Pass B1

[Tanoj]

Hi Sachin and OM Mishra ji

i am trying to power the MC phonostage with the same power supply of Nelson pass b1

since i have removed the ldr board now, can i use the same output to power the phonostage , it shows 5-0-15 , so i believe i can use 0-15 and can also increase the voltage upto 18 v if requred ?

the mid and the HF are fine, however the LF is less , so i removed the ldr board, however still not much difference, you think my source the problem ? any other change need to be done to Nelson pass ?

does anyone felt this problem with the LF ? , cos when i connect the same source and use my integrated amp LF is great.

Thanks

Tanoj

 

[sachu888]

Hi Sachin and OM Mishra ji

i am trying to power the MC phonostage with the same power supply of Nelson pass b1

since i have removed the ldr board now, can i use the same output to power the phonostage , it shows 5-0-15 , so i believe i can use 0-15 and can also increase the voltage upto 18 v if requred ?

the mid and the HF are fine, however the LF is less , so i removed the ldr board, however still not much difference, you think my source the problem ? any other change need to be done to Nelson pass ?

does anyone felt this problem with the LF ? , cos when i connect the same source and use my integrated amp LF is great.

Thanks

Tanoj

HTMCPS works on dual voltage.You can take output from -15-0 +15 from Power supply board.+/-18 would be maximum for most of the opamps.I would suggest you to keep +/-12 or +/-15 for OPA2134.
There is no LF loss in B1.I think the problem with source and Power amp.B1 doesn't add anything you get what you feed.Its just a buffered volume control.You are getting more LF connecting your integrated amp directly to source.It is boosting LF at the cost of other details.

Regards,
Sachin

 

[Santy]

I fired her up yesterday. There is no sound coming may be because the rotary switch is not working. I broke it open with excessive pressure while fixing the knob. I did manage to put it back together, (there were springs and ball bearings:indifferent14 but may be it is not proper. Or may be there is some other problem with B1. Both 15v and 20v supplies are fine though. I didnt get 3mm Blue LEDs so I am unsure if switching is a problem. I will have to check by by passing the source selector today to know if rotary switch is not making contacts.

 

[omishra]

I fired her up yesterday. There is no sound coming may be because the rotary switch is not working. I broke it open with excessive pressure while fixing the knob. I did manage to put it back together, (there were springs and ball bearings:indifferent14 but may be it is not proper. Or may be there is some other problem with B1. Both 15v and 20v supplies are fine though. I didnt get 3mm Blue LEDs so I am unsure if switching is a problem. I will have to check by by passing the source selector today to know if rotary switch is not making contacts.

If you bypass source selector then there are 2-1 selector (toggle switch) on B1 board also. You need to put proper jumper for whatever input you are using.

Please refer this post for details. There are pics.

 

[sachu888]

A pic would help.

Regards,
Sachin

 

[Santy]

Instead of bypassing source selector completely, I just shorted the input and output contacts on switch with a wire and it worked. I will have to replace the switch later.

Though she started to sing but surprisingly the volume pot behaved like a balance pot.:sad: When I pump up the volume to full, only right speaker works and when I bring it down to zero, the left speaker works. When I keep it in the middle both works but the sound is a lot subdued. Just now I realized that CW and CCW are interchanged in one channel. hyeah: Today I will set it right and check again.

 

[omishra]

Instead of bypassing source selector completely, I just shorted the input and output contacts on switch with a wire and it worked. I will have to replace the switch later.

Though she started to sing but surprisingly the volume pot behaved like a balance pot.:sad: When I pump up the volume to full, only right speaker works and when I bring it down to zero, the left speaker works. When I keep it in the middle both works but the sound is a lot subdued. Just now I realized that CW and CCW are interchanged in one channel. hyeah: Today I will set it right and check again.

Yes that blue wires of CCW and CW to be exchanged.

 

[Santy]

B1, PS, SS kits : Rs. 3000
2 metal knobs : Rs. 850
Transformer: Rs. 700
Cabinet, Accessories & Tools: Rs. 4500
Satisfaction of DIY: Priceless

Thanks to the DIY gurus, Sachin, Omishra and Bibin.

