PrimaLuna DiaLogue Premium User manual

PrimaLuna®
DiaLogue Premium
Poweramplier
Serialnumber
...........................................................
PrimaLuna®DiaLogue Premium
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):
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 DiaLogue Premium Poweramplifier. We will keep you
updated of upgrades or any other information related to your amplifier. If you wish to comment on your
PrimaLuna DiaLogue Premium Poweramplifier, 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.
PrimaLuna®DiaLogue Premium
Local distribution: Worldwide distribution:
Durob Audio BV
P.O. Box 109
5250 AC Vlijmen
The Netherlands
Email: [email protected]
Website: www.primaluna.nl
DiaLogue!

2 15
THANK YOU!
We would like to thank you for choosing our PrimaLuna DiaLogue Premium vacuum tube
Poweramplifier as part of your music system. The DiaLogue Premium Poweramplifier is the third
member of the new DiaLogue Premium series of affordable, high-quality tube products. In fact it is a
combination of our DiaLogue Premium Stereo Amplifier and our DiaLogue Premium Mono Amplifier.
Both their functionality in one new model. The designers and builders of the PrimaLuna equipment all
have a long history in high-end audio. We feel we have shown with PrimaLuna that we are able to offer
a range of affordable audio instruments that can easily compete with today's most expensive brands
and assure you we will continue that way. We firmly believe that our quality level will set the bar at a
difficult height for other products to match.
This PrimaLuna DiaLogue Premium Poweramplifier features:
• 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, fully-vented steel chassis with a five coat finish. Each coat is hand-rubbed and
polished.
• Premium parts that include a toroidal transformer for power supply; custom designed -in
conjunction with one of the most prestigious transformer designers in the USA- encapsulated
output transformers the quality of which fits nicely between standard DiaLogue and DiaLogue
transformers; wide bandwidth for great bass and extended highs; ceramic tube sockets; ALPS
volume control; Nichicon, Solen, Swellong and DuRoch capacitors; superfast
Philips-diode-circuitry; gold-plated heavy duty WBT style speaker terminals (all speaker
connectors are solid shaft, without hole, for better conductance, better sound and higher
reliability); gold-plated panel mounted input jacks.
• SoftStart™ circuit for extended life of sensitive components, plus a reduced chance of tube failure
from thermal shock.
• A new generation 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. It comes with a new extensive output stage protection circuitry
with +B relay to protect output transformers, resistors and high voltage power supply in case a
tube fails. In all DiaLogue Premium Amplifier models the new generation Adaptive Auto Bias
Board comes with our new BTI™ circuit. BTI™ stands for Bad Tube Indication (by LEDs), making
tube-life again a bit easier.
• All DiaLogue Premium Amplifiers come with an EL34/KT88 bias switch. This means that with the
flip of a switch you can choose for the optimum bias setting for EL34 type of tubes or KT88 type of
tubes. No hassle with screwdrivers, no messing around with meters etc. Just switch tubes, switch
bias!
• This DiaLogue Premium Poweramplifier comes also with a mono/stereo switch giving it the
functions of both the DiaLogue Premium Mono Amplifier as well as the DiaLogue Premium Stereo
Amplifier.
PrimaLuna®DiaLogue Premium
Warranty Information
Two-year limited warranty
Six-month warranty on stock vacuum tubes
Terms & Conditions
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
warranty 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 with 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 original 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.
PrimaLuna®DiaLogue Premium

14 3
• No more 12AX7 tubes in the DiaLogue Premium range of products. Instead of a 12AX7/12AU7
combination in each channel, we use a double 12AU7 combination. Lower distortion levels, higher
level of sound quality. Distortion levels in the first stage have dropped with a factor of 5 at low
levels to at least 20 at higher levels, above 1V.
• All new PrimaLuna PTP™ (Power Transformer Protection) circuit. When the power transformer
overheats due to environmental circumstances, overloading or some problem in the unit, an
internal thermal switch breaks the primary, allowing the unit to cool down before harm is done.
After it’s cooled, contact is restored and if nothing is broken, the amp will repower and function
properly.
• All new PrimaLuna OTP™ (Output Transformer Protection) circuit which further protects the
amplifier.
