Post your Solid State pics here.

[kct]

Very nicely made. Please post more pictures of your progress.

Here is another beauty shot of mine...

Cheers

[Federmann]

Far Side

[ostripper]

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

[fotios]

Originally Posted by ostripper

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

[ostripper]

(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

[Hoya Fan]

I found it curbside.

[ostripper]

Originally Posted by Hoya Fan

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

[Hoya Fan]

Originally Posted by ostripper

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.

[ostripper]

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

[Hoya Fan]

Originally Posted by ostripper

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