Trinity Power AMP User manual

Reference
Power AMP
MANUAL

THANK YOU
for purchasing a product from TRINITY Electronic Design
The TRINITY Power Amp with its outstanding architecture sets new standards so that discerning music aficionados
can finally enjoy their most beautiful recordings as if it were the true to life original
The TRINITY POWER AMP is parted in a voltage gain stage and a current gain stage with its own global feedback
The voltage gain input stage is based on 16 voltage gain blocks, which work in parallel to reduce the noise level and
to increase the linearity close to the measurement limits
The current output stage of the TRINITY Power Amp contains 16 output transistor pairs and 56 voltage regulators
Two 480W Switch-Mode-Power-Supply modules drive two low noise 20Ampere Voltage regulator, which store
enough energy in a big capacity bank
The TRINITY Power Amp is specified down to 2Ohm loads to work with all critical loudspeakers
The real power bandwidth is above 500kHz at the maximum specified load
Enjoy pure sound reproduction with our product
Sincerely Yours
TRINITY Team

Photo PA

CONTENTS
Safety Instructions 5
Scope of Supply 6
Transportation and Cleaning 6
Selecting the Power Voltage 7
Connecting and Starting 7
Wiring Up 8
Technical descriptions 9
THE FINAL MEASUREMENTS 20
Warranty 27
Support 28

SAFETY INSTRUCTIONS
1 Please read this operating manual carefully and observe all the instructions affixed to the appliance or written in
this manual
2 Install this product on a stable surface and make sure that nobody can trip over the cables
3 This product should only be connected to a power source indicated on the product If you are unsure what power
source you have in your region, please contact your local power utility
4 Never operate this product near water or with wet hands If the product comes in contact with liquids,
immediately disconnect it from the power source
5 To exclude the risk of an electric shock, please never expose the product to the rain or other source of liquid
6 In thunderstorms, do not install the product or put it into operation
7 Never attempt to open the appliance or repair it yourself If you open or remove the enclosure, you may expose
parts that are subjected to dangerous levels of voltage Any unauthorized opening of the appliance will cause the
warranty claim to become null and void
8 Do not allow children to play with electrical appliances without adult supervision Children do not always
recognize the possible risks and consequences

SCOPE OF SUPPLY
The scope of supply comprises:
•TRINITY Power AMP
•1 x Flight Case, weight: 59kg, dimension: 80cm, 60cm, 40cm
TRANSPORTATION AND CLEANING
Please only transport the parts listed in the scope of supply in the supplied flight case and use the supplied cotton
gloves when unpacking and installing the appliances to avoid scratching the enclosures
Clean the surfaces using the supplied microfiber cloth: immerse the cloth in lukewarm water containing no
detergents and then carefully wipe the surface when the cloth is almost dry
Never use chemical or aggressive detergents.

SELECTING THE POWER VOLTAGE
The implemented wide-range switched mode power supply modules allow an operation from 100Vac to 240Vac
The two fuses on the primary side are placed inside of these modules
CONNECTING AND STARTING
To install the TRINITY Power AMP, select a stable, level surface directly next to the turn table so that the connecting
cable to the tone arm is as short as possible Avoid placing the appliance in direct sunlight and never place the
modules directly next to radiators or fan heaters
Protect all supplied parts from humidity and moisture
Only wire up the components when the device is switched off

WIRING UP AND Select the Stereo/Mono Mode
1 Disconnect the Power Amp from the power source Never disconnect any wires unless the device is switched off
2 Connect the Power Amp MONO input to the audio source for Mono-bridge mode
3 Connect the Power Amp Left & Right inputs to the audio sources for stereo mode
4 To select the Stereo Mode, press the selection push button on the back of the amp
5 Connect the Power Amp to the loudspeakers Choose the red and white connectors for the stereo mode and use
the two red connectors for the Mono-bridge mode

The POWER AMP
“As no cable can improve any signal which it is passing (unless it is filtering out some other problem that should
not be there) it must be concluded that the best cable is no cable Moreover, as no amplifier can improve the
accuracy of the signal which it is passing, the only conclusion which can be drawn is that the combination of
amplifier and cable can only degrade the signal However, as we must use an amplifier and a cable, art and
science are both employed in order to minimise the inevitable degradation ”
“Loudspeakers”, Philip Newell and Keith Holland
Objectives of an ideal power amp
An ideal audio amplifier should have the following characteristics:
- Infinity Power Bandwidth
- Infinity Output Current
- Zero Output Impedance
- no Harmonic Distortions
- no Intermodulation Distortions
- no Transient Intermodulation Distortions
- no Noise
- cost nothing

