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Old 1st May 2011, 03:49 PM   #1811
kct is offline kct  Canada
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Very nicely made. Please post more pictures of your progress.

Here is another beauty shot of mine...

Cheers
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Old 1st May 2011, 05:46 PM   #1812
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Far Side
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Old 2nd May 2011, 06:19 AM   #1813
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The "far side" ..... nice neat , compact SMD. Run dem babies , I wanna see a 120V p-p squarewave w/ 1uS rise

Oh , I feel so primitive I just had to enjoy a big glass of " vino" . I guess "no fine wine before it's time".... same with the DIY PCB's (below 1). First pair work fine , but have a slight thermal "issue" (but not a burning amp). Hopefully, this pair will work as good as they sound (thermally). I must fill that glass half way up to be truly subjective.

PS - PCB's are:starting left.... 2 X nikko PB120's (corrected version) and 2 X EX1.2 voltage stages (goldmund inspired). 1st PB120 is powered to test cap MUX'es. (below 2/3) the AX - being abused at 10Khz 60V p-p.

OS
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File Type: jpg nights work.jpg (540.2 KB, 1657 views)
File Type: jpg AX.jpg (236.6 KB, 1488 views)
File Type: jpg 60vp-p.jpg (216.4 KB, 1351 views)
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Old 4th May 2011, 10:53 AM   #1814
fotios is online now fotios  Greece
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Quote:
Originally Posted by ostripper View Post
The "far side" ..... nice neat , compact SMD. Run dem babies , I wanna see a 120V p-p squarewave w/ 1uS rise

Oh , I feel so primitive I just had to enjoy a big glass of " vino" . I guess "no fine wine before it's time".... same with the DIY PCB's (below 1). First pair work fine , but have a slight thermal "issue" (but not a burning amp). Hopefully, this pair will work as good as they sound (thermally). I must fill that glass half way up to be truly subjective.

PS - PCB's are:starting left.... 2 X nikko PB120's (corrected version) and 2 X EX1.2 voltage stages (goldmund inspired). 1st PB120 is powered to test cap MUX'es. (below 2/3) the AX - being abused at 10Khz 60V p-p.

OS
Nice score ostripper! Looking at the oscilloscope picture, my estimation is a rise time between 0.9 to 1.2μsec.
I would like to see a picture of your PCBs from the solder side.
FOS
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Old 6th May 2011, 07:20 AM   #1815
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Red face still 1 board away.

(below 1) is the solder side of the soon- to- go thermally unbalanced, but awesome sounding Nikko pb120's.
(below 2 - big board) is what I will have to do to get rock solid 60ma/device operation (fully separate heatsinks per amp). Nikko must of used ultra matched sankens + no base stoppers to get at least a close balance of idle current per device. Even in it's imperfect state , the amp can be pushed all day rail to rail with no issues. Unfortunately , I am a "perfectionist".

I will show the whole thing in a week with the "big board".

OS
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File Type: jpg pb120_2.jpg (573.8 KB, 515 views)
File Type: gif pb120-3.GIF (52.8 KB, 485 views)
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Old 6th May 2011, 03:41 PM   #1816
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Default Problematic Kenwood Super Eleven

I found it curbside.
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File Type: jpg Super Eleven 2.jpg (106.0 KB, 374 views)
File Type: jpg Super Eleven 3.jpg (86.5 KB, 350 views)
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Old 6th May 2011, 05:57 PM   #1817
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I found it curbside.
Fix it (schema attached) , it's a "pretty" receiver. Recap the power board , regrease the outputs (or replace with mj15003/4). If you were to make a new amp for it , design the PCB to be a exact replacement (no drilling). looks like the kenwood has a good, simple LIN topology EF2 AB amp with TO-3 outputs ... 55-0-55V PS ... typical.

OS
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Old 6th May 2011, 09:02 PM   #1818
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Quote:
Originally Posted by ostripper View Post
Fix it (schema attached) , it's a "pretty" receiver. Recap the power board , regrease the outputs (or replace with mj15003/4). If you were to make a new amp for it , design the PCB to be a exact replacement (no drilling). looks like the kenwood has a good, simple LIN topology EF2 AB amp with TO-3 outputs ... 55-0-55V PS ... typical.

OS
Ostripper:

Thanks for the information. I looked at replacement capacitors when I first found it. I admittedly need to get better with a soldering iron. Don't want to burn down the house.
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Old 12th May 2011, 05:45 PM   #1819
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Default Time for "fine wine" (California ?)

Finally it's done... What a PITA to redo a Nikko , no wonder others never concluded the job.
(attachment 1) is the wine /bottom , wired in the classic Japanese hi-fi style.
Yellow led is the main speaker relay board (protection to come soon)

(Attachment 2) is the top view , 2 PS's (65-0-65V and 58-0-58V) , nice and tidy.

(Attachment 3 ) is how I got this far , had to make a special board or go for bust. Each amp has it own heatsink , 10C - 35C / 13-14mv (60mA - all OP devices) ... perfect Vbe. Sound is VERY detailed , quite the punch .. as well !!

OS
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File Type: jpg finewine-amp.jpg (942.0 KB, 352 views)
File Type: jpg nikko-top.jpg (520.4 KB, 410 views)
File Type: jpg nikko-pcb.jpg (599.6 KB, 522 views)
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Old 12th May 2011, 07:21 PM   #1820
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Default That is very cool

Quote:
Originally Posted by ostripper View Post
Finally it's done... What a PITA to redo a Nikko , no wonder others never concluded the job.
(attachment 1) is the wine /bottom , wired in the classic Japanese hi-fi style.
Yellow led is the main speaker relay board (protection to come soon)

(Attachment 2) is the top view , 2 PS's (65-0-65V and 58-0-58V) , nice and tidy.

(Attachment 3 ) is how I got this far , had to make a special board or go for bust. Each amp has it own heatsink , 10C - 35C / 13-14mv (60mA - all OP devices) ... perfect Vbe. Sound is VERY detailed , quite the punch .. as well !!

OS
I first heard the Nikko line in the 1980s, when I was in college. Good stuff. You've gone the extra mile on that amplifier, ostripper.

Hoya Fan
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