Re: 70's stereo reciever (Monteverdi?) with flaking green ceramic disk capacitors

Caps have been replaced, and the sound is much better

There's still a faint hum at very high gain, but I'm pretty sure it's due to poor grounding practices rather than capacitors, and it's not bothersome at normal listening levels. The overall sound quality isn't that impressive; it was a cheap unit to start with, after all, but it's still better than the cheap bookshelf unit I've got in my office now. Maybe someday I'll be able to afford an actual HiFi system, but until then this is...

Re: 70's stereo reciever (Monteverdi?) with flaking green ceramic disk capacitors



Yes, I'm pretty sure that's what caused the rust; the worst rusted area is actually well away from any components that could have leaked. I do think that the greening ceramic caps are coated in <i>something</i>, because even the ones that are nowhere near the wax-covered part of the board show the flaking, and none of the other components surrounding them are coated in anything. I'm still not sure exactly what makes the green ones different from the orange ones, but when...

Re: 70's stereo reciever (Monteverdi?) with flaking green ceramic disk capacitors

Ok, I'll go ahead with the recapping and leave the ceramics alone. Thanks for the advice guys!

Re: 70's stereo reciever (Monteverdi?) with flaking green ceramic disk capacitors



Oh, I *know* those need to be replaced; like I said, if you look carefully a lot of them show signs of having leaked, and the ones that don't are probably dried out anyway. I plan to replace *all* of the electrolitics, on both boards.

The real question is, should I be replacing any of the ceramics as well. Basically, before I put in an order for some new caps, I want to make sure I'm ordering everything I'll need. It sounds like the consensus is that the ceramics are...

Re: 70's stereo reciever (Monteverdi?) with flaking green ceramic disk capacitors

budm, good call, here's pictures of the two boards, as well as the whole unit (the unit is right side up; the audio board is mounted component side down). I've labeled the suspect ceramic caps in the audio board image to correspond with the names of the images from the first post. You can't always tell from the photo, but a whole lot of the larger electrolitic caps look like they've leaked in one way or another when you inspect them closely (again, not surprising given its age, and the less-than-ideal...

So, I'm looking for help with an old stereo reciever (tuner+amp) that I'm trying to fix up; as best I can tell it's from the 70s (discrete components and hand soldering, but no vacuum tubes), and the best I can do to identify it is to say that a (badly worn) sticker seems to say "Monteverdi Model No: CG-4147", which I've found no references to online (other than the fact that apparently CG-4147 is the form you need to get tuition assistance for the US Coast Guard). Based on the construction, it was never a particularly high-end system, but I'd like to fix it up anyway, in large part...

Re: New Members - please post your introductions here

Hi all, I've made use of the info here in re-caping several things, so I figured I'd join officially so I can contribute. Current project is an old amplifier (best guess mid 70s) with some...unusual design "features," including the use of what appears to be desoldering braid used as a conductor to connect things. Fun times!