What happened ..???

[budkor]

Hi All

I found, and dug out this old Midi from the early 80s from the loft. It was covered in dust everywhere. I cleaned it up, hooked up to speakers and powered on. It was playing, but only one channel. The other channel was dead.

I thought maybe it need some switch cleaner on the volumne pot. I left it on with the volume down (the set was on all the time with just volume down), and one the second day, I put the volume up, it was the same, no sound from one channel. .... the third day same.. fourth day same.. but on fifth day, when I put the volume up, the both channel was working. It is all normal, and sounds great.

It's been working perfect for now for a few days - almost a week. What was wrong and what has brought this set back to working OK?

The midi is JVC DR-E31LBK and it had 5 graphic equaliser including balance and surround sound button as well. Hooked up to a 70s vintage huge Mordaunt Short MS400, it sounds amazingly good.

TIA.

[budkor]

Here is the photo of the midi with CDP.

[h_a]

Old gear often has aged caps (lost their initial capacitance and/or their impedance increased by decades) that get a bit reformed during a few days (or hours) on the line. Could be your case here.

If you want to keep the JVC running at its best, it's anyway a good idea to at least change the power supply caps (ideally all electrolytics).

Hannes

[Mooly]

Intermitent balance pot maybe or relays in speaker outputs. Something "mechanical" like that is the most likely problem.