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AKSA's Lender Preamp with 40Vpp Ouput GB
AKSA's Lender Preamp with 40Vpp Ouput GB
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Old 29th November 2017, 10:25 PM   #21
xrk971 is online now xrk971  United States
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Location: Metro DC area
AKSA's Lender Preamp with 40Vpp Ouput GB
Group Buy Status Update

Quote:
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
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Old 30th November 2017, 04:53 AM   #22
lydlaug is offline lydlaug  Norway
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Join Date: Nov 2004
Location: Stavanger
AKSA's Lender Preamp with 40Vpp Ouput GB
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
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Old 30th November 2017, 05:29 AM   #23
lydlaug is offline lydlaug  Norway
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Join Date: Nov 2004
Location: Stavanger
AKSA's Lender Preamp with 40Vpp Ouput GB
Ohh, I forgot...1 set SMT
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Old 30th November 2017, 12:15 PM   #24
muthumuthiah is offline muthumuthiah  India
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Join Date: Sep 2015
Location: Bangalore
AKSA's Lender Preamp with 40Vpp Ouput GB
1 set SMT
muthumuthiah - 1 set TH
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Old 30th November 2017, 03:34 PM   #25
xrk971 is online now xrk971  United States
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Join Date: Oct 2012
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AKSA's Lender Preamp with 40Vpp Ouput GB
Default AKSA's Lender Preamp with 40Vpp Ouput GB

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:
Click the image to open in full size.

Implementation in SMT/TH prototype:
Click the image to open in full size.

Demonstration of 40vpp output into 25kohm:
Click the image to open in full size.

Measured performance 20vpp into 7kohm (with 21.6dB gain):
Click the image to open in full size.

4vpp into 7kohm gives 0.0011% THD:
Click the image to open in full size.

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.

Click the image to open in full size.

TH Daughterboard:
Click the image to open in full size.

Click the image to open in full size.

SMT Daughterboard:
Click the image to open in full size.

Metal-core (IMS) Daughterboard PCB:
Click the image to open in full size.

Main PCB Data files (schematic, parts list/BOM, layout snapshots, Gerbers):
http://www.diyaudio.com/forums/attac..._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/attac...er-pre-tht-zip

SMT Data files:
http://www.diyaudio.com/forums/attac...er-pre-smd-zip

IMS data files:
http://www.diyaudio.com/forums/attac...er-pre-ims-zip

SMT & IMS Daughterboard Parts List/BOM:
http://www.diyaudio.com/forums/attac..._or_smd_pl-zip

TH Daughterboard Parts List/BOM:
http://www.diyaudio.com/forums/attac...er-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:

Quote:
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
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio

Last edited by xrk971; 30th November 2017 at 04:56 PM.
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Old 1st December 2017, 11:01 AM   #26
xrk971 is online now xrk971  United States
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Join Date: Oct 2012
Location: Metro DC area
AKSA's Lender Preamp with 40Vpp Ouput GB
GB Status Update:

Quote:
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?
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Old 1st December 2017, 11:16 AM   #27
Algar_emi is offline Algar_emi  Canada
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Join Date: Oct 2002
Location: Canada, Qc
AKSA's Lender Preamp with 40Vpp Ouput GB
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
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Old 1st December 2017, 11:24 AM   #28
arthur is offline arthur
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Join Date: Oct 2001
Location: .
AKSA's Lender Preamp with 40Vpp Ouput GB
sorry for being late
can add me 2 sets of smd pcbs?
thanks

Last edited by arthur; 1st December 2017 at 11:26 AM.
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Old 1st December 2017, 12:25 PM   #29
xrk971 is online now xrk971  United States
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AKSA's Lender Preamp with 40Vpp Ouput GB
Quote:
Originally Posted by Algar_emi View Post
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.
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Last edited by xrk971; 1st December 2017 at 12:29 PM.
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Old 1st December 2017, 12:44 PM   #30
bvtrinh is online now bvtrinh  United States
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Join Date: Sep 2014
Default 2nd set

Quote:
Originally Posted by xrk971 View Post
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
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