AKSA's Lender Preamp with 40Vpp Ouput GB

[xrk971]

Group Buy Status Update

JPS64 -2 sets w/ SMT daughterboards, Paid
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, Paid
Johnny2Bad 1 set TH; 1 set SMT, Paid
vvs07 - 2 sets TH, Paid
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
Prasi - 1 set TH, Paid
Private buyer - 1 set TH, Invoice sent
—— Waiting List - please add name below ——
*Algar Emi - 1 set, TH, Invoice sent
*Fabian85 - 1 set SMT, Need PayPal address

 

[lydlaug]

JPS64 -2 sets w/ SMT daughterboards, Paid
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, Paid
Johnny2Bad 1 set TH; 1 set SMT, Paid
vvs07 - 2 sets TH, Paid
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
Prasi - 1 set TH, Paid
Private buyer - 1 set TH, Invoice sent
—— Waiting List - please add name below ——
*Algar Emi - 1 set, TH, Invoice sent
*Fabian85 - 1 set SMT, Need PayPal address
Lydlaug

 

[lydlaug]

Ohh, I forgot...1 set SMT

 

[muthumuthiah]

1 set SMT
muthumuthiah - 1 set TH

 

[xrk971]

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:

Main PCB Data files (schematic, parts list/BOM, layout snapshots, Gerbers):
http://www.diyaudio.com/forums/atta...vpp-output-aksa-lender-pre-main_all_datas-zip

BOM for each board can be found as Excel file in zip data files below.

TH Daughterboard Data files:
http://www.diyaudio.com/forums/atta...eamp-40vpp-output-diy-aksa-lender-pre-tht-zip

SMT Data files:
http://www.diyaudio.com/forums/atta...eamp-40vpp-output-diy-aksa-lender-pre-smd-zip

IMS data files:
http://www.diyaudio.com/forums/atta...eamp-40vpp-output-diy-aksa-lender-pre-ims-zip

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

*****
Pricing for GB

Motherboard (155mm x 157mm) and 1 set (2 pieces ea) of your choice TH or SMT Daughterboards (ca. 30mm x 40mm) is $20.

Shipping in USA in $5, Canada is $10, everywhere else is $15.

Initial GB will be 30 sets.

Current running list of GB participants:

JPS64 - 1 set SMT, Paid
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, Paid
Johnny2Bad 2 sets total 1 TH & 1 SMT, Paid
vvs07 - 2 sets TH, Paid
PCGAB - 1 Set SMT, Paid
Harry3 - 1 set MB plus TH, Paid
Wayne1 - 1 set TH, Paid
obh - 1 Set 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
Prasi - 1 set TH, Paid
*muthumuthiah - 1 set TH, Invoice sent
*Lydlaug - 1 set SMT, Please send PayPal address

—— Waiting List - please add name below ——
Algar Emi - 1 set, TH
Fabian85 - 1 set SMT

 

[xrk971]

GB Status Update:

JPS64 - 1 set SMT, Paid
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, Paid
Johnny2Bad 2 sets total 1 TH & 1 SMT, Paid
vvs07 - 2 sets TH, Paid
PCGAB - 1 Set SMT, Paid
Harry3 - 1 set MB plus TH, Paid
Wayne1 - 1 set TH, Paid
obh - 1 Set 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
Prasi - 1 set TH, Paid
muthumuthiah - 1 set TH, Paid
*Lydlaug - 1 set SMT, Invoice sent

—— Waiting List / or possible GB #2 - please add name below ——

Kokanee - 2 sets total 1 TH and 1 SMT
Algar Emi - 1 set, TH
Fabian85 - 1 set SMT

Algar_Emi, Fabian85, do you stil have interest or should I remove you completely as have not heard from you after several attempts via PM/email?

 

[Algar_emi]

Hi. I was away a few days, without internet access, and it seems my order on the list was cancelled... I'm only back on the waiting list? I was one of the first on the list... Let me know on the forum email (not my PayPal address) if a set is available, TH or SMT. BTW my PayPal address is an old email address that i don,t consult often, hence the confusion probably, so contact me by this forum email first. Thanks
SB

 

[arthur]

sorry for being late
can add me 2 sets of smd pcbs?
thanks

 

[xrk971]

Hi. I was away a few days, without internet access, and it seems my order on the list was cancelled... I'm only back on the waiting list? I was one of the first on the list... Let me know on the forum email (not my PayPal address) if a set is available, TH or SMT. BTW my PayPal address is an old email address that i don,t consult often, hence the confusion probably, so contact me by this forum email first. Thanks
SB

Sorry about that Algar, I will move you to first on waiting list. I am hoping that I will have some flexibility once boards are delivered. Sometimes they throw in an extra board. I will also contact a few people on list who I think may be willing to give theirs up for this time.

 

[bvtrinh]

2nd set

Sorry about that Algar, I will move you to first on waiting list. I am hoping that I will have some flexibility once boards are delivered. Sometimes they throw in an extra board. I will also contact a few people on list who I think may be willing to give theirs up for this time.

