I am going to start point-to-pointing the Pass Labs B1 Buffer Preamp in a week or two when I get some time. I have attached the schematics with transposed part specs for anyone else who wants the information.
Did you give up on waiting on the PCB? I've been checking the site every once in a while and haven't seen them become available again.
I'll look forward to your updates.
I did get tired of waiting for the board... And since it has so few parts anyway, I'll just get a breadboard and do it myself.
I ended up buying one from Tim Rawson instead of trying to build one without the board. Even though there's a low parts count and it seemed pretty straight forward, I got intimidated/confused reading the threads on diyaudio.com.
Ya, those threads were a little intimidating, but I figure that's the best way to learn. :D
I posted the B1 schem awhile back.http://www.polkaudio.com/forums/show...S+PREAMP.Looks like a great little pre,if I didn't already have a Pass Jfet clone then I would probably build one of these or the B3.If I where to build it I think I would use the bipolar 9 volt power supply so as to eliminate the need for costly output caps.
Btw, I would avoid using Jantzens that are in the picture above.
What was wrong with the Jantzen caps? I used them in my Monitor 5Jrs with good success.
Where did you get the chassis Face? Your completed product looks fantastic!
They come in several sizes and with either plastic or metal fronts. I have used them for several projects.I used a small one for this passive pre.
I bought mine used and I believe the case is unavailable.
Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
I'm kind of surprised that I liked them then in my 5Jrs, because I really like the Sonicaps in my 4.1TLs. Or maybe they just work well with those speakers. I will be building this with Daytons however since I have had good results with them in electronics before.
Are the Jfet's hard to source for this thing, or am I remembering incorrectly?
2SK370 Transistor 4x
15000 uF 2x
10 uF 2x
1 uF 3x
1k ohm 4x
10k ohm 2x
25k ohm 2x
221k ohm 2x
1M ohm 6x
2 way switch
RCA jack 6x
Last edited by zingo; 01-25-2009 at 11:26 PM.
I remember reading that if you contact Pass Labs, they may be able to sell you a board. They're leaving the "out of stock" message up on their page due to them not being able to meet demand.
I may actually grab a second one.
Updated Parts List:
2SK370 N channel JFET Transistor 4x (GR or BL grades)
15000 uF 2x Electrolytic 25v
10 uF 2x Film
1 uF 3x Film
1 ohm 3w
1k ohm 4x .25w
10k ohm 2x .25w
15k ohm .25w
25k ohm 2x .25w
221k ohm 2x .25w
1M ohm 6x .25w
2 way switch
RCA jack 6x
Linear Taper Pots 25k 2x
New wiring, Mike?
Daytons in mine. Finally checked tonight.
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