• LIVE side of AC input connector indicated by aluminium color screw.
PrimaLuna SilverLabel tubes are pre-selected by us following our simple 60 out of 100 rule (PTS™ -
Premium Tube Selection) and as such, are already “special” when compared to other standard tubes
on the market. Additionally, for certain models we have our GoldLabel tubes, which are available from
us and several other parties if you wish to upgrade. In the USA, Upscale Audio's inventory of New Old
Stock tubes (which is another thing you might want to experiment with) is the largest you can find.
Elsewhere, independent suppliers can assist you to make your best choice.
We hope that the PrimaLuna DiaLogue Premium Poweramplifier 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 www.audioreview.com or other review
sites. On the www.primaluna.nl website you will find links to these and other websites. We keep our
prices low by relying on word-of-mouth and customer feedback, and we would appreciate hearing what
you have to say about our product. Finally, if you need service during or after the warranty period,
please don’t hesitate to contact us.
Thanks again for your support!
Herman van den Dungen
DUROB AUDIO BV
Specifications
Power ................................................................................................ Stereo 35 Watts per channel; Mono 70 Watts per channel
Frequency Response ......................................................... stereo 9Hz - 130kHz -3 dB; mono 7Hz - 140kHz -3 dB
THD with AABB ............................................................................................................................................................... less than 1% at rated power
S/N Ratio...................................................................................................................................................................................................... 75 dB flat; 92 dB Wtda
Input Impedance .....................................................................................................................................................................................................................100 kOhm
Input Sensitivity ............stereo 600 mV, mono 900 mV (for rated power at maximum volume setting)
Maximum Gain ....................................................................................................................................................................................................................................... 28 dB
Power Consumption ......................................................................................................................................................................................................... 255 Watts
Net Weight ............................................................................................................................................................................................................... 49.5 lbs / 22.5 kg
Shipping Weight................................................................................................................................................................................................ 58.4 lbs / 26.5 kg
Dimensions ..................................................................... 15.4" x 14.4" x 8" / 390 mm x 365 mm x 202 mm (L x W x H)
Shipping Dimensions ................................. 22.7" x 18.4" x 12" / 577 mm x 468 mm x 305 mm (L x W x H)
Inputs ...................................................................................................................................................... 1 pair Stereo RCA; mono: 1 single RCA
Outputs............................................. stereo: 4, 8 & 16 Ohm Speaker Taps; mono: 2, 4 & 8 Ohm Speaker Taps
Tube Complement ..................................................................................................................................................................................................................4 x EL34
6 x 12AU7
As of July 1, 2006 all PrimaLuna products are manufactured with RoHS compliant parts.
PrimaLuna®DiaLogue PremiumPrimaLuna®DiaLogue Premium
All PrimaLuna products come with PrimaLuna SilverLabel tubes which are pre-selected
by us following our simple 60 out of 100 rule (PTS™ - Premium Tube Selection) and as
such, are already “special” when compared to other standard tubes on the market.
Additionally, for certain models we have our GoldLabel tubes, which are available from us
if you wish to upgrade.

4 13
Table Of Contents
Thank You 2
Warning - Package Contents - Initial Setup 5
Inputs & Controls 6
EL34/KT88 Switch - UT-TR switch 7
Remote 8
Adaptive AutoBias™ - Protection Circuits 9
Tube Basics 11
PTS™ Premium Tube Selection™ 12
Troubleshooting 13
Specifications 14
Warranty Information 15
Copyright Durob Audio BV - 2014. 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®DiaLogue Premium
Troubleshooting
Some tips:
• No output. Power is on, but power LED is off and tubes do not light up.
AC cable makes bad connection in IEC connector. Please check.
• No output. Power is on, but power LED is off and tubes do not light up.
PTP™ protection may have switched off power transformer. If so, the amplifier will switch on again
after internal temperature of power transformer returns to normal. Overheating might be caused
by higher environment temperature than normal or heavy use.
