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Old 5th December 2008, 01:56 AM   #981
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Since I was too late to buy the board (oops!) I decided to build it p2p.
Lesson learned - don't attempt p2p layout/soldering when dog tired - mistakes abound, and i have given up for tonite!

Byron
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Old 5th December 2008, 02:28 PM   #982
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Oops, I didn't match any of my LSK170's.

Will that be a problem?
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Old 5th December 2008, 02:54 PM   #983
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Hi,
the sk170s don't need to be matched in that they do not form a balanced LTP stage.
However, it seems that much of the reported excellent performance comes from operating the stages at the correct Id and this requires that the CCS allows the upper device to stay within it's optimum range.
Some minor tuning of the lower CCS resistor could bring the upper device back to it's sweet spot.

The easy way is to select sk170s that are close to each other to get what Pass is recommending.
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regards Andrew T.
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Old 5th December 2008, 03:01 PM   #984
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Ok, thanks.

I ordered my parts before a pcb board was available (and overpaid for my jfets - but i did get a few a free samples from linear).

I'll get it working before I decide to get some matched jfets from NP.
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Old 6th December 2008, 05:58 PM   #985
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I finally finished hooking up my B1 and everything seems to be working well.

Click the image to open in full size.

Pretty standard stuff. The extra switch in the back is for a home theater by-pass (yes, I know the switch is overkill, but it was sitting in my parts bin and made for clean wiring).
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Old 6th December 2008, 09:40 PM   #986
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Great to see you have completed yours. I am still half way done.
Anyway what are your initial impressions on how it performs?
What were you using beforoe the B1 and how does it compare?
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Old 7th December 2008, 05:04 AM   #987
Salas is online now Salas  Greece
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I know its for main system use, but because its easy and cheap to make, I report that it helps a lot in my PC too when I don't need it for other checks. Because its unity gain, I push the digital faders near max, hence not losing bits, and control nicely the active sub and sat PC speaker combo. Along with a listening position EQ with my calibrated mic and ARTA, it gives good quality for near field listening of all the stuff that can go on in a PC. I.e. Everything. Recommended use.
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Old 7th December 2008, 12:53 PM   #988
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Hi Nelson,
Is there any word on when the next batch of boards will be available?
thanks,
Byron
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Old 7th December 2008, 03:04 PM   #989
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Quote:
Originally posted by thanh1973
Great to see you have completed yours. I am still half way done.
Anyway what are your initial impressions on how it performs?
What were you using beforoe the B1 and how does it compare?

I'm not a good basis for comparison since it's really my first dedicated two channel pre-amp. At the moment, it's in front of a Trends TA-10.1 (the Trends has internal jumpers to by-pass the built-in pot).

It's sounding clear and detailed to me.
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Old 9th December 2008, 02:10 PM   #990
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I was at a couple of electronic surplus shops this past weekend looking for a couple of 18v dc walwarts, but came up empty handed.

They had plenty of 24v ones for about ~ $9. But I figured I should look further.

I'll check ebay for a pair...
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