 

[sachu888]

Looks very nice build :thumbsup:

Regards,
Sachin

 

[santnai]

Nice build !!!!

Regards,

Santosh

 

[sann]

Nice clean build, doesnt look like you are a first time DIY'er Santy.
Would be interesting to read your review of B1. Congrats, sann

 

[omishra]

B1, PS, SS kits : Rs. 3000
2 metal knobs : Rs. 850
Transformer: Rs. 700
Cabinet, Accessories & Tools: Rs. 4500
Satisfaction of DIY: Priceless

....

Thanks to the DIY gurus, Sachin, Omishra and Bibin.

Thanks bro, +1 quad (Prasad)
Don't forget quad. He contributed that source selector design immediately.

Also what are impressions, I know it sounds heavenly as your build is up to mark, very nice. :clapping:

 

[Santy]

Looks very nice build :thumbsup:

Nice build !!!!

Thanks guys.

Nice clean build, doesnt look like you are a first time DIY'er Santy.
Would be interesting to read your review of B1. Congrats, sann

Thanks Sann. Yet to listen critically. My impressions may not be very appropriate since I do not have power amp. I will just have to try it with integrated. Not sure if there will be any improvement. While I revert on it, what is your opinion? Will it help improve SQ if it is connected to Integrated or Active speakers (which also has preamp in it)?

Don't forget quad. He contributed that source selector design immediately.
Also what are impressions, I know it sounds heavenly as your build is up to mark, very nice. :clapping:

Thanks Om. Certainly. Just that I was not active in this thread when it was in evolving phase with quad around... Thanks Prasad for helping us out.

 

[sann]

Will it help improve SQ if it is connected to Integrated or Active speakers (which also has preamp in it)?

In that case it would just work as a impedance matching device and resolve any impedance mismatch if exists between different sources and your integrated. With the pre amp section in your integrated still coloring(?) the sound the difference which B1 brings may not a as perceptible as it would if connected directly to a 'power amp' (will that also be a DIY? )

 

[Santy]

While waiting for the rotary switch to arrive, got into a creative mood and spent some time on this!

These are 5 mm LEDs

Wondering where I got the green cap? hyeah:

Soldered

Rubber bush for attaching it

Glued to the rear of the pot

Powered up!

LED ring!

Paste a butter paper cut to size in front of LEDs to diffuse the light so that you dont see the bulb but only the glow (not done here yet)

Is it cool?:licklips:

 

[sachu888]

Very good creativity.I must try that.Your B1 will never suffer from cold

Regards,
Sachin

 

[bibin3210]

While waiting for the rotary switch to arrive, got into a creative mood and spent some time on this!

These are 5 mm LEDs

Wondering where I got the green cap? hyeah:

Soldered

Rubber bush for attaching it

Glued to the rear of the pot

Powered up!

LED ring!

Paste a butter paper cut to size in front of LEDs to diffuse the light so that you dont see the bulb but only the glow (not done here yet)

Is it cool?:licklips:

Great Job Santy.....Use sandpaper and rub the back side of acrylic to diffuse the light. You can do the same thing around the power switch, and source selector. I had provided 2mm gap for the same purpose.

Few Suggestions,
1. Instead of the single core wire use shielded wire for signals.
2. Reduce the brightness of the LEDs

Thanks,
Bibin

 

[bibin3210]

Your B1 will never suffer from cold

Regards,
Sachin

:lol::lol::clapping:

 

[Santy]

Your B1 will never suffer from cold

You mean it can "breathe more air" into the speakers? hyeah:

You can do the same thing around the power switch, and source selector. I had provided 2mm gap for the same purpose.

Nah I wish to keep it simple Or it may look like a fancy stuff with lot of lights on it.

Few Suggestions,
1. Instead of the single core wire use shielded wire for signals.

You mean to say all signal wires between RCAs-Selector-B1.. I have to redo everything! CAT6 wire isn't good enough?

 

[bibin3210]

You mean to say all signal wires between RCAs-Selector-B1.. I have to redo everything! CAT6 wire isn't good enough?

Using shielded wire for signal is always recommended.