamps use SmartGain. With a gain specification of only 12dB, you will find your PrimaLuna preamp is as quiet as a church mouse. If tubes are less than perfect, you may never know it because they are not amplifying as "loud". High efficiency speaker owner's rejoice!

Each input has a circuit designed to present a perfect 100K ohm input impedance to the components you are plugging in, assuring you that every piece of gear you listen to will sound its best.

Inputs 4 Pair RCA +1 Pair HT bypass
Outputs 2 RCA Preamp Outs 1 Pair RCA Fixed Tape Out
Gain 12 dB
Freq. Response (3dB) 4Hz - 85kHz
THD Less than 1% at full power
S/N Ratio 109 dB unweighted
Input Sensitivity 200mV
Input Impedance 100k Ohms
Output Impedance 2800 Ohms
Power Consumption 46 Watts
Standard Tube Compliment 4 - 12AU7
2 - 5AR4
Dimensions > 368mm x 203mm x 393mm
Weight >17kgs 


Contact Len Wallis Audio

Address: 64 Burns Bay Road,
Lane Cove NSW 2066,
Telephone: (02) 9427 6755