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Old 9th May 2021, 11:21 pm   #1
Tyso_Bl
Hexode
 
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Join Date: Jul 2014
Location: Magor, Monmouthshire, Wales, UK.
Posts: 436
Default Trio KR-2090L Tuner amp / receiver

A quick write up, aquired this about 9 years ago, with a pile
of other audio gear, used it for a while and blew a small set of
speakers with it.

Powered it up a few days ago, nothing.

Two fuses inside one for the scale lamps (OK), and one in the mains primary which
had blown.

There were also three sick capacitors which had leaked over each other, there
was a 220uF which I didn't have so stuffed a 470uF in place instead.

Powered up again with a new fuse, got a nice snap and a wisp of smoke, one of
the half bridge rectifiers had given up.

Found a nearly identical replacement in the salvage rectifier drawer to
replace it with.

Replaced some wire links in the PSU with 56R resistors to act as fuses as
I didn't have another spare half bridge rectifier.

Also extracted to two smoothing/reservior caps and checked for leakage/shorts.etc
on an external supply, no fault found, replaced and powered up, metered supply
and everything looked sensible, but no sound.

Turns out the speaker switch is crudded up, bit of switch cleaner and some exercise
and I've got FM hiss. Add a bit of wire aerial and got reception, yay!

Turn up the volume a bit and my fusible 56R resistors start smoking, so turn it down
and leave it running fo a couple of hours, all OK.

Feeling brave remove the fusibles, and run it up, so far so good, no smoke and
plenty of volume.

The stereo/mono lamp has failed so replaced with an amber LED, no resistor needed,
there is a 120R in circuit already.

The scale lamp has also failed, it's crimped on to its feed wires, so it get cut off
and a capless 12v car dashboard bulb gets crimped on, exactly the same fit and size.

Couple of hours of soak testing while cleaning the knobs, facia, and so on.

All went back together without any srews lost or left over, looks nice, and
sounds nice.

The FM tuner seems to be very sensitive, the tuning action is smooth with a flywheel,
it's easy to forget how nice analog tuning can be...

The speakers used for testing were Philips metal cone things, a fiver from the
local Eco shop, perfectly adequate for desktop use.

Will get put to daily use, so hopefully no more neglect related faults.

T
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Old 10th May 2021, 8:51 am   #2
vinrads
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Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,737
Default Re: Trio KR-2090L Tuner amp / receiver

Hi well done getting it working again ,nice looking tuner amp , I to like the feel of a flywheel tuner , it's also handy to have pre sets , my wife likes radio two in the morning I can't stand it ,sounds more like radio one to me , my choice is radio four ,Mick.
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