Pass Pearl PCBs and related parts

[luvdunhill]

This will close on Friday and funds will be due as soon as you can on the weekend, with the goal of paying for the boards before Monday.

I think we're at 6 sets, assuming Thrice wants 2 boards, not 2 pairs.

[grawk]

I'll take a set.

[DigiPete]

I'll take two boards, how much are they?

[luvdunhill]

Originally Posted by luvdunhill

Price will be $40 per stereo set, with a few dollars for shipping from Germany to me (depends on the number of people interested, probably around $4) and then a few dollars shipping from me to you.

.

[luvdunhill]

I sent a PM to the interested parties with cost information and some part recommendations. If anyone else is interested, please let me know as soon as possible!

[DigiPete]

Originally Posted by luvdunhill

yes, that's the plan.

I may be doing a group buy for the Linear Systems JFETs, assuming there is enough demand. These will work fine with these boards if you cannot come across the Toshiba parts.

Are those Jfets available yet? I'm in for a group buy.

[EdipisReks]

Originally Posted by Nenso

The only thing I can do is solder.

sounds about right.

[en480c4]

Originally Posted by EdipisReks

sounds about right.

Reks FTW!

[luvdunhill]

Originally Posted by DigiPete

Are those Jfets available yet? I'm in for a group buy.

yes, I'm heading up a group buy for the Linear parts.

Otherwise, you can get the Toshiba parts here for a good price:

2SK170; 2SK170BL Toshiba Low Noise JFET - Buy Online @ AmpsLab

You'll have to match 2 of them to make the dual 2sk389...

[luvdunhill]

Originally Posted by EdipisReks

sounds about right.

hey, don't be so mean.... he can type and hit the post button too.

[Pars]

Originally Posted by luvdunhill

yes, I'm heading up a group buy for the Linear parts.

Otherwise, you can get the Toshiba parts here for a good price:

2SK170; 2SK170BL Toshiba Low Noise JFET - Buy Online @ AmpsLab

You'll have to match 2 of them to make the dual 2sk389...

Matched Toshiba available here. This is jackinnj from DIY audio's store; I've ordered from him before and got what I was after, so should be good.

[luvdunhill]

Originally Posted by Pars

Matched Toshiba available here. This is jackinnj from DIY audio's store; I've ordered from him before and got what I was after, so should be good.

good catch. I should have recommended Jack as well. I need to make it rain where he lives,, as he said that's when he'll start matching the Fairchild devices he's selling for the F5. I'd like to stick them in my F4, as they're better than the IR devices IMHO. Any ideas? The Russian and Chinese can control the weather, so I should be able to...

[grawk]

/me fires up the satellite.

[luvdunhill]

For those that asked, each circuit board is 177 mm x 127 mm (6.97" x 5").

[EdipisReks]

Originally Posted by luvdunhill

he can type and hit the post button

heh

[909]

i've searched a bit, but can't find any specs on the pearl...

are gain, load impedance and capacitance adjustable and if not what's it set at?

[luvdunhill]

yes, input resistance and capacitance are user definable. The circuit uses split-RIAA. The second stage has 30dB gain. The first is 29dB minus the RIAA EQ... .. so around 60dB.

Here's an excerpt from the service manual:

"The phono stage was tested on two different systems with a Grado
Sonata (47 Kohms load), a Kiseki Lapus Lazuli (100 ohms load),
and a Sumiko Celebration (1000 ohms load) cartridges all of which
have outputs in the range of 400 to 500 microvolts.
The circuit was quiet and had sufficient gain. A subjective
consensus has it that the phono stage offered precise imaging and
spatial placement and good depth. Compared with the Xono, the
Pass Labs reference, it was slightly noisier, and had less gain.
From a sonic standpoint, it acquitted itself well in comparison,
lacking only slightly in dynamics."

[DigiPete]

So will this work properly with both MM and MC carts, or does the circuit need tweaking to adjust the gain for one or the other?

[luvdunhill]

Originally Posted by DigiPete

So will this work properly with both MM and MC carts, or does the circuit need tweaking to adjust the gain for one or the other?

it has fixed gain and will work with MC down to 0.4mV-0.5mV. With MM carts you'll have have that much more gain. No problem with that. The Grado Sonata mentioned is what, 4-5mV MI output? It's been a while since I owned one. I'm planning on using a 2.5-3mV high output MM cartridge.

[DigiPete]

I plan on getting an MC cartridge with 2.2mv output.

How do you adjust the input impeadance of the Pearl to match the cartridge being used? Or is there any need to?