The “Big Brother” Power Amplifier "Pinnacle AB700"

[sadik]

Hi Friends,

I am sharing my new Amplifier built with you all. Its been more than 6 to 8 months since I started this project. I have named it “Pinnacle AB700”. “AB” itself suggest its a Class AB Amplifier. I am calling it as a “Big Brother” because i had just recently made a Amplifier "Pinnacle AB200". It was rated for 250 watts RMS power @ 4 Ohms. My Amplifier is rated for 500 Watts Power @ 4 Ohms, hence i am calling this Amplifier as “Big Brother”

It can be used as a HI-FI amplifier for home use or a PA application. The Power Supply has 50-0-50 VAC @ 1200 VA rating transformer, supported with a massive power bank of total capacitance 1,20,000uf. It has total 7 Pairs of Transistors for Each Channel.

Note: With 90 Volts DC supply per rail this Amplifier is capable of delivering 700 Watts RMS power @ 4 Ohms. Hence the suffix "AB700"

Below are the specifications of same with 70 Volts DC Supply per rail
Power Output.
260W @ 8 Ohms (Per Channel)
500W @ 4 Ohms (Per Channel)
850W @ 2 Ohms (Per Channel) without any difficulty.
Frequency Response : 7Hz - 150 kHz (-3dB)
Thd : <0.05% at rated power. 20 - 20000Hz
Thd : <0.006% @ 100W, 1 kHz
Sensitivity: 1.44V rms for rated power.
Slew Rate: 95V/us
Damping Factor: >600 @ 8 Ohms (20-200 Hz)
SNR: 117 dB

A little information on built.
The Amplifier modules, Pre Amp / Buffer module as well as soft start module duly soldered and assembled on Heatsink were directly purchased from @Aniket , Soft Start module was purchased form theaudiocrafts and the fan speed controller (low speed low noise of air) was purchased from e-Bay India. I had made the Enclosure and Face-Plate (Brushed Aluminium Finish) locally. The Enclosure was designed in 3D software, the Profile was cutted on laser cutting machine and bending was done on CNC bending machine.

First Power On.
I was a bit afraid about humming issue, being such a high power amplifier with a huge EI transformer there was 99% possibility of humming noise from speakers. But then it was a surprise The Amplifier was dead silent on startup. Credit goes to @Aniket. The sound signature was superb, It was just like the Pinnacle AB200, the only difference was the Power, A High Power Amplifier with such a sweet tonal character, really impressive. to own a Branded one with such a power and tonal character may leave you with a BIG hole in your Pocket. Enough of typing now. Enjoy the Built.

The Wiring layout. Thanks to @Aniket for his guidance, The layout played a very important role to achived a dead silent amplifier.

Face Plate Aluminum treated for brush finish (There is a little defect on the first slot which can be seen in the below photo) It states you cannot have control on all errors. This was a machine error. The Plate was also cutted on CNC Laser Cutting Machine.

A rough Fitment.

Face- Plate after Silver Anodizing & Laser Engraving.

A Closeup

Final Assembly

Sadik

 

[spirovious]

l guess many FM were looking for better power and this amp can fulfill their expectations. Nice work.

 

[sadik]

l guess many FM were looking for better power and this amp can fulfill their expectations. Nice work.

Thankyou @spirovious. Yes this Amplifier is really good for Power hungry Speakers.

 

[liverpool_for_life]

Looks very nice. Congratulations! Are these designed to be neutral?

 

[sadik]

Looks very nice. Congratulations! Are these designed to be neutral?

Thanks for complement. What do you mean by the word neutral, I didn't understand that.

 

[RajithKumar]

Hi Friends,

I am sharing my new Amplifier built with you all. Its been more than 6 to 8 months since I started this project. I have named it “Pinnacle AB700”. “AB” itself suggest its a Class AB Amplifier. I am calling it as a “Big Brother” because i had just recently made a Amplifier "Pinnacle AB200". It was rated for 250 watts RMS power @ 4 Ohms. My Amplifier is rated for 500 Watts Power @ 4 Ohms, hence i am calling this Amplifier as “Big Brother”

It can be used as a HI-FI amplifier for home use or a PA application. The Power Supply has 50-0-50 VAC @ 1200 VA rating transformer, supported with a massive power bank of total capacitance 1,20,000uf. It has total 7 Pairs of Transistors for Each Channel.

Note: With 90 Volts DC supply per rail this Amplifier is capable of delivering 700 Watts RMS power @ 4 Ohms. Hence the suffix "AB700"

Below are the specifications of same with 70 Volts DC Supply per rail
Power Output.
260W @ 8 Ohms (Per Channel)
500W @ 4 Ohms (Per Channel)
850W @ 2 Ohms (Per Channel) without any difficulty.
Frequency Response : 7Hz - 150 kHz (-3dB)
Thd : <0.05% at rated power. 20 - 20000Hz
Thd : <0.006% @ 100W, 1 kHz
Sensitivity: 1.44V rms for rated power.
Slew Rate: 95V/us
Damping Factor: >600 @ 8 Ohms (20-200 Hz)
SNR: 117 dB

A little information on built.
The Amplifier modules, Pre Amp / Buffer module as well as soft start module duly soldered and assembled on Heatsink were directly purchased from @Aniket , Soft Start module was purchased form theaudiocrafts and the fan speed controller (low speed low noise of air) was purchased from e-Bay India. I had made the Enclosure and Face-Plate (Brushed Aluminium Finish) locally. The Enclosure was designed in 3D software, the Profile was cutted on laser cutting machine and bending was done on CNC bending machine.

