P-3A amp build

[Akaudiotech]

HI all, As a long time dream, I am trying to build a Rod Elliott`s P3A power amp with tone control and phono stage. Finally I bought the PCB form Elliott last august. But there was not enough time and money (for components and other parts) I postponed the project. Last month I restarted the project and ordered components, parts and accessories. The Initial PCB work is now complete and I would like to share you the progress of the amp. Comments and suggestions are welcome.

PCB
1. P-3A Rev A Power amplifier
2. P-05 Preamp power supply
3. P-06 Phono RIAA preamp
4. P-33 Speaker protection circuit
5. P-39 Soft start
6. P-97 Hi-fi preamp with tone control

 

[IndianEars]

Make sure you get transformers that meet specs of the design.

Transformers contribute HUGELY to the sound

 

[Akaudiotech]

Make sure you get transformers that meet specs of the design.

Transformers contribute HUGELY to the sound

Yes, you're right. I intend to use 25-0-25/500va toroidal for driver stage and 15-0-15 R-core for line level.

 

[keith_correa]

Also, overspec the heatsink.

 

[Akaudiotech]

Few updates.., Got enclosure, heatsink, TXR and partially assembled.

 

[Akaudiotech]

Ah.., Relay engaged successfully and quiescent current set to 18mv.

 

[drlowmu]

Yes, you're right. I intend to use 25-0-25/500va toroidal for driver stage and 15-0-15 R-core for line level.

What is the VA rating of the 15-0-15 R-Core? What is the largest possible VA rating R-Core that you can fit in or on the chassis?? Now is perhaps the good time to plan to oversize it to the maximum, as per Indian Ears' post. Shilchar, etc.

 

[Akaudiotech]

What is the VA rating of the 15-0-15 R-Core? What is the largest possible VA rating R-Core that you can fit in or on the chassis?? Now is perhaps the good time to plan to oversize it to the maximum, as per Indian Ears' post. Shilchar, etc.

Hi, the VA rating that I've choose 39VA from A.M. Technologies. BTW, thank you for your point out.

 

[Subbu68]

Looking forward to seeing it complete.

 

[sdk]

Please could you put up a parts list for the P3A board?

TIA

 

[Akaudiotech]

Looking forward to seeing it complete.

Definitely bro. It doesn't complete right now. Waiting for the arrival of some parts and panel, switches.

Please could you put up a parts list for the P3A board?
TIA

Sure. I'll post of the parts and accessories list once I finish. Thx

 

[Akaudiotech]

Hi all, Sorry for my late updates. Because some parts arrived (Ie vu meter and driver board) recently, and were delayed in customs. Almost assembled. It will be completed soon. VU meter from china and logarithmic driver board source from www.vumeter.eu from Lithuania.

 

[Akaudiotech]

Input selector board and Alps VC from the audio crafts (Aminder). Thanks to him.

 

[Akaudiotech]

Acrylic panel, Actually this`s my third panel of this project. Partially fixed.

 

[Akaudiotech]

Just finish and testing purpose...

 

[VSTEREO]

Great build. Sounds superb!

 

[sdk]

Please could you put up a parts list for the P3A board?

TIA

Congratulations on great build. Please can you put up the BOM and links of where you sourced the parts

 

[Akaudiotech]

Congratulations on great build. Please can you put up the BOM and links of where you sourced the parts

BOM sent by PM. Regarding parts that I've sourced from..,
Metal film Resistors and Wima Caps from the audio crafts. Few resistors and Electrolytic, semi conductors from in.elemen14.com (please ensure that you have registered GST). Connectors and other parts from sharvielectronics, Bangalore. PCB directly from Elliot.

Thanks
Akat

 

[manir]

Super build..Sounds so sweet...
what is speaker setup...

 

[manir]

Bro, source of Cabs and panels?