AKSA's Lender Preamp with 40Vpp Ouput GB

[xrk971]

Edit Jan 27, 2020: I am getting good questions from some members who are just building this preamp now. Here are some links to the BOM for the MB and the tricky to get right rotary switch and Micromatch connectors and 8-pin cable:

The MB BOM is here:
http://www.diyaudio.com/forums/atta...vpp-ouput-gb-aksa-lender-mb_pl_04_01_2018-zip

The cable is the 8 pin Male-Male:2205062-2 TE Connectivity / AMP | Mouser

The jack on the PCBs for the cable are female 8 position (one on each end):2178710-8 TE Connectivity | Mouser

The rotary switch is not stocked at Mouser. I ended up getting it on eBay - seearch for Lorlin CK1051

To order Preamp Boards please order from my Etsy Shop here:
Aksa Lender SE Class A Preamp

From old thread..
It does seem that there is interest in a GB. The nice thing with this design is choice of SMD or through hole on amp core daughterboard. I have not priced those yet but they are small so probably $5 for 10. Is anyone interested in the metal core version? That would allow increased bias to use as headphone amp.

--------------- NEW GB THREAD STARTS HERE ------------------

Link to basics of this preamp starts in post 25:

AKSA's Lender Preamp with 40Vpp Ouput GB - Page 3 - diyAudio

I was asked to move the GB aspects of this preamp here. Thanks to Hugh Dean (AKSA), Keantoken, and JPS64 for making this possible.

The original thread describing this preamp is here:

AKSA's Lender Preamp with 40Vpp Output

Basic schematic of through hole prototype version:

Implementation in SMT/TH prototype:

Demonstration of 40vpp output into 25kohm:

Measured performance 20vpp into 7kohm (with 21.6dB gain):

4vpp into 7kohm gives 0.0011% THD:

Layout design by JPS64 for Main PCB with CLC filter, & cap Mx PSU portion, Input selector, daughterboard sockets for amp cores, and peripheral output caps etc.

TH Daughterboard:

SMT Daughterboard:

Metal-core (IMS) Daughterboard PCB:

Alert - error on main PCB. R141 Should be 10k not 220R.

Alert - error on main PCB diode V141 should be standard 1N400X not breakdown or zener.

Alrert - error on MELF SMT BOM, R102 and R103 are swapped. R102 should be 33k and R102 should be 10k on the MELF SMT v001 PCB.

Revised BOM for MB (8-pin connector was incorrect), file here:
http://www.diyaudio.com/forums/atta...vpp-ouput-gb-aksa-lender-mb_pl_04_01_2018-zip

Mainboard schematic looks like this (note R141 is 10k not 220R):

Schematic for Mainboard here:
http://www.diyaudio.com/forums/atta...-preamp-40vpp-output-diy-aksa-lender-main-zip

Schematic for Through-Hole Daughterboard:

Stuffing Guide for TH amp daughterboard:

Schematic for SMT Daughterboard (updated V2 correct for silkscreen error from V1 - R102/103 were swapped, corrected now):

SMT & IMS Daughterboard Parts List/BOM:
http://www.diyaudio.com/forums/atta...-output-diy-aksa-lender-pre-ims_or_smd_pl-zip

TH Daughterboard Parts List/BOM:
http://www.diyaudio.com/forums/atta...r-preamp-40vpp-output-aksa-lender-pre-tht-zip

****
Please place orders in Etsy shop.

Edit Dec 8, 2017 - GB1 MB and TH board test:

Both SMT and TH daughterboards verified to work:

Playing in stereo with TH and SMT:

FFT of SMT for 20Vpp into 7kohms is THD of 0.001%:

Edit (Dec 2, 2018) - Latest measurements with MELF board...

4Vpp into 7kohms (45v Vcc):

20Vpp into 7kohms (45v Vcc):

40Vpp into 7kohms (50v Vcc):

51.4Vpp into 7kohms (59v Vcc):

Maybe thread title should be renamed to 51v? 🙂

Edit Jan 16, 2018: Aksa Lender as very nice HPA:

2.0Vpp into 50ohms with HPA (title is a typo):

Edit April 16: Recent review by DrPro. http://www.diyaudio.com/forums/anal...ender-preamp-40vpp-output-58.html#post5407342

Edit April 9, 2024: I have received word that many of the links to the BOM and stuffing diagrams etc may not be working anymore diue to the change in DIYA backend software a year or so ago. I am putting stuff below here as I get requests:

Stuffing Diagram and Schematic for the 0805/1206 SMT PCB:

BOM for 0805/1206 SMD board:

Qty Value Device Package Parts Description MFG MFG_PN 1​ 100R ERA6AEB3092V ERA6A R8 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 1​ 100µ CPOL-EUG PANASONIC_G C1 POLARIZED CAPACITOR, European symbol 1​ 10R0 R-EU_R1206 R1206 R14 RESISTOR, European symbol 2​ 10k0 ERA6AEB3092V ERA6A R2, R100 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 1​ 10k0 R0207-SMD R0207-SMD R10 1​ 1k0 ERA6AEB3092V ERA6A R11 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 1​ 1k8 ERA6AEB3092V ERA6A R4A 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 1​ 220R ERA6AEB3092V ERA6A R7 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 1​ 270R ERA6AEB3092V ERA6A R16 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 2​ 33R0 ERA6AEB3092V ERA6A R5, R6 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 1​ 33k0 ERA6AEB3092V ERA6A R1 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 1​ 33p GRM21BR71C225KA12L C0805 C5 2µ2, 16V, X7R, 0805 MURATA GRM21BR71C225KA12L 1​ 470R ERA6AEB3092V ERA6A R12 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 1​ 47R0 R-EU_R1206 R1206 R15 RESISTOR, European symbol 2​ 47µ0 CPOL-EUF PANASONIC_F C2, C3 POLARIZED CAPACITOR, European symbol 1​ 68k0 ERA6AEB3092V ERA6A R9 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 1​ 6k8 ERA6AEB3092V ERA6A R4B 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 1​ 9k1 ERA6AEB3092V ERA6A R3 30k9, 100V, 125mW, 0.1%, 25ppm, 0805 PANASONIC ERA6AEB3092V 2​ BC860C BC860C SOT23_BEC Q1, Q2 1​ BSP129 BSP129 SOT223 Q5 1​ DZT5401 BCP53 SOT223 Q4 1​ FJV1845 FJV1845 SOT23_BEC Q3 1​ TS4148 TS4148-0805-RY V0805 D1 3​ TSM-103-01-L-SH TSM-103-01-L-SH TSM-103-01-L-SH X1, X2, X3

See Zip file below for SMD 0805/1206 BOM in .XLSX format

 

[xrk971]

GB interest

So far we have the following interested members, please quote message and edit with your name and qnty and type if interested.

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
Jacques Antoine - 1 set TH

 

[silasmellor]

So far we have the following interested members, please quote message and edit with your name and qnty and type if interested.

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT

 

[bvtrinh]

GB

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH

 

[ggetzoff]

X,

Put me on list for a TH. Thanks for all you do for the forum. 😉

Cheers,

Greg

 

[Aatto]

count me in for a set as well, SMT.

 

[tubesguy]

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH

 

[tubesguy]

"please quote message and edit with your name and qnty and type if interested"

Under "Quick Reply":
Copy and paste.
Hit enter for new line.
Type your username and what you want.
Hit "post quick reply"
Boom! You're done.

 

[Johnny2Bad]

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH
Aatto - 1 set SMT
Mordikai - 1 set TH
Johnny2Bad 1 set TH; 1 set SMT

 

[xrk971]

Johnny2Bad, do you mean 2 separate motherboards one each with SMT and other with TH? Or 1 motherboard and 1 set ea of SMT and TH daughterboards?

 

[vvs07]

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH
Aatto - 1 set SMT
Mordikai - 1 set TH
Johnny2Bad 1 set TH; 1 set SMT
vvs07 - 2 sets TH

Thank you!

 

[Fabian85]

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH
Aatto - 1 set SMT
Mordikai - 1 set TH
Johnny2Bad 1 set TH; 1 set SMT
vvs07 - 2 sets TH
Fabian85 - 1 set SMT

 

[xrk971]

X
I have sent you an email.

I received your payment (thanks) but no email, was there a separate email?

 

[xrk971]

Okay, if there is an extra set available, I would like to purchase it. Thank you!

Sure, no problem. I will send you another invoice. There will only be a nominal charge for shipping due to increased weight as these are relatively heavy.

 

[xrk971]

GB status update...

JPS64 -2 sets w/ SMT daughterboards, Paid
*Algar Emi - 1 set, TH, Invoice sent
Redarc12 - 1 set, TH, Paid
CFT - 1 set, TH, Paid
Jacques Antoine - 1 set TH, Paid
Silasmellor - 1 set THT, Paid
Bvtrinh- 1 set TH, Paid
*bvtrinh - 1 set TH (second set), Invoice sent
*ggetzoff - 1 set TH, Invoice sent
tubesguy - 1 set TH, Paid
Aatto - 1 set SMT, Paid
*Mordikai - 1 set TH, Need PayPal address
*Johnny2Bad 1 set TH; 1 set SMT, Invoice sent
vvs07 - 2 sets TH, Paid
*Fabian85 - 1 set SMT, Need PayPal address
PCGAB - 1 Set(MB) with SMT boards, Paid
Harry3 - 1 set MB plus TH, Paid
Wayne1 - 1 set TH, Paid
obh - 1 Set(MB) plus TH, Paid
PJN - 1 set TH, Paid
manniraj - 1 set TH, Paid
Erik777 - 1 set TH, Paid
Zman01 - 1 set SMT, Paid
AKSA - 1 set SMT, Paid
xrk971 - 1 set SMT, Paid
spind - 1 set TH, Paid

 

[Harry3]

I received your payment (thanks) but no email, was there a separate email?