• BTI switch-off. BTI switched off the high voltage supply to the power output tubes. This can
happen when one (or more) output tube(s) draw(s) significantly more current than normal, like
what can happen when a loudspeaker terminal is short circuited with volume turned up. Or, in
case of an internal output tube failure, the BTI™ circuit understands that there is a new situation
which can cause harm to the amplifier or the loudspeaker, and the high voltage power supply to
the output tubes is interrupted as a protective measure. To reset, switch the amplifier’s power off
for at least two minutes, then switch back on. Of course this should only be done after the cause
of the failure has been identified and resolved. Switching the power back on too early can fool the
BTI circuit into acting as though the problem has not been totally resolved and it may put the amp
back into protection mode again. So be sure to give it enough time to reset.
• 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.
• Noise coming from one channel in case of use as stereo amplifier. The easiest is to try a full set of
new tubes and see if the problem disappears or stays. If that is not possible try to find if there is
maybe one problematic tube.
Noisy tube. First swap the two inner 12AU7 tubes left to right. If noise follows tube swap, than you
have found the problem tube. If noise does not follow, swap the two outer 12AU7 tubes left to
right.• Hum coming from one channel. Possible bad output tube. Swap the output 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 output
tubes left to right. If still you did not find a problematic tube, you retry the same with the power
tubes.
• Noise/distortion coming from both channels in stereo mode.
Tubes may be in need of replacement. Read page 10 for tube basics and replacement options.
• In case you use the amplifier as mono amplifier and have a hum problem, try to replace all tubes
by a new set and see if the problem goes or not. In case you want to try to find the possible one
problematic tube, connect and use the amplifier in stereo mode and follow the earlier described
procedure.
If you try these possible solutions and problems persist, contact us or your local distributor for further
investigation.
PrimaLuna®DiaLogue Premium

5
Warning
To prevent serious injury, electrical shock or fire:
• 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
tubes.
• 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
DiaLogue Premium Poweramplifier ....................................1
PowerCord ...............................................................................................................1
This Owner's Manual .................................................................................1
White Gloves .........................................................................................................1 pair
Tube Complement..........................................................................................4 x EL34
6 x 12AU7
Main Fuse ..................................................................................................................1 x Littelfuse® 218 Series 2.5A Slo-Blo® 5 x 20 mm
fuse for 100-120VAC and Littelfuse® 218 Series 1.25A
Slo-Blo® 5 x 20 mm fuse for 200-240VAC
Heavy Metal UL-TR Remote Control ..............................1
Initial Setup
• Carefully remove the DiaLogue Premium Poweramplifier 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 output of preamp with input of power amp.
• Connect your speaker wires, positive to positive, negative to negative. This unit is non-inverting.
• Plug the power cord into the amplifier, then into the wall socket.
• Switch the preamplifier on and wait for 1 minute to stabilize the circuit.
• Switch the power amplifier on.
• The tubes will be warmed up and ready to use in about 60 seconds.
PrimaLuna®DiaLogue Premium
12
PTS™ - Premium Tube Selection™
Our “standard” PrimaLuna SilverLabel tubes are pre-selected using our simple 60 out of 100 rule and
as such, are already “special” when compared to other standard tubes on the market. Out of 100 tubes
which have passed the final quality control from the manufacturer, we are allowed to select and keep
the 60 best pieces. The other 40, which are in no way defective (these just do not belong to the best
60), go back to the manufacturer and are used to supply other clients.
Additionally, we keep an eye on all tubes still manufactured today and if special, high quality tubes
become available, we consider them as candidates for our GoldLabel tubes. Normally these are tubes
which are still in production—we don’t want to offer minor quantities of N.O.S. (New Old Stock) tubes
as PrimaLuna GoldLabel tubes.
Currently we have available 12AX7 and 12AU7 GoldLabel tubes. Please feel free to inquire.
PrimaLuna®DiaLogue Premium

Inputs & Controls Front Panel
PrimaLuna’s front panels are made from machined aluminum, finished to match the black/blue metallic
chassis. No controls are available from the front. The power switch is located on the left side of the
amp, just behind the front plate, the EL34/KT88 switch on the right side of the amp, just behind the
front plate.
Rear Panel
Looking at the rear panel, you will note the input section and speaker terminals. The input
section can be used as mono input or stereo input. The speaker terminals also can be used as mono or
stereo output(s). Make sure that the mono/stereo switch is in the correct position. Do NOT use this
switch while the amplifier is switched on. If the switch is in mono position, use the input and output
connections marked “mono”. If the switch is in stereo position, use the input and output connections
marked “stereo”.
