Pass B1

[Audiodoc]

Ok, then probably FM anilva will help me in this regard. I would have sourced from spencer too but it takes a lot of time.

 

[anilva]

Ok, then probably FM anilva will help me in this regard. I would have sourced from spencer too but it takes a lot of time.

Audiodoc, I have been pretty busy lately. I need to measure the idss for a match and then send you.

Cheer.

 

[Audiodoc]

Thanks anilva. Take your time. Have ordered a pair of irf 610 from element 14 will again check the regulated dc voltages after replacement.

 

[sachu888]

I have got few requests for Pass B1 kit, FMs interested so far

1.TheCoolestOne
2.Sann
3.Svaze
4.ruenigma
5.denom
6.Murli N.
7.Santy

Kindly express your interest here if anyone wants to participate.Cost for one B1 and one Power Supply kit would be Rs 4000 including shipping with DTDC.There will be no LDR this time.I will provide good quality 25k Mono Volume pots.

Regards,
Sachin

 

[Kittu]

@Sachu888,

Does the kit include cabinet/Housing?

 

[sachu888]

@Sachu888,

Does the kit include cabinet/Housing?

No only parts and PCbs.You will need to buy all hardware,transformer and a case.

Regards,
Sachin

 

[darshanjoshi]

I have got few requests for Pass B1 kit, FMs interested so far

1.TheCoolestOne
2.Sann
3.Svaze
4.ruenigma
5.denom
6.Murli N.

Kindly express your interest here if anyone wants to participate.Cost for one B1 and one Power Supply kit would be Rs 4000 including shipping with DTDC.There will be no LDR this time.I will provide good quality 25k Mono Volume pots.

Regards,
Sachin

W/O LDR, will it sound at its best?

 

[sachu888]

W/O LDR, will it sound at its best?

Original B1(Commercial version) uses two mono 25k PEC pots The First Watt B1 Buffer Preamp Article Written By Nelson Pass Of First Watt DIY Audio Kits Reviews
LDR is a passive volume control and sometime having impedance matching issues.I am using B1 as pure buffer (without volume control)and it sounds better than B1 with LDR.FM Kroyin is using two mono pots,he prefers it over LDR.

Regards,
Sachin

 

[ruenigma]

No only parts and PCbs.You will need to buy all hardware,transformer and a case.

Regards,
Sachin

Can you help us source those? I mean pointing to appropriate sources.

 

[Santy]

sachin.. I am also interested. Please count me in.

 

[sachu888]

Can you help us source those? I mean pointing to appropriate sources.

Cab's are available at Pune.Omishra has built one.We bought R-core Transformers from EMD Hydrabad.They are cheap Rs 450(approx+shipping)and very good quality.

Regards,
Sachin

 

[sachu888]

sachin.. I am also interested. Please count me in.

Added to list.

Regards,
Sachin

 

[svaze]

Sachin, how about having a dual stereo pot instead of mono?

 

[sachu888]

Sachin, how about having a dual stereo pot instead of mono?

47k/50k Dual can be used IMO.

Regards,
Sachin

 

[sann]

I am using B1 as pure buffer (without volume control)

Sachin, could you please explain this configuration? and the position of the vol control in your chain?
Regards,
sann

 

[apk]

Hi Sachin,

Great to see so much interest in the pass B1. Seems like the Pune HFV meet has generated a lot of interest in the pass B1 due to Om's DIY efforts.

Can you tell us which is the best B1 configuration that provides the highest sonic value? Om has done a lot of tweaking to get the final sound, right?

Also, from what I know, the pass B1 does not add any gain. Is there any design that can be added/modified to the B1 which will give it a small amount of gain - say 6db. My power amp has a reasonably high input sensitivity - 2.8V, so with a line source of 2V, I think I will need a little bit of gain. Not sure if the B1 in stock form would work well.

Thanks,
APK

 

[keith_correa]

So we have:
B1 as a pure Buffer
B1 with LDR
B1 with 2 mono pots
B1 with a stereo pot

Sonically, which in FM opinions is better?

 

[sachu888]

Hi Sachin,

Great to see so much interest in the pass B1. Seems like the Pune HFV meet has generated a lot of interest in the pass B1 due to Om's DIY efforts.

Can you tell us which is the best B1 configuration that provides the highest sonic value? Om has done a lot of tweaking to get the final sound, right?

Also, from what I know, the pass B1 does not add any gain. Is there any design that can be added/modified to the B1 which will give it a small amount of gain - say 6db. My power amp has a reasonably high input sensitivity - 2.8V, so with a line source of 2V, I think I will need a little bit of gain. Not sure if the B1 in stock form would work well.

Thanks,
APK

B1 with 2x 25k pots sounds best.FM Kroyin has compared all the combinations
B1 with LDR
SSp+B1 with LDR
2 B1 with LDR
and B1 with 2x 25k mono pots
The last combination sounds best to his ears.
B1 in stock form should provide you enough gain to drive your amp.You can also add SSP in front of B1 if you feel low gain.It will not degrade the sound.

Regards,
Sachin

 

[denom]

Cab's are available at Pune.Omishra has built one.We bought R-core Transformers from EMD Hydrabad.They are cheap Rs 450(approx+shipping)and very good quality.

Regards,
Sachin

Sachu,

Kindly advise exact cost to transfer to your a/c by PM/mail. My mail id
pusayoba at g mail dot com

Also advise the best iteration of the B1 pre, will go by your judgement on this & am sure the others will too. Am sure we all will require vol pot. Thanks.

Also request you to courier my kit to ruenigma, as he will take care of getting it built on my behalf

Santy, are you building yours or will you also want to get it readied by our home cooking expert

 

[sachu888]

Sachin, could you please explain this configuration? and the position of the vol control in your chain?
Regards,
sann

I have removed LDR from B1 and put jumpers on B1 PCB.I am now controlling volume with my Tube amp.

Regards,
Sachin