Thanks X.
I meant that I sent you an email with my PayPal/ delivery address.
Looking forward to seeing a BOM.

 

[xrk971]

Group Buy Update

JPS64 -2 sets w/ SMT daughterboards, Paid
*Algar Emi - 1 set, TH, Invoice sent
Redarc12 - 1 set, TH, Paid
CFT - 1 set, TH, Paid
Jacques Antoine - 1 set TH, Paid
Silasmellor - 1 set THT, Paid
Bvtrinh- 1 set TH, Paid
bvtrinh - 1 set TH (second set), Paid
ggetzoff - 1 set TH, Paid
tubesguy - 1 set TH, Paid
Aatto - 1 set SMT, Paid
*Mordikai - 1 set TH, Need PayPal address
Johnny2Bad 1 set TH; 1 set SMT, Paid
vvs07 - 2 sets TH, Paid
*Fabian85 - 1 set SMT, Need PayPal address
PCGAB - 1 Set(MB) with SMT boards, Paid
Harry3 - 1 set MB plus TH, Paid
Wayne1 - 1 set TH, Paid
obh - 1 Set(MB) plus TH, Paid
PJN - 1 set TH, Paid
manniraj - 1 set TH, Paid
Erik777 - 1 set TH, Paid
Zman01 - 1 set SMT, Paid
AKSA - 1 set SMT, Paid
xrk971 - 1 set SMT, Paid
spind - 1 set TH, Paid

So I still have not heard from Algar_emi, Fabian85, or Mordikai yet. Thank you to all the other folks who have sent payment.

 

[schlomoff]

Group Buy Update

JPS64 -2 sets w/ SMT daughterboards, Paid
*Algar Emi - 1 set, TH, Invoice sent
Redarc12 - 1 set, TH, Paid
CFT - 1 set, TH, Paid
Jacques Antoine - 1 set TH, Paid
Silasmellor - 1 set THT, Paid
Bvtrinh- 1 set TH, Paid
bvtrinh - 1 set TH (second set), Paid
ggetzoff - 1 set TH, Paid
tubesguy - 1 set TH, Paid
Aatto - 1 set SMT, Paid
*Mordikai - 1 set TH, Need PayPal address
Johnny2Bad 1 set TH; 1 set SMT, Paid
vvs07 - 2 sets TH, Paid
*Fabian85 - 1 set SMT, Need PayPal address
PCGAB - 1 Set(MB) with SMT boards, Paid
Harry3 - 1 set MB plus TH, Paid
Wayne1 - 1 set TH, Paid
obh - 1 Set(MB) plus TH, Paid
PJN - 1 set TH, Paid
manniraj - 1 set TH, Paid
Erik777 - 1 set TH, Paid
Zman01 - 1 set SMT, Paid
AKSA - 1 set SMT, Paid
xrk971 - 1 set SMT, Paid
spind - 1 set TH, Paid
schlomoff-1set mb,1set th

 

[xrk971]

Hi Schlomoff, you got the last set of the 30. Please send me your PayPal address.

If anyone else would like one, please add your name and you will be on waiting list. I will then give the few names left who have not responded one more chance, then will give people on waiting list the remaining sets.

 

[xrk971]

GB status update.

JPS64 -2 sets w/ SMT daughterboards, Paid
*Algar Emi - 1 set, TH, Invoice sent
Redarc12 - 1 set, TH, Paid
CFT - 1 set, TH, Paid
Jacques Antoine - 1 set TH, Paid
Silasmellor - 1 set THT, Paid
Bvtrinh- 1 set TH, Paid
bvtrinh - 1 set TH (second set), Paid
ggetzoff - 1 set TH, Paid
tubesguy - 1 set TH, Paid
Aatto - 1 set SMT, Paid
*Mordikai - 1 set TH, Invoice sent
Johnny2Bad 1 set TH; 1 set SMT, Paid
vvs07 - 2 sets TH, Paid
*Fabian85 - 1 set SMT, Need PayPal address
PCGAB - 1 Set(MB) with SMT boards, Paid
Harry3 - 1 set MB plus TH, Paid
Wayne1 - 1 set TH, Paid
obh - 1 Set(MB) plus TH, Paid
PJN - 1 set TH, Paid
manniraj - 1 set TH, Paid
Erik777 - 1 set TH, Paid
Zman01 - 1 set SMT, Paid
AKSA - 1 set SMT, Paid
xrk971 - 1 set SMT, Paid
spind - 1 set TH, Paid
schlomoff- 1 set TH, Paid
—— Waiting List - please add name below ——

Fabian85 and Algar_Emi, please respond by 23:00UTC. I have several people interested in boards via PM. Thanks,
X