Harrison's old A4KD has a new home @ Kin's pad

Chris updated with some more repair work. Again I include his words to me RE the progress.

Originally Posted by :
Hi,
Still working on Audio issue. Im hoping to have that sorted by end of today. After replacing Post amp, sound is better but not right.
I have also repaired around 6 pieces of damaged track. The main issue now, is the post amp is missing -12v. So it sounds horrid.

Originally Posted by :
Hi,
Got sound working right now, from first op amp and it sound really good.
However one issue left with second op amp, one channel seems to be getting carried away. The voltage is incorrect, so the final output is alot louder.
Getting there, . Will send some pics, but please, dont pics as final. As I just tagged stuff on, to see if it worked. Will do a tidy up of board and components once its working perfect.

Originally Posted by :
Hi,
Not as easy as I had hoped, but getting there. Excuse the mess, as I said in ticket, just interested in getting it working, will do a nice tidy up on it later. I will try my best to make it, so no wire (used to repair track) is shown.

Originally Posted by :
Update on sound problem. I came back to it next day. Only to find the sound was popping.
So I need to hunt for more damaged track, . Ill be happy once I get the sound working perfectly.

[Reply]

Still a fingers crossed! Which I'm sure will work out fine

[Reply]

Probably, but it's looking like lots of tracks are damaged in the sound circuit and need replacing.

[Reply]

Another update.....

Originally Posted by :
Sorted crackling and popping, now hunting for secong op amp issue.
Could be related to non level -12v rail. Have to I have never seen damage like this, not even on the worst boards I have seen. Its physically eaten into the board itself.

....more carnage.

[Reply]

Wow. Does he have any idea why there was so much damage? Mad considering it was still working fine. It was always really well cared for too. Always in a dry warm environment, and setup and in regular use all the time I owned it. Very strange.

Does show that all our beloved retro hardware is at that age when it is all going to start breaking down and need some TLC and restoration.
[Reply]