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Old 1st September 2013, 01:16 AM   #1
Tea-Bag is offline Tea-Bag  United States
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Join Date: Feb 2006
Location: Kennebunk
Blog Entries: 10
Default GB for Salas Folded Simplistic Phono PCB

I am proud to offer the Salas Folded Simplistic Phono Preamp PCB.

Click the image to open in full size.

In Salas words :

"It uses a folded cascode input stage, passive RIAA filter, common source second stage, a source follower buffer with constant current bias. No form of feedback between stages is employed.
It can be made for different voltage gain. Input load is switchable. Suitable for LMC-MC-HMC-MM. (see build guide)
There is an official double layer PCB available for it that carries two channels and two MOSFET
shunt regulators.
It comes in one piece and it is pre-grooved to be breakable into separate channels."

The PCB is available for $52USD (~39 Euro).
The shipping costs is 8.00 USD (~6 Euro).
Accepting USD PayPal only.

This project took significant development costs and a long time cycle. It will probably be a limited edition for one or two runs depending on demand. Good components and nice boxes for it will be money well spent judging from my prototype's sonic results.

Click the image to open in full size.

Minikits will be made available as well and will contain limited parts - resistors and transistors for the Shunt supply portion and the RIAA caps VISHAY MKP 1837.

Please subscribe to this thread as well as check out the sign up spread sheet for "Salas Board" in my signature.

The GB will close on TO BE DETERMINED as of 12/23/13
Payment is via invoice only. Please send me a private message with PayPal email and I will forward you an invoice based on spreadsheet's data.

Here is the minikit details.
It is designed to allow for a bulk packaging of parts to get transistors and resistors for the power supply, and some small parts for the phono section.

Price is $56.00

3MM /Green/Red LED 20ma D1-4 10/20
BC560C Fairchild High HFE (600 typical) Q3y 6
2SK117GR Q2,Q3,Q5 10
BC550C Fairchild HIGH HFE (600 typical) Q4x 6

Vishay CFP 15R 100PPM metal film 2-3W R1x 2
VISHAY - MRS25 Series .6W 6.2K 50ppm R3x (high IDSS) 2
MRS-25 9.1k R3x 2
MRS25 120R R2x,R4x 4
MRS25 33.2R R6x 2
MRS25 27.4R R6x (high IDSS) 2
Welwyn MFR4 1R2 1% 50ppm
R5x 2
Vishay CFP 1.2K 100ppm 2W R13 2
Bourns 3296Y 1K VR1 2
Bourns 3296Y 2K VR2 2

IRF9610PBF Q1x 2
IRF9530PBF Q6x 2
4 position SPST 2
KEMET 0.1uf 100v 5% C3x 2
Vishay MKP-1837 .047 1% C1 2
Vishay MKP-1837 .015 1% C2 2
Wima 150pf 2.5%, plus 100pf sytrene cap C2Y2+2 (to trim to liking)

2SK369BL matched pair - $10.00usd
2SK369BL matched quads - 25.00usd

2SK170BL's Q4 (8.2-8.5ma),Q5 (7.5-8.1ma),Q6 (8.6ma or higher ma idss) triple pairs - 28usd

PRP RIAA Resistor's 8usd for 4 resistors, enough for stereo set of boards
PRP 9372 1/4W 25ppm .1% 47K -2
PRP 9372 1/4W 25ppm .1%6.754k -2

Here is the new RAW PSU that people have requested. Use this before the Folded Boards Shunt Supply as described in Folded Guide.
These are 15.00 each.

Click the image to open in full size.

Click the image to open in full size.
Attached Files
File Type: pdf Folded_Simplistic_PCB_Guide.pdf (722.8 KB, 3331 views)
Salas Boards GB 2017#1 ON ORDER | GB 2017 #2 Click Here to Sign Up! | Hot-Rod DCB1 boards and kits In Stock, PM | M2C Boards On ORDER

Last edited by Tea-Bag; 3rd January 2017 at 11:16 PM. Reason: added minikit
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Old 1st September 2013, 03:26 AM   #2
1MOR is offline 1MOR  United States
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Join Date: Jul 2008
I am in for one board and one Minikit.
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Old 1st September 2013, 09:25 AM   #3
vgeorge is offline vgeorge  Greece
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Join Date: Mar 2004
Location: poros island
I' m in for a board too.
"Without deviations from the norm, progress is not possible" - Frank Zappa
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Old 1st September 2013, 09:55 AM   #4
shoom is offline shoom  Europe
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Join Date: Jul 2010
Location: Worcestershire
one board and one minikit for me please
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Old 1st September 2013, 10:07 AM   #5
VT67 is offline VT67  Belgium
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Join Date: Jun 2004
Location: Belgium
Add myself to the list for a PCB and a Minikit

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Old 1st September 2013, 10:09 AM   #6
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Join Date: May 2010
Location: Athens
I m in for two boards and minikits. thanks a lot for doing this guys
Second harmonic and wine for everyone...
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Old 1st September 2013, 10:13 AM   #7
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Join Date: Sep 2009
Location: Catalonia - Europe
Add myself for one board & one minikit

Last edited by merlin el mago; 1st September 2013 at 10:15 AM.
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Old 1st September 2013, 10:15 AM   #8
Join Date: Dec 2007
BY time Salas get boards done !!!

I am in of course 2 boards 2 minikits prety please.
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Old 1st September 2013, 10:16 AM   #9
hates ground loops
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Join Date: Dec 2004
Location: in the alps
Blog Entries: 1
I want one board please
Gravity - Making the G since 13.7 billion B.C.
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Old 1st September 2013, 11:05 AM   #10
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Join Date: Aug 2010
Location: Athens
One board and minikit for me also.Thanks Salas and Tea-bag
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