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Pass B1

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  #1  
Old 28th September 2011, 06:26 PM
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Pass B1


Hi all,
After completion my first successful DIY phono, have decided to build this preamp by Nelson Pass.I can get the PCBs done locally and find out the source of matched JFETs.All other components are available with Digikey/Mouser.If anyone interested please let me know so we can save some shipping cost.
Some links:
Andy_H's Pass B1 Build - AudioKarma.org Home Audio Stereo Discussion Forums
Nelson Pass B-1 preamp kit
B1 Buffer Preamp - diyAudio
DIY Order Form



regards,
Sachin
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  #2  
Old 28th September 2011, 06:57 PM
 
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Re: Pass B1

This, I believe is a passive pre-amp. Looks like a great kit. DIYA is head over heels about this. Now, I would like to know if it would suit a UCD180ST based amp? If so, I am very interested.

Jetlag
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  #3  
Old 28th September 2011, 07:02 PM
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Re: Pass B1

Quote:
Originally Posted by jetlag View Post
This, I believe is a passive pre-amp. Looks like a great kit. DIYA is head over heels about this. Now, I would like to know if it would suit a UCD180ST based amp? If so, I am very interested.

Jetlag
Hi,
I think this is D class amp.IMO B1 should work with this.

Regards,
Sachin
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  #4  
Old 28th September 2011, 07:22 PM
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Re: Pass B1

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Originally Posted by jetlag View Post
This, I believe is a passive pre-amp.

Jetlag
it is not passive , but a buffer with no gain, so good match with power amps with plenty gain imho
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Old 28th September 2011, 07:26 PM
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Re: Pass B1

So its not a great match to the MyRef Gainclone with 35W per channel?

I'll take one kit anyways

--G0bble
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Old 28th September 2011, 07:32 PM
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Re: Pass B1

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Originally Posted by borg View Post
it is not passive , but a buffer with no gain, so good match with power amps with plenty gain imho
Hi Borg,

I think B1 is a passive buffer preamp.

Regards,
Sachin
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Old 28th September 2011, 07:38 PM
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Re: Pass B1

i meant something like pass f4 which dont have any gain ,even f5 which also not high gain iirc
myref i am running straight off a dac without any pre. so should be ok
a buffer has high input impedance so it doesnot load the source and also can drive difficult load,
check with siva how much it helps
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Old 28th September 2011, 07:43 PM
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Re: Pass B1

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Originally Posted by sachu888 View Post
Hi Borg,

I think B1 is a passive buffer preamp.

Regards,
Sachin
It need power isnt it?, so active enough for me. Atleast that is what we were taught,it is been more than a decade so i am a bit rusty
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  #9  
Old 28th September 2011, 07:50 PM
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Re: Pass B1

Hi all,
I have 3 confirmed members for B1.The main hurdle was to get matched JFETs which have been sorted out, remaining parts can be ordered from Digikey.I am going to put order for 10 pairs of matched JFETs tomorrow,kindly confirm your participation for the kit.
PS: I don't know the final cost but it should be within RS 3000/-

Regards,
Sachin
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Old 28th September 2011, 09:09 PM
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Re: Pass B1

Quote:
Originally Posted by sachu888 View Post
Hi all,
I have 3 confirmed members for B1.The main hurdle was to get matched JFETs which have been sorted out, remaining parts can be ordered from Digikey.I am going to put order for 10 pairs of matched JFETs tomorrow,kindly confirm your participation for the kit.
PS: I don't know the final cost but it should be within RS 3000/-

Regards,
Sachin
Yes I am in for it. What about getting a bundle of source selectors like: Stereo selector switch and a bundle of 50 or 100K volume pots like ALPS Blue RK50: ALPS - Products Line. The 50K appears to be a quad unit though.

Edit: These may also suit: 12mm Size Insulated Shaft Snap-in Type RK12L Series

-G0bble


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