TAC Matchless overhaul - advice needed

Archived from groups: rec.audio.pro (More info?)

Matchless <Tac@matchless.com> wrote:
>I'm begining an overhaul of my 18 year old TAC Matchless. The thing's in
>pretty good shape, but needs a few op-amps & caps replacing.
>
>I'm slightly confused over a few things & can't seem to google up the
>required answers, so any help appreciated.
>
>Firstly, I've found a couple of duff opamps in the eq sections of a couple
>of channels. The fitted opamps are TL072CP. What's the difference between
>TL072CP & CN (which I can pick up locally easily)? Can I fit the TL072CN as
>a straight swap? Can anyone recommend an upgrade for these IC's that are a
>straight plug & play swap?

They are both plastic DIP packages. The N has better heat dissipation and
is good at higher temperatures than the cheaper P package.

>Secondly, Is it only electrolytic caps that go bad with age, or am I
>looking at replacing some of the paper or bead types too?

You will not find any paper caps in a console of that vintage. The
"bead types" are tantalums, which are really electrolytics in disguise.
However, they are more apt to fail rapidly than slowly like aluminums do.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Archived from groups: rec.audio.pro (More info?)

blund@comcast.net wrote in news:56qdncubvsh3zFDfRVn-uA@comcast.com:

> I just emailed these schematics to your TAC@Matchless.Com address
>

Hi, That's a bogus address, any chance of sending them to TAC(at)
noize.plus.com ?

Thanks a lot!