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AKSA's Lender Preamp with 40Vpp Output
AKSA's Lender Preamp with 40Vpp Output
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Old 15th December 2017, 02:58 PM   #371
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Thanks for pointing that out jwjarch.
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Old 15th December 2017, 03:09 PM   #372
pcgab is offline pcgab  United States
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AKSA's Lender Preamp with 40Vpp Output
Quote:
Originally Posted by jwjarch View Post
Thanks JSP. Scored some CK1051's on eBay. I think there are a few left if anyone is interested.

3x4 rotary switch 3-pole 4-position PCB mount (DS3PC, CK-1051) 30 150 mA, 250V | eBay
Thank you for the reference, I just grabbed a few.
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Old 15th December 2017, 03:50 PM   #373
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
If anyone can find deals on the special RCA jacks that would be appreciated. They are currently circa $9ea from mainstream dealers. Actually, I am having a hard time finding them.

Part No: 12HP059-BLACK

Part No: 12HP059-RED

Article No LCHQRCA

Priced $9.89/pair from Hificollective. Could not find on their website.

I wondering if this can work?

RCJ-022 CUI Inc. | Connectors, Interconnects | DigiKey

Click the image to open in full size.

JPS64,
Can you please share with us what the 3D render of the RCA jack looks like so we can find a cheap substitute?

Or is this closer?

AKSA's Lender Preamp with 40Vpp Output


http://www.morethanall.com/upload/pr...ce67def498.pdf

Here is the PCB pattern for the above jack.
AKSA's Lender Preamp with 40Vpp Output-rca-pcb-pattern-png
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File Type: png RCA-PCB-pattern.png (15.7 KB, 425 views)
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Last edited by xrk971; 15th December 2017 at 04:13 PM.
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Old 15th December 2017, 05:21 PM   #374
JPS64 is offline JPS64  Germany
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AKSA's Lender Preamp with 40Vpp Output
Hello X,

sorry really sick this week.

Still waiting for Minimelf set.

How much RCA do we need?

Ill work on a cheaper replacement solution.

JP
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Old 15th December 2017, 05:31 PM   #375
JPS64 is offline JPS64  Germany
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AKSA's Lender Preamp with 40Vpp Output
Info: the schematics reference is for Audiophonics ELECAUDIO ones but are the same as supplied by HifiCollective and all Chinese ones.

JP
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Old 15th December 2017, 05:35 PM   #376
JPS64 is offline JPS64  Germany
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AKSA's Lender Preamp with 40Vpp Output
Hello X,

do youve a price for a pair from Morethanall?

Weve three solutions:
- GB for right RCA PCB high quality but depends on demand
- cheap RCA but will check first PCB replacement and its IMHO a bad choice then good preamplifier but bad connectors
- standard rear plate mounted RCA connector connected to PCB using wire

JP
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Old 15th December 2017, 05:49 PM   #377
jwjarch is offline jwjarch  United States
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JPS,

I was just thinking about the standard RCA's connected with CAT-5/6. Maybe a little more work but shouldn't hurt signal quality in any way, correct?
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Old 15th December 2017, 06:08 PM   #378
JPS64 is offline JPS64  Germany
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AKSA's Lender Preamp with 40Vpp Output
@jwjarch

Its OK. If short distance between RCA and PCB I would go with simple wire (like Mr. Pass designs).

OK, here a solution:
- use 2p. header, the same as used for X141 to replace all RCA on PCB (2.54mm pitch)
- use assembled 2 wire socket (short length if necessary)
- twist the cable and solder directly on RCA socket (use shrinking tube for isolation and secure fixation)

Photo attached (showing technique for Pass HPA Ive built).

JP
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File Type: jpg IMG_1548.JPG (485.1 KB, 205 views)
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Old 15th December 2017, 06:33 PM   #379
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Quote:
- use assembled 2 wire socket (short length if necessary)
- twist the cable and solder directly on RCA socket (use shrinking tube for isolation and secure fixation)
This works well for me and lets me use the standard RCA panel jacks I have already have. So to confirm, the pitch for the pins is 2.5mm and standard 2pin JST PCB connector can be used here?

Are those Morthenal connectors the correct size? I will have to see if they are even in stock.

Edit: I don't have boards in front of me - I will look at it closely as soon as I can.
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Last edited by xrk971; 15th December 2017 at 06:42 PM.
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Old 15th December 2017, 06:46 PM   #380
JPS64 is offline JPS64  Germany
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AKSA's Lender Preamp with 40Vpp Output
Hi X,

Used connector on PCB pitch = 2.5mm - Molex, Hirose, JST = 2.54mm.

Morthenal or AEC Connectors (inquiry done) are the right connectors.

JP
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