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Old 23rd January 2013, 12:50 PM   #1
Aniket is offline Aniket  India
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Default Anybody know this Amp

Hi ,
This schematic along with PCB and construction guide was published in EFY magazine about 25 yrs ago (when I was born) . It was rated or advertised at 120W@4ohms .I was looking into my old stuff when i found the PCB and schematic. I made this amplifier about 8-9 yrs ago when I was in school and amazingly IT Worked for about an hour or so till the outputs and drivers burned out(i used 2n3773 and tip122 maybe). I remember it was my fault, as I used tiny heat sinks and didn't know how to set bias and other things. I abandoned this project and made a nice and working STK465 amp, using its power supply and transformer(30-0-30V,8A).
As i found the PCB and got some 2n3773's, ttc5200's, 2sc4793,sa1837, tip41,42c and bd139,40's I am looking forward to rebuild this amp.
Any advice and if anybody know this amp are welcome.

Regards,
Aniket
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Old 23rd January 2013, 02:26 PM   #2
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Hi Aniket
greetings if you are new to amps dont build this amp it brings back 25 years ago
memories going to delhi and buying the pcb from EFY office many better tested designs
are on the forum B500 APEX AUDIO is a good amp to diy
warm regards
andrew lebon
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Old 23rd January 2013, 04:57 PM   #3
Aniket is offline Aniket  India
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Hi Andrew,

Have you build this amp? How was your experience?
I was thinking to rebuild this amp with modern components as I have some to spare and I also have the PCB and it did worked when i first made it.
If you tell me something more about it then i would think again to rebuild this amp.

Regards,
Aniket
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Old 23rd January 2013, 06:56 PM   #4
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one option might be to convert it to a complementary amplifier since this one is a quasi ( all outputs NPN )

In case you decide to built it any way and either way quasi or not you need to find a way to attach TR 7 to the main heatsink so it is possible to sense temperature and adjust bias accordingly ( very critical for thermal stability) TR7 can also be replaced with a BD 135-139 for easy mounting .
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Old 23rd January 2013, 10:16 PM   #5
routhun is offline routhun  United States
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Hi Aniket,

You have most important part of the DIY amplifier, PCB is there and its partially populated. I would suggest you go ahead and replace the bad components with proper heat sinks and power it up with standard DIY amp procedure. Once it works as expected, if you want to improvise the sound you can replace some of the transistors with advanced ones. But for now complete as it is, I guess this should be a good amplifier.

Thanks,
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Old 24th January 2013, 12:51 AM   #6
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I propose you keep this design too, but replace with newer parts. If you want to try something little different, try amp from this thread Brother of Quasi ,your PCB's will fit with minor changes.
Best regards
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Old 24th January 2013, 03:58 AM   #7
Aniket is offline Aniket  India
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Thanks all,
Any advice for substitutes, as none of the transistors are available except bd139,140.
As i figured out for bc147-bc547c, cil603,612-bc546b, 2n6254-2n3773 and 2n6261-tip41c should do.
For complementary design i need to cut the traces on the PCB and i might use 2 pairs of output devices, and i have some ttc5200 and tta1943 for complementary pair.

Regards,
Aniket
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Old 24th January 2013, 04:06 AM   #8
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Hi Aniket
greetings many better designs are on this forum with easy to get parts
more power and better sonics just finishing a amp for my friends we have a small band
this amp sound quality and power output is better than all indian amps and most chinese amps so go through the forums and decide which amp fits your bill money wiseand availabilty of components
warm regards
andrew lebon
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Old 24th January 2013, 06:31 AM   #9
Aniket is offline Aniket  India
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Hi Andrew,

I am rebuilding this amp only for learning purpose. As i have the PCB i would just mount the components and suitable transistors, if it works then great, if it doesn't no matter, would just give it a try and which amp you are referring/making?
Of course there are great designs in the forum, Apex B500, AX14/20, SR100/200 and DX's Blame ST and MKIII and DIY AB amp(the Honey Badger) and I follow these threads, for sure I would build one of these amps later for my home system.
Currently i am using the amp(schematic attached), i made myself and i m very happy with its performance and sound quality, with the speakers i use(image attached), it shakes my apartment and has earthquake like bass.

Regards,
Aniket
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Old 24th January 2013, 06:19 PM   #10
Aniket is offline Aniket  India
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Default Success!!

The amp worked fantastic. Using ordinary components and minor changes in the bias circuit it sounded quite nice.
I used BC547,BC546 for the input stage and BD139,140 for VAS and pre driver and TIP41C as driver and a quasi output stage with 2N3773. Set the bias at 75mA. The amp was so stable and quite and the heat sink was just warm after 2 hrs. continuous playing loud. I used an 8" 60W 4ohm woofer for testing and a basic +/-16 V supply for testing. I was wondering how it played so loud and clear with only 16 volts, amazed. Have a look at the video.https://www.youtube.com/watch?v=-zv_k7KH1eM
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