Marantz 2500 restore

blhagstrom

Mad Scientist, fixer.
Subscriber
Fellow AK're found it on the next state over (OR).
We talked about a restore.

Arrival
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unpacked

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Missing:
1 scope knob
Volume knob
1 large knob (luckily the 2 piece knobs are all there)
2 face bolts
All cover screws (the few that were in there are wrong)

Bad things so far.
Broken speaker switch
Broken power switch.
SO those knobs are gone too.

No idea what they were doing to the dial!?!?!?
Tuner string off but looks intact.

Face is filthy but looks decent with only a couple small scratches.
 
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Oooh-weeeee! Somebody was a "mean mistreater" in this guy's past. The real bummer is the missing volume knob - very hard to find. WHere the heck were the hitch pin looking thingies?
 
Oooh-weeeee! Somebody was a "mean mistreater" in this guy's past. The real bummer is the missing volume knob - very hard to find. WHere the heck were the hitch pin looking thingies?


There's a fellow on that auction site who had some volume knobs machined/made up that are close.
He also had a bunch of 2385/2500 parts.
Good luck!!

Bob
 
Oooh-weeeee! Somebody was a "mean mistreater" in this guy's past. The real bummer