Used as a stereo amplifier, connect the positive (+) from your speaker to the 4, 8, or 16 Ohm terminal on
the back of the amplifier. As a monoblock, connect to the 2, 4, or 8 Ohm terminal on the right channel.
Use the terminal that most closely matches the average impedance of your loudspeaker. Experience
shows many customers use the tap that is one step below the nominal speaker impedance, so for an
8 Ohm speaker, they may use the 4 Ohm tap. Experiment and trust your ears!
The negative (-) from your loudspeaker attaches to the 0 Ohm terminal.
Some preamplifiers invert the audio signal. In that case you might want to connect the positive(+) wire of
your loudspeaker cable to the 0 Ohm terminal of the DiaLogue Premium Mono Amplifier, and the
negative (-) wire to the 2, 4, 8 or 16 Ohm terminal; do so for both channels. When in doubt, consult the
preamp's manual or ask the manufacturer of the preamp. Our PrimaLuna preamplifiers are
non-inverting.
PrimaLuna®DiaLogue Premium
611
PrimaLuna®DiaLogue Premium
DiaLogue Premium Poweramplifier
Tube Basics
The 12AU7 tubes will have a life of about 5,000 to 10,000 hours. However, the life span of power tubes
is more difficult to predict. It greatly depends on how "gently" or "roughly" you use your amplifier. In
general, under normal conditions, you can figure between 2,000 and 3,000 hours.
Here are some other guidelines about 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.
To do so requires you to turn your amplifier off and on and 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 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, allow 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 you can
damage the amplifier and void your warranty.
Common Replacements:
• For 12AU7: : ECC82, ECC802S, E82CC, 5814, 6189, CV4003
• For KT88: 6550, KT90, KT120, KT150 (cage does not fit with KT150s installed).
You may also use EL34, 6L6GC, 7581A and KT66,though power will drop slightly.
• For EL34: 6CA7, E34LS, E34L. You may also use 6L6GC, 7581A and KT66 though power will
drop slightly.
Top view of DiaLogue Premium Poweramplifier
Some tubes and tube sockets
have a “center key” which
must line up! If you misalign
them and use brute force, you
will damage important and
expensive parts of your
amplifier!!

10 7
EL34/KT88 Switch
The DiaLogue Premium Poweramplifiers—as well as the Premium Integrated Amplifier—come with
an EL34/KT88 bias switch. This means that by the flip of a switch you can choose the optimum bias
setting for EL34s or KT88s. No hassle with screwdrivers, no messing around with meters etc. If you
swap tubes, simply flip the switch for optimum bias!
And should you use the “wrong” bias setting for the tubes in use, don’t worry. It just means you did
not choose the “optimum” bias setting as decided by the PrimaLuna design team. Some PrimaLuna
owners even like to “play” with this switch to see what is the optimum bias setting for their
circumstances and some go even further and play with this switch while having a mix of EL34 and
KT88 within one channel. All is possible due to the PrimaLuna Adaptive AutoBias Circuit.
Ultralinear – Triode Switching
Your DiaLogue Four amplifier affords you the opportunity of switching between Ultralinear and
Triode modes by remote control. You need not turn off the amp to do so; you can switch while the
unit is operating. Although a faint click might be heard through your speakers, it is in no way
harmful.
Your DiaLogue Four always starts in Ultralinear mode when powered up. Centered behind the front
panel is a two-color LED which indicates the mode in which the amp is functioning:
Red—Ultralinear; Green—Triode.
The choice between Ultralinear or Triode modes is a matter of taste, influenced by your speakers
and the recording.
Ultralinear Mode
The term ultralinear applies quite literally here. The design exerts a tighter grip on the speakers and
produces music more likely to be described as accurate, dynamic, with great inner detail. The top
and bottom end take on more “pop” and excitement.
Triode Mode
Take your KT-88 or EL-34 and wire it like a 300B! Triode sound is best described as warmer on top
and bottom, a little compressed, with the midband now slightly more pronounced. Your shoulders
drop as the sound is more relaxed. In absolute terms it will not play as loud as maximum power
drops by roughly half compared to Ultralinear.
