At last I’ve completed my build. All work fine. I’ve made a ghetto case from some scrap shelves, not the best but I’ll make a better case later or buy a metal case from zthee. Not decided yet. Just needed to hold the TTSH in something to being able to calibrate and play it.
Some more advancement on the mixing desk front…
Replaced the NJM4580 I thought was the culprit and no changes. gah
I also made a new cable that connects the main board and the input board but it’s not that either.
Next plan is to change the two 2SC2878 responsible for the muting of the Mix-B channel. I read on a HiFi forum that when they fail they put DC in the audio path. Sounds like my problem….
So I ordered some and waiting again for delivery.
Next things to fix / restore are:
– a dead channel on one of the voice boards.
– a deep clean up of all the sliders. They are filled with dust and gunk. yak
– Find a way to restore the color of the knobs. they all gone yellow and the grey ones are in the same state. Peroxide + UV treatment ahead…
– Get the whole thing back together. hm, hope i will remember what screw goes where… The damn thing has been sitting on my dining table for more than a month now…
And it will be done i think
Further testing on the main board (right ). I think I’ve located the problem, one of the 4580 in the Mix-B path is at 14.80v on all it’s pins… Gonna swap that with a new one and see if it changes anything.
To do so i’ve bought a desoldering station so i’m waiting on it to be delivered.
