Sony amp problem

[jandl100]

I've a Sony TA-FB940R I've been using for a few days to drive Magneplanar 1.6QR speakers.

It has started fading in level and distorting, both on the R channel.

If I push the source-direct button it comes back to normal, then fades / distorts again after a minute or two.

Suggestions?

Only cost me £100 so not sure if it worth taking to a repair guy - they charge half that just to take it in the door!

[Clive]

Does the amp get warm? Just wondering if heat is influencing the switch contacts. Can't you get inside to short out the switch?

[struth]

The amp is maybe struggling with them. I think 100watt is the minimum

[Darren]

I own several pairs of maggies and they all love decent power amps with lots of current up em. Just look at the surface area you are trying to move.......

[agk]

Sounds like an output relay is giving up. I had this on an FA-30ES not so long ago. Repairable but I lost all confidence in the amp.

[jandl100]

Umm -- yes, the amp was getting rather warm - especially as I had the vents mostly covered up. :doh:

Darn thing was perfectly OK and barely made it to cool driving some Ushers.

Just didn't think about it when changing speakers. :oops:

Will let it cool off a bit then see what happens ....

[jandl100]

Sounds like an output relay is giving up. I had this on an FA-30ES not so long ago. Repairable but I lost all confidence in the amp.

Ah ....

[jandl100]

Will let it cool off a bit then see what happens ....

Nope. It's buggered. :(

OK on headphones, though.