PrimaLuna® ProLogue Two
PrimaLuna® ProLogue Two
Herman van den Dungen: PrimaLuna in Italian language is "First Moon". My grandfather was the
first "Herman". My grandmother, an aristocratic lady in a small Dutch village, had a special name for
her husband: "Maantje", which means Little Moon (which is now also the name of our small dog),
van den Dungen. The people in the village adopted that name, and having a strong accent, they soon
called him "Maontje" van den Dungen. My father's first name was Cor, but in the village it was of
course "Cor from Maontje van den Dungen". I was of course "Herman from Cor from Maontje van
den Dungen" …… etc. That's why I thought of First Moon as a brandname and that's why the logo is
how it is ……
Loris Arrigucci: PrimaLuna believe it or not ... I discovered a small town located 50Km north of
Milano called Primaluna!!! Please get yourself a map from Italy. You'll find Primaluna town near the
upper-right corner. It is located 50Km north of Milano near the Lake of Como. This should eliminate
every doubt regarding "italian" origin of Primaluna name. I've read the "history" section of the
Primaluna village web site and found the following (literally translated):
PrimaLuna® ProLogue Two
ProLogue Two
Integrated Amplifier
One probable interpretation of the name of the village comes from latin "Primum Lumen", which
means "First Light" of Christianism, since the very first evidence of Christianism in this region dates
495 Annus Domini. "First Light" translates into "Prima Luce" in Italian and this seems very interesting
to me: PrimaLuce (FirstLight) is the first light that we, hi-fi lovers with small budgets, can see in this
world of darkness populated by way too expensive esoteric gears ……
Please contact us for registering your PrimaLuna ProLogue Two amplifier. We will keep you updated of
upgrades or any other information related to your amplifier. If you wish to comment on your PrimaLuna
ProLogue Two amplifier, please do. If you want to send us a review of your experience with the
amplifier, you are more than welcome to. If you have any technical questions, please don't hesitate to
contact us. We thank you upfront for your time and attention.
Local distribution:
Worldwide distribution:
Durob Audio BV
P.O. Box 109
5250 AC Vlijmen
The Netherlands
Email: [email protected]
Serialnumber ...........................................................
PrimaLuna® ProLogue Two
PrimaLuna® ProLogue Two
Warranty Information
Table of Contents
Thank you
Two-year limited warranty
Six-month warranty on stock vacuum tubes
Warning - Package Contents - Initial Setup
Terms & Conditions
Inputs & Controls
Adaptive AutoBias™ - PhonoLogue MM Option
Tube Basics
Fuse Protection
Warranty Information
1. Limited to original purchaser. This warranty is for the sole benefit of the original purchaser of
the covered product, and may not be transferred to a subsequent owner.
2. Conditions & Limitations. This warranty is subject to conditions and limitations, as follows. This
warrantly is void and inapplicable if the product has not been used in accordance with the
instructions found elsewhere in this manual, or if it has been misused, abused, damaged by
accident or neglect, or in transport once in possession of purchaser. The warranty is also void if
the product has been tampered or has been repaired or modified by anyone other than Durob
Audio BV or its specifically authorized representatives.
3. Remedy. If this product contains material, manufacturing, or workmanship defects, it must be
packed in orginal packaging and returned to Durob Audio BV or its authorized representative via
insured freight, at the owner's expense. Returned products must be accompanied by written
description of the defect, and a return authorization number (available from Durob Audio BV or the
authorized representative via e-mail). Upon receipt of the defective product, Durob Audio BV or
the authorized representative agrees to repair the product without charge for parts (except
vacuum tubes if the unit is more than 6 months old), or labor. The product will then returned via
prepaid, insured freight, with carrier at the sole determination of Durob Audio BV or the authorized
representative. This constitutes the purchaser's sole remedy.
4. Design change. Durob Audio BV and its partners reserve the right to modify their products or
change specifications at any time without obligation or liability to previous purchasers.
5. Miscellaneous. Any implied warranties relating to the above product shall be limited to duration of
this warranty. This warranty does not extend to any indentical or consequential costs or damages
to purchaser or third-parties. Our liability will be no more than the amount you paid for the product
that is the subject of a claim. This is the maximum amount for which we are responsible. This
warranty gives you specific legal rights. You may also have other rights which vary from country to
country and state to state.