So Which Is Better?
Decide with your ears but we will leave you with this thought: On the surface it would appear that if
you wanted to play music louder, you would use the higher-powered Ultralinear mode; conversely,
you would use the Triode setting for soft listening. Not always true! At low listening levels, you may
need the “pop” that Ultralinear provides for top and bottom extension so the music sounds full. At
higher listening levels, Triode operation will start to “compress” and allow you to crank it up more
with less fatigue. The point is: have fun with it and never let people tell you what sounds right.
PrimaLuna®DiaLogue PremiumPrimaLuna®DiaLogue Premium
OTP™ - Output Transformer Protection™
While rare with PrimaLuna products, you might sometimes “lose” an output transformer, especially if
you forget to switch off your equipment while changing something in your system. With our new Output
Transformer Protection circuit we intend to minimize the chances of such bad luck. OTP™ as it’s called
only becomes “active” only when needed. Otherwise, this circuit is totally out of the signal route.
Fuse Protection – Traditional
A note on fuses: If "someone who knows" tells you to wrap fuses with aluminum 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.
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 1 x Littelfuse®218
Series 2.5A Slo-Blo®5 x 20 mm fuse for 100-120VAC and Littelfuse®218 Series
1.25A Slo-Blo®5 x 20 mm fuse 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.

8 9
PrimaLuna®DiaLogue Premium PrimaLuna®DiaLogue Premium
AAB™ - Adaptive AutoBias™
Our PrimaLuna exclusive Adaptive AutoBias™ circuit monitors and smoothly adjusts bias constantly
and instantly, reducing maintenance and increasing performance due to the dramatic reduction in
distortion. 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. The new generation Adaptive AutoBias™ circuit comes with a new extensive output
stage protection circuitry with +B relay to protect output transformers, resistors and high voltage power
supply in case a tube fails.
PrimaLuna Special Protection Circuits”
Soft-start™
Furthermore, the PrimaLuna Adaptive AutoBias™ circuit is equipped with Soft-start™, which powers
the amplifier up slowly to prolong the life of internal components, including the tubes. This makes the
PrimaLuna a joy to own and operate.
BTI™ - Bad Tube Indication™
In all DiaLogue Premium Amplifier models the next generation Adaptive Auto Bias Board comes with
our new BTI™ circuit. BTI™ stands for Bad Tube Indication (by LEDs), making tube-life again a bit
easier. The BTI™ circuit is totally inactive during normal operation. However when one (or more)
output tube(s) draw(s) significantly more current than normal for a couple of seconds, such as when a
loudspeaker terminal short-circuits with volume turned up, or in the case of an output tube failure, the
BTI™ circuit “reads” the changes as a potential threat and as a protective measure, interrupts the
power supply. To reset, simply turn the power off and after two minutes, turn back on. HOWEVER, you
do not want to repower the unit until the cause of the failure has been identified and resolved.
Switching the power back on too early also can fool the BTI circuit into acting as though the problem
has not been totally resolved and it may put the amp back into protection mode again. So be sure to
give it enough time to reset.
PTP™ - Power Transformer Protection™
PrimaLuna has an impeccable reputation for reliability… maybe the best ever in the tube industry. Still
we’re constantly searching for ways to improve on what is arguably the best. Our PTP™ circuit is a
thermal switch built into the power transformer. If for whatever reason the (internal) temperature of the
power transformer becomes too high, AC is simply switched off. After cooling down, and if nothing is
wrong with the amplifier, it will start functioning again as normal. If the problem occurs again (or
persists) the unit should be turned off and checked out by your dealer.
Remote Control
The functions of the PrimaLuna DiaLogue UL-TR Remote Control are self-explanitory. The remote
controls Triode/Ultralinear switching.
The PrimaLuna DiaLogue UL-TR Remote Control has two high quality silicon rubber rings on each end
to protect against damage of the remote control itself as well as your furniture. These rings can be
easily removed in case battery has to be replaced or if you plain just don’t like them.
In the event your remote control does not function, please check battery and if necessary, replace with
a new CR2032 model battery. To access the battery-compartment, remove the rubber rings and
unscrew the back plate. If the remote still does not function, contact your dealer for further assistance.