First Power On.
I was a bit afraid about humming issue, being such a high power amplifier with a huge EI transformer there was 99% possibility of humming noise from speakers. But then it was a surprise The Amplifier was dead silent on startup. Credit goes to @Aniket. The sound signature was superb, It was just like the Pinnacle AB200, the only difference was the Power, A High Power Amplifier with such a sweet tonal character, really impressive. to own a Branded one with such a power and tonal character may leave you with a BIG hole in your Pocket. Enough of typing now. Enjoy the Built.

The Wiring layout. Thanks to @Aniket for his guidance, The layout played a very important role to achived a dead silent amplifier.

Face Plate Aluminum treated for brush finish (There is a little defect on the first slot which can be seen in the below photo) It states you cannot have control on all errors. This was a machine error. The Plate was also cutted on CNC Laser Cutting Machine.

A rough Fitment.

Face- Plate after Silver Anodizing & Laser Engraving.

A Closeup

Final Assembly

Sadik

Looks very Nice Great job Hope it's sounds great . Have u checked it with any speakers...if so what's the model , please share your experience.

 

[Lalrinzuala]

Nice build. So does this built leave a hole in your pocket. Or is it budget friendly.

 

[mpw]

sadik,

well made amp..

what is the current rating ?

regards

 

[sadik]

Looks very Nice Great job Hope it's sounds great . Have u checked it with any speakers...if so what's the model , please share your experience.

I have checked them on my friends DIY speakers. I have recorded the video of sound testing & uploaded on youtube.

As per my observation, the imaging, instrument separation, vocals, crystal clear highs.... everything was perfect. It did not create fatigue even after listening for hours. I think you can get some idea after checking the video.

Sadik

Nice build. So does this built leave a hole in your pocket. Or is it budget friendly.

When you are making a DIY, please remember you are trying to create a thing which is as per your taste or it is better than some of the Branded Products which may be 2 to 3 times costlier than the actual DIY built cost. So if I have spent 40-45K to create a Amp which can cost me above 1.5 lacs then i dont think the DIY cost had left a hole in my pocket. Plus in DIY you have an advantage to split the cost like the monthly installments.

Secondly I would have saved some good amount if i would have not worried about the aesthetics of the enclosure.

sadik,

well made amp..

what is the current rating ?

regards

Sir, I Didn't understand which current rating. Can you be more specific

 

[Lalrinzuala]

When you are making a DIY, please remember you are trying to create a thing which is as per your taste or it is better than some of the Branded Products which may be 2 to 3 times costlier than the actual DIY built cost. So if I have spent 40-45K to create a Amp which can cost me above 1.5 lacs then i dont think the DIY cost had left a hole in my pocket. Plus in DIY you have an advantage to split the cost like the monthly installments.

Secondly I would have saved some good amount if i would have not worried about the aesthetics of the enclosure.

If you have calculated the hours, your overall cost may increase a bit. But all the time and money will be even more worth it when you see and hear what you have made yourself. Great job

 

[raghupb]

Sir, I Didn't understand which current rating. Can you be more specific

I guess @mpw is asking about what is the peak current capacity per channel
Cheers,
Raghu

 

[liverpool_for_life]

What do you mean by the word neutral, I didn't understand that.

I meant transparent with respect to the input signal i.e. the amplifier doesn't color it.

 

[mpw]

Sir, I Didn't understand which current rating. Can you be more specific

sadik

peak current rating per channel as correctly put by FM RaghuPB

regards

 

[sadik]

sadik

peak current rating per channel as correctly put by FM RaghuPB

regards

Peak output current will be approx 150 Amp.

I meant transparent with respect to the input signal i.e. the amplifier doesn't color it.

I personally believe each and every topology of amplifier has its own sound signature. There are so many reputed brands out in market, every brand has its own sound signature, leave about brands even different models of same brand have different sound signature. So forget this belief that an amplifier dose not add color to sound. Even the TOP most Amplifier in the world will add its own signature (color) to the sound. In the end its your ears who will decide weather you like the sound or not, be it colored or neutral.

 

[rikhav]

Peak output current will be approx 150 Amp.

Even if In short bursts, that's massive

 

[sadik]

Even if In short bursts, that's massive

Agreed. Its PA amplifier Bro.

 

[raghupb]

Peak output current will be approx 150 Amp.

Whoa!!
The mighty JC1 had 135A peak current.
Sadik-bhai, your amp is a beast
Cheers,
Raghu

 

[rikhav]

Just for my knowledge can the audio boards be bridged internally to be a mono amp ?

@Aniket @sachu888

 

[liverpool_for_life]

So forget this belief that an amplifier dose not add color to sound.

If you say so. My question was fairly straightforward and I can't say that I understand the defensiveness in the response. Not every product can be for everyone and that's okay. Good luck!

 

[sadik]

If you say so. My question was fairly straightforward and I can't say that I understand the defensiveness in the response.

@liverpool_for_life Please don't take my comment in wrong way. If you feel i was rude then I am really Sorry.
But i am still Firm at my Point. Any amplifier in the world will color the sound up-to some extent.

Not every product can be for everyone and that's okay. Good luck!

Agreed, Hence the DIY way is followed. I cannot invest my fortune in the name of Brand Power just to get the sound right. I know the Basic Principles, I have skills and I know what I want hence I followed the DIY way.