Copyright Durob Audio BV - 2005. All rights reserved.
Reproduction in whole or part of text, logo, graphics or schematics is strictly forbidden
without permission, in writing, of Durob Audio BV
The information in this manual is subject to change without further notice.
PrimaLuna® ProLogue Two
PrimaLuna® ProLogue Two
Some tips:
We would like to thank you for choosing our PrimaLuna ProLogue Two vacuum tube integrated
amplifier as the heart of your music system. The ProLogue Two is the second member of a new family
of affordable, high-quality tube products. The designers and builders of the PrimaLuna equipment all
have a long history in high-end audio. We feel that it's time to offer a range of affordable audio
instruments that can easily compete with today's most expensive brands.
No output. Power is on, but power LED is off and tubes do not light up.
Mains fuse is out. Replace fuse as per instructions on page 9.
No output. Power LED is on and tubes do light up normally.
Plate fuse may be out. Replace fuse as per instructions on page 9.
If the new fuse goes out immediately after replacement, contact us for further assistance.
Noise coming from one channel.
Noisy tube. First swap the 12AX7 tubes left to right. If noise follows tube swap, than you have
found the problem tube. If noise does not follow, swap the 12AU7 tubes left to right.
Hum coming from one channel.
Possible bad output tube. Swap the EL-34 tubes in pairs from right to left. If hum follows the swap,
swap the far left and far right tubes. If the hum returns to the original problem channel, you have
found the problem tube. If not, swap the inside EL-34 tubes left to right.
We firmly believe that our quality level will be a difficult standard for other products in the market to
This PrimaLuna ProLogue amp features:
Noise/distortion coming from both channels.
Tubes may be in need of replacement. Read page 8 for tube basics and replacement options.
If you try these possible solutions and problems persist, contact us or your local distributor for further
Hand-made construction with the finest point-to-point wiring, using workmanship that is equal to or
better than any product you can buy at any price.
A heavy gauge steel, fully vented chassis with five coats of finish. Each coat is hand-rubbed and
Premium parts: toroidal transformer for power supply; custom designed -in conjunction with one of
the most prestigious transformer designers in the USA- encapsulated output transformers for
lowest hum; wide bandwidth for great bass and extended highs; ceramic tube sockets; ALPS
volume control; Nichicon and Solen capacitors; superfast Philips-diode-circuitry; gold-plated
heavy duty WBT style speaker terminals; gold-plated, panel-mounted input jacks.
SoftStart™ circuit for extended life of sensitive components, plus a reduced chance of tube failure
from thermal shock.
Adaptive AutoBias™ exclusive to PrimaLuna, this circuit monitors and smoothly adjusts bias
constantly and instantly, reducing maintenance and increasing performance due to the dramatic
reduction in distortion.
Tube plate fuse to protect the amp output stage. Other amplifiers might need a trip to the shop if a
tube fails; not this one- just plug in a new tube, fuse, and go.
Premium tubes are available from us and other parties if you wish to upgrade. In USA, Upscale Audio's
inventory of New Old Stock tubes is the largest you can find. Elsewhere, independent suppliers can
assist you to make your best choice.
We hope that the PrimaLuna ProLogue Two amplifier will make you want to follow our next steps in
expanding this new range of products. If you have any questions or comments, don't hesitate to
contact us. You can also share your thoughts with others at or other review
sites. On the website you will find links to these and other websites. Our prices are
kept low by using word-of-mouth and customer feedback, and we would appreciate hearing what you
have to say about our product. If you need service during or after the warranty period, contact us.
Thanks again for your support!