Hello X,

You can give Algar the second set I purchased.

Bao

 

[Algar_emi]

Thanks 😉 SB

 

[xrk971]

GB Status Update

JPS64 - 1 set SMT, Paid
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, Paid
Johnny2Bad 2 sets total 1 TH & 1 SMT, Paid
vvs07 - 2 sets TH, Paid
PCGAB - 1 Set SMT, Paid
Harry3 - 1 set MB plus TH, Paid
Wayne1 - 1 set TH, Paid
obh - 1 Set TH, Paid
PJN - 1 set TH, Paid
manniraj - 1 set TH, Paid
* Erik777 - 1 set TH, give up for Algar_Emi
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
Prasi - 1 set TH, Paid
muthumuthiah - 1 set TH, Paid
*Lydlaug - 1 set SMT, Invoice sent
*Algar Emi - 1 set, TH, Invoice sent

—— Waiting List / or possible GB #2 - please add name below ——

Kokanee - 2 sets total 1 TH and 1 SMT
Thimios - 1 set SMT
Fabian85 - 1 set SMT

Bvtrinh, thank you for your kind offer, but Erik777 had already agreed to give his up.

Thanks, Erik777.

 

[Algar_emi]

Thanks again Erik777, invoice Paid 😉

 

[xrk971]

I just got word that the boards are almost done and may ship out as early as end of today (tomorrow in China). So I should have boards in maybe 5-7days. Better start ordering the BOM.

 

[pinnocchio]

I would like 1 set SMT please

 

[xrk971]

GB Status Update

JPS64 - 1 set SMT, Paid
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, Paid
Johnny2Bad 2 sets total 1 TH & 1 SMT, Paid
vvs07 - 2 sets TH, Paid
PCGAB - 1 Set SMT, Paid
Harry3 - 1 set MB plus TH, Paid
Wayne1 - 1 set TH, Paid
obh - 1 Set TH, Paid
PJN - 1 set TH, Paid
manniraj - 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
Prasi - 1 set TH, Paid
muthumuthiah - 1 set TH, Paid
*Lydlaug - 1 set SMT, Invoice sent
Algar Emi - 1 set, TH, Paid

—— Waiting List / or possible GB #2 - please add name below ——

Kokanee - 2 sets total 1 TH and 1 SMT
Thimios - 1 set SMT
Fabian85 - 1 set SMT
Pinnocchio - 1 set SMT

We have 5 sets so far on potential GB #2. If I can get at least 5 more people interested I can order the boards for the next GB. So please spread the word and invite your friends and pals who are unaware of this GB. It's a a very nice preamp, I can assure you. The best sounding one I have heard in fact.

 

[Mituisho]

Please count me in for one set smt.

 

[Alarudin]

Count me in for a Th set thanks

Regards,
Askae

 

[xrk971]

GB Status Update:

JPS64 - 1 set SMT, Paid
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, Paid
Johnny2Bad 2 sets total 1 TH & 1 SMT, Paid
vvs07 - 2 sets TH, Paid
PCGAB - 1 Set SMT, Paid
Harry3 - 1 set MB plus TH, Paid
Wayne1 - 1 set TH, Paid
obh - 1 Set TH, Paid
PJN - 1 set TH, Paid
manniraj - 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
Prasi - 1 set TH, Paid
muthumuthiah - 1 set TH, Paid
*Lydlaug - 1 set SMT, Invoice sent
Algar Emi - 1 set, TH, Paid

—— Waiting List / or possible GB #2 - please add name below ——

Kokanee - 2 sets total 1 TH and 1 SMT
Thimios - 1 set SMT
Fabian85 - 1 set SMT
Pinnocchio - 1 set SMT
Mituisho - 1 set SMT
Alurudin - 1 set TH

Ok, thanks Mituisho and Alurudin! 3 more to go and GB #2 will be on its way.

 

[xrk971]

GB Status update

JPS64 - 1 set SMT, Paid
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, Paid
Johnny2Bad 2 sets total 1 TH & 1 SMT, Paid
vvs07 - 2 sets TH, Paid
PCGAB - 1 Set SMT, Paid
Harry3 - 1 set MB plus TH, Paid
Wayne1 - 1 set TH, Paid
obh - 1 Set TH, Paid
PJN - 1 set TH, Paid
manniraj - 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
Prasi - 1 set TH, Paid
muthumuthiah - 1 set TH, Paid
*Lydlaug - 1 set SMT, Invoice sent
Algar Emi - 1 set, TH, Paid

—— Interest List for GB #2 - please add name below ——

Kokanee - 2 sets total 1 TH and 1 SMT
Thimios - 1 set SMT
Fabian85 - 1 set SMT
Pinnocchio - 1 set SMT
Mituisho - 1 set SMT
Alurudin - 1 set TH
muthumuthiah - 3 sets all TH, ship all with order from GB #1

I do believe I have enough interest to get GB #2 going now. Lets give it a few more days and then I will send out invoices to the above waiting list. Please PM me your PayPal address if you have not done so already.

Thanks,
X