Peeceebee V4H

[Beginner_N]

Finally, V4H chassis ready. Only face plate anodizing pending. I will start assembly soon.

 

[Sushant Sharma]

I hope you are satisfied with the design this time.

 

[Beginner_N]

I hope you are satisfied with the design this time.

It wasn't about design. It was more of manufacturing.

 

[amit_s]

Recieved my V4h kit, will be building it in in last week of December.

 

[Beginner_N]

Recieved my V4h kit, will be building it in in last week of December.

Enjoy the journey. And don't forget to read update on diyaudio.

 

[amit_s]

Enjoy the journey. And don't forget to read update on diyaudio.

For PSU are you going with the one by Shaan or some other?

 

[Beginner_N]

For PSU are you going with the one by Shaan or some other?

Shaan's PSU.

 

[amit_s]

What is the transformer rating you are using? I have planned for 600va 40-0-40 from torotrans.

 

[MaSh]

I have a Torotrans toroid which I had ordered for the Peeceebee amp. However, with that project shelved, the transformer is lying idle. Its quite a heavy transformer with a Lot of available connections. I got it for 4.5k. Please PM if anyone is interested to pick it up.

MaSh

 

[Beginner_N]

What is the transformer rating you are using? I have planned for 600va 40-0-40 from torotrans.

Yes, same.

 

[jls001]

Use 800VA for V4H.

 

[amit_s]

Use 800VA for V4H.

Why 800va ? It seems too much, how do we derive the required rating ?

 

[jls001]

600VA is sufficient but a higher VA will have lesser rail-sag under load so 800VA (400VA per channel for dual mono) was recommended by Shaan.

40V-0-40V transformer with ~56.5V after rectification/filtering.

 

[amit_s]

600VA is sufficient but a higher VA will have lesser rail-sag under load so 800VA (400VA per channel for dual mono) was recommended by Shaan.

40V-0-40V transformer with ~56.5V after rectification/filtering.

Would there be substantial sonic benefit?
I have read that big toroidal transformer is susceptible to hum and buzzing noise if some dc component is there in the mains. Also, there will be increase in approx 1 kg weight.

 

[spirovious]

Would there be substantial sonic benefit?
I have read that big toroidal transformer is susceptible to hum and buzzing noise if some dc component is there in the mains. Also, there will be increase in approx 1 kg weight.

May transformer not struggling with serious load.May be less heat.May be better dark background in sound.When using dcb1 or B1 ,which need very less current(10mA?),we use 1 amp transformer.

 

[jls001]

Would there be substantial sonic benefit?
I have read that big toroidal transformer is susceptible to hum and buzzing noise if some dc component is there in the mains. Also, there will be increase in approx 1 kg weight.

If pushing the amp to high loads the bigger transformer will help with the extra headroom. There shouldn't be sonic benefits in regular usage.

 

[surfatwork]

A larger transformer will also run cooler because of the extra headroom. Issues of transformer hum can be resolved by shielding, or repositioning/rotating the transformer. The most common cause of hum (ground loops) has nothing to do with transformer size.

 

[amit_s]

Finally, got my first diy project Peeceebee v4h done. Amp is singing with no noise or hiss at all even if I bring my ear close to test speaker. I was sceptical about noise because I have used a big 800va toroid and also being my first diy I wasn't sure about organising wiring and placement of components. Thanks to @shaan and @Beginner_N for prompt and valuable support. I added a pic of internals any suggestion for improvement.

Using 4ohm sony coaxial car speakers for testing, will buy floorstanders .

 

[sarathssca]

Are we using lateral MOSFETS 2SK1058 and 2SJ162 or any other alternatives? Where r we sourcing these ?

 

[amit_s]

Any suggestions for best match of speakers with v4h, budget upto 1 lakh?