Ricardo Franassovici
Herman van den Dungen
PrimaLuna® ProLogue Two
PrimaLuna® ProLogue Two
Frequency Response
S/N Ratio
Input Impedance
Fuse Protection
40 Watts per channel
20Hz - 30 kHz +/- .5 dB
0,25% @ 1W; less than 1% up to full power
89 dB
65 kOhm
Input Sensitivity
240 mV (for rated power at maximum volume setting)
Maximum Gain
37,5 dB
Power Consumption
300 Watts
Net Weight
37.5 lbs / 17 kg
Shipping Weight
41.9 lbs / 19 kg
15.5" x 11" x 7.5" / 395 mm x 280 mm x 190 mm (L x W x H)
Shipping Dimensions
18.3" x 15" x 12" / 465 mm x 380 mm x 305 mm (L x W x H)
Tube Complement
A note on fuses: If "someone who knows" tells you to wrap fuses with aluminium foil to avoid wasting
money on new ones, it's best not to take his advice. Fuses are safety valves. They should always be
replaced with the exact same value and type.
Warning: Never attempt to check or replace a fuse while the amp is plugged in. Turn it off and unplug
all speakers, components and AC cords before continuing. Wait 10 minutes to let tubes cool down and
the circuit to fully discharge.
Plate Fuse:
The plate fuse is located inside the amp, on top of the Adaptive AutoBias™ board. To replace it,
remove the bottom plate using a Phillips #2-type of screwdriver. The fuse is located in a small plastic
case on the end of the Adaptive AutoBias™ board. Refer to the pictures on this page. Remove the top
cover. The fuse will be held on by the cover. Remove it by twisting the fuse out of the holder. Replace
with a 1Amp slow blow 5 x 20 mm fuse. The cover will snap back into place. Re-install bottom plate of
the amp.
4 pairs RCA
4 & 8 Ohm Speaker Taps
4 x KT-88
2 x 12AX7
2 x 12AU7
Mains Fuse:
The mains fuse is located on the rear of the amplifier, just below the power
cord socket (see picture on this page). The fuse rating is 5Amp slow blow 5 x
20mm for 100-120VAC and 3Amp slow blow 5 x 20mm for 200-240VAC .
Replace with the same type and value fuse! The fuse holder can be snapped
out using a small slotted flat blade screwdriver.
PrimaLuna® ProLogue Two
PrimaLuna® ProLogue Two
Tube Basics
The 12AX7 and 12AU7 tubes will have a life of about 5,000 to 10,000 hours. The lives of powertubes
are more difficult to predict. This also depends on how "gently" or "roughly" you use your amplifier. In
general -under normal conditions- you can say between 2,000 and 3,000 hours.
To prevent serious injury, electrical shock or fire:
Here are some tips on using tubes:
Do not use treatments on tube pins or in sockets.
If you decide to experiment with other tube types, it's best not to swap tubes in and out repeatedly,
as you never want to cycle amplifiers on and off rapidly. They should be left off for at least five
minutes. Further, every time you insert a tube, you stand a chance of loosening the tube sockets.
It's okay to have fun, and we support that, but don't go crazy and swap tubes in and out twenty
times in a day.
Do not leave the amplifier on 24 hours a day. Just a short warm-up is required for the PrimaLuna
to get into its groove.
Break-in yields improvements. Every tube, when new, needs to be left alone for a little while. So,
when your amplifier is new, or when you re-tube it, it may take a little time to settle in. There is
however no fixed "time rule" for break-in.
Please note that tubes can vary electrically, and by plugging in the wrong type of tube (i.e. 6922
for a 12AX7) you can damage the amplifier and void your warranty.
Do not operate with bottom plate removed.
Keep away from rain and moisture.
Always disconnect all cable connections to and from amplifier before changing fuses and/or
Do not replace fuses with any fuse other than the same type and rating as used by the factory.
Do not replace tubes without reading instructions.
Do not replace fuses or tubes if you have any doubt about your ability to do so. We accept no
responsibility for any personal or material damage due to incompetent use or users.
Package Contents
ProLogue Two Integrated Amplifier
Power Cord
This Owner's Manual
White Gloves
1 pair
Tube Complement
4 x KT-88
2 x 12AX7
2 x 12AU7
Main Fuse
1 x 5Amp slow blow 5 x 20mm for 100-120VAC or
1 x 3Amp slow blow 5 x 20mm for 200-240VAC
Plate Fuse
1 x 1Amp slow blow 5 x 20 mm
Common replacements:
12AX7: ECC83, ECC803S, E83CC, 7025, CV4004. You can also use a 5751, but please note that
the 5751 is a lower gain tube than a 12AX7 and the sound will be altered.
