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GB for Salas Folded Simplistic Phono PCB
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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
GB for Salas Folded Simplistic Phono PCB
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 for USA and Canada - 13.00 for Overseas shipping with Minikit and PS RAW Board. First class packaging available (some countries have tracking, most do not) starts at 24.00
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.

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 $64.00

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 (LOMC Only)

2SK170BL's - 31 usd
Q4-Q5 and Q6 are now going to be custom selected with different R11 (for Q5) and R8 (for Q4). These will help adjust the currents to any matched pair of 2SK170BL.
This is to make better use of existing stock of 2SK170BL without any performance hit. R11 and R8 resistors are now included with the 2SK170BL sets.

Click the image to open in full size.

PRP RIAA Resistor 8usd for 4 resistors, enough for stereo set of boards
PRP 9372 1/4W 25ppm .1% 47K -2 (R14)
PRP 9372 1/4W 25ppm .1%6.754k -2 (Replaced R5-R6)

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, 3892 views)
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Last edited by Tea-Bag; 9th May 2018 at 04:54 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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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
GB for Salas Folded Simplistic Phono PCB
I' m in for a board too.
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Old 1st September 2013, 09:55 AM   #4
shoom is offline shoom  Europe
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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

Regards
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Old 1st September 2013, 10:09 AM   #6
dimkasta is offline dimkasta  Greece
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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
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Old 1st September 2013, 10:13 AM   #7
merlin el mago is offline merlin el mago
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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
Bksabath is offline Bksabath  United Kingdom
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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
Rodeodave is online now Rodeodave  Austria
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GB for Salas Folded Simplistic Phono PCB
I want one board please
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Old 1st September 2013, 11:05 AM   #10
skouliki is offline skouliki  Greece
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Location: Athens
One board and minikit for me also.Thanks Salas and Tea-bag
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