Everybody will agree to design an ideal amp is impossible, but how close a design comes to these requirements
determine the real quality of the amp
The development target of the TRINITY POWER AMP was to get as close as possible to these objectives Since the
maximum output power is not a sound relevant parameter, we decided to build a moderate power amp, which is
nevertheless able to drive 2Ohm loads almost distortion free The Power Amp should have the lowest distortions,
the lowest noise, the highest power bandwidth and a huge phase margin for complex loads to avoid that the amp
declines the excellent measurement results of our TRINITY PREAMP, DAC or PHONO Stage
Like in all of our products only sound relevant parameters are the focus in our development
The signal to noise ratio should be in the range that there is no noise or hum at full volume in any kind of
loudspeakers including high efficiency horn loudspeakers
There are amplifiers on the market, which uses an error correction loops to reduce the THD like the one described
here: http://www cordellaudio com/poweramp/mosfet shtml
Such a compensation needs an additional loop and will work fine with steady state signals like a sine wave, but
music is much more complex than that and the amp has to drive a very complex load, which can have a negative
influence on such additional loops
The better way is, if the amp has no distortion at all, than there is no need to implement an additional error
correction loop. That is the reason why we have realized the loops in the TRINITY Power AMP in a “classical”
design.
Less is more.

Stability & Output Impedance
From the theory we know an amplifier is always stable on all complex loads, if the “open loop” output impedance is
zero Zero is impossible, but we can reduce the output impedance, if we use more output transistors in parallel
Therefore 168 pieces of NPN/PNP pairs are working in parallel in each of the TRINITY Power Amplifier That means
overall 336 high frequency output transistors!!!!
If we close the loop the open loop output impedance is reduced by the open loop gain to the closed loop output
impedance This closed loop output impedance determines the damping factor, which is the ratio of the speaker
impedance and the closed loop output impedance Amps with higher damping ratio can control the huge voice coils
of the bass chassis much better Figure 1 shows the simulated output impedance of a TRINITY Power Amplifier
(Edition version) The 1µOhms output impedance at 10Hz, which is related to a damping factor of almost 10 000 00
for an 8Ohm loudspeaker, is unique

Figure 1 Simulated Closed Loop Output Impedance & Damping Ratio for an 8Ohm loudspeaker

Normal Output Stage
This outstanding damping ratio is only possible with a different design of the output stage
Figure 2 shows the arrangement of the output stage of a common audio amplifier
- high over all voltage gain
- a shunt Zobel network for stability into inductive loads
- a series output inductor//damping resistor for stability into capacitive loads
- a relay for DC-offset protection
Figure 2 Normal output stage of a power amplifier

TRINITY Power AMP Output Stage
Figure 3 shows the simplified design of the output stage of a TRINITY Power AMP
- low voltage gain of 2 in the current output stage
- no shunt Zobel network
- no series output inductor/damping resistor
- no relay for DC-offset protection
Figure 3 TRINITY Power AMP output stage

THE FINAL MEASUREMENTS
All TRINITY devices are shipped with a complete measurement protocol and not with some “typical” marketing
values published on the web page or in the data sheet
What you see (in the measurement results) is what you get
The measurements are done after a burn-in of 48hours
The most of the measurements are showing the worst case, with the TRINITY Power AMP running at the maximum
input voltage and driving the lowest load resistor
By the way in stereo mode the TRINITY Power Amp can run even on 1Ohm loads!!!!

FFT Voltage Gain Stage 1kHz, 1Vrms Input Voltage,
all distortion
s
are below
-
140dB!!!!!

FREQUENCY RESPONSE of the Complete Power Amp 25Vrms_No Load_8Ohm, 4Ohm & 2Ohm,
0.5dB at 200kHz at full load, caused by the extreme low output impedance all curves lay on the top of each other

Small Signal - Frequency Response of the Current Gain Stage 3dB Corner Frequency at 7.5MHz

Small Signal - Group Delay Response of the Current Gain Stage is 29. 43ns!!!!

GAIN 25Vrms_No Load_8Ohm, 4Ohm & 2Ohm