12AU7: ECC82, ECC802S, E82CC, 5814, 6189, CV4003
KT-88: 6550, KT-90. You may also use EL-34, 6L6GC, 7581A and KT66 though power will drop
Initial Setup
Carefully remove the ProLogue Two from its packaging. Use the white gloves to prevent
fingerprint smudges.
Remove the tube cage by carefully pulling it up and away from the amplifier.
Remove the protective foam surrounding the tubes.
Tubes are already installed. Check that each tube is firmly seated in its socket. Use gloves.
Replace cage back in its place if desired.
Check to see the power switch is off (down).
Connect each source to the corresponding plugs.
Connect your speaker wires, positive to positive, negative to negative. This unit is non-inverting.
Plug the powercord in the wall socket and in your amplifier.
Switch the amplifier on.
The tubes will be warmed up and ready to use in about 30 seconds.
Topview picture of ProLogue Two
PrimaLuna® ProLogue Two
Inputs and Controls
PrimaLuna® ProLogue Two
Front Panel
Adaptive AutoBias™
Exclusive to PrimaLuna, this circuit monitors and smoothly adjusts bias constantly and instantly. The
genius of this design is that the Adaptive AutoBias™ actually improves the overall sound quality and
performance of the amp. Between 12 and 30 Watts, measured distortion levels drop by over 40%. In
addition, tubes do not have to be matched, and there is no bias (re-)adjustments needed, ever.
Furthermore, the PrimaLuna is equipped with Soft-start™ , which brings the amplifier on line slowly to
prolong the life of internal components components, including the tubes. This makes the PrimaLuna a
joy to own and operate.
While matched tubes are not a requirement, it is still recommended if you want to get the very best
results. You can get the very best in replacement tubes as well as rare vintage NOS (New Old Stock)
tubes from us and other parties if you wish to upgrade. In the USA, Upscale Audio's inventory of New
Old Stock tubes is the largest you can find. Elsewhere, independent suppliers can assist you to make
your best choice.
PhonoLogue phono stage (optional)
The front panel of the PrimaLuna models is made from machined aluminium, finished to match the
blue metallic chassis. The volume is controlled with the knob on the left, source selection is on the
right. Your sources are labelled CD, Tuner, Aux 1 and Aux 2, but all are interchangeable. There is no
functional difference between the inputs. The power switch is located on the left side of the amp, just
behind the front plate.
Rear Panel
Your ProLogue Two integrated amplifier comes without a phonostage, but we have a high quality
optional internal phono stage available. The PhonoLogue phono stage can be installed at any time by
your dealer or any qualified person.
The PhonoLogue MM phono stage with RIAA equalization, requires no extra plugs or connectors. It fits
(by soldering) on the existing RCA's of one of the inputs. It provides superior sound quality on a tiny
footprint. We use Surface Mount Technology implementation for shortest signal paths as well as
minimum parasitic capacitances and inductances. Excellent parts throughout, selected on sound
quality as first priority: miniature film capacitors, minimelf resistors, superior opamp for highest
accuracy, lowest noise, highest speed and most robust drive capabilities into the RIAA correction
stage, resulting in a very detailed, open and lifelike sound from any LP record. Low impedance
electrolytics, super low-noise powersupply. Dimensions: small as a big stamp!
Looking at the rear panel, you will note you have four inputs and the pair of speaker terminals. Attach
the positive (+) from your loudspeaker to the 4 or 8 ohm terminal that most closely matches the
average impedance of your loudspeakers according to their manufacturer's specifications. The
negative (-) from your loudspeaker attaches to the 0 Ohm terminal.
Tip: Experiment using the 4 or 8 Ohm positive (+) terminal to find what's the best match with your
speakers. Do not make any assumptions. Trust your ears.
Input Impedance:
Frequency Response:
RIAA accuracy:
Overload Margin:
Harmonic Distortion & noise:
50 kOhm
42dB (127x)
10Hz - 50kHz
<0,5B 20Hz - 20kHz
>20dB rel 5mV
3,2 x 3,8 cm (1.26" x 1.5")
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