B1 Passive Preamp

ed · Post by ed » Sun Nov 02, 2008 4:38 pm

heres the link to the B1 that I alluded to in another thread

http://www.passdiy.com/pdf/B1%20Buffer%20Preamp.pdf

I've found it very neutral, although the only way I can judge it is with a ropey old CD player as all my sources have digital attenuation.....

perhaps it'll get a shake down the next time Steve has a small do??

Ed

ed · Post by ed » Sun Nov 02, 2008 4:43 pm

its truly simple to build.... here is the top of the board:

ed · Post by ed » Sun Nov 02, 2008 4:44 pm

and the rude bit....here is the bottom of the board:

iansr · Post by **iansr** » Sun Nov 02, 2008 10:20 pm

Hi Ed
I've been waiting for Pass to make the PCBs available for the B1 (I don't have the knowledge to build it from scratch) and when they did become available they got snapped up immediately. Have to wait for the next batch.

Good news that you are impressed with it. I plan on hooking mine up to my TVC rather than using an Alps pot as Pass did.

Ian

suds · Post by **suds** » Fri Jan 15, 2010 8:39 am

I have some B1 Clone PCB left ..
Modification : modified to include Power Supply, Rectifier Diodes, Aleph Pot, multi size capacitors. (see image), delay circuit, selector relay. LED.

Attached is top side of PCB.. as I cannot attach big file, will attach full PCB details(layout details, BOM) to reply mails. Costing at PCB is $7 USD each plus shipping. I accept paypal.

Thanks
suds

Mike H · Post by **Mike H** » Fri Jan 15, 2010 12:33 pm

Mmm, interesting.

.

floppybootstomp · Post by **floppybootstomp** » Fri Jan 15, 2010 8:14 pm

Good link Ed, I've printed that one out for keeps, may very well put that together in the future, I can feel a rummage through me bits coming on.

Greg · Post by **Greg** » Fri Jan 15, 2010 8:29 pm

floppybootstomp wrote: I can feel a rummage through me bits coming on.

Take a cold shower. That'll sort it out

Dave the bass · Post by **Dave the bass** » Fri Jan 15, 2010 8:30 pm

Greg wrote:
floppybootstomp wrote: I can feel a rummage through me bits coming on.
Take a cold shower. That'll sort it out

Ha! ISWYDT

DTB

Mike H · Post by **Mike H** » Fri Jan 15, 2010 10:07 pm

Nothing like a good ol' rummage through yer bits.

.

suds · Post by **suds** » Sat Jan 16, 2010 5:44 am

Shipped in two working days..
Payment Paypal
Shipping EMS + paypal charges = 28 (for upto 3 Boards)

Please Note : These are surplus boards, i.e the finishing (solder mask colour, and silk screen) of Board is not so good, as you can see in photo. The issue is with only colour of board, and silk screen
Board Spec: FR4, 35micron copper, with solder mask,a and silk screen.

Will provide you schematic and BOM (Bill of materials) for the boards.

Attached Solder Side image of PCB

Thanks
~suds~

suds · Post by **suds** » Sat Jan 30, 2010 8:46 am

Hi,

I will be making B1 (unmodified, original from gerber) for me and my friends.. will make extra PCB's

Each PCB will cost $10 plus shipping $18 (registered International)
or $28 (EMS).
Please mail me to confirm the PCB's

Thanks
suds

andrew Ivimey · Post by **andrew Ivimey** » Wed Feb 03, 2010 7:27 pm

My B1 is very happily playing. I agonised about building it for weeks.
I won't bore you with the details but I crammed it into a spare WADpre2 and .... yeah, nice, very nice indeed!

Nelson Pass; good man!

Ali Tait · Post by **Ali Tait** » Wed Feb 03, 2010 8:10 pm

How does it compare to your pre2?

andrew Ivimey · Post by **andrew Ivimey** » Thu Feb 04, 2010 8:36 am

not saying!

Only two LPs into listening so far. Let's say, for now that I am 'enthusiastic' about B1 and want to marry Mr Pass' daughter - something like that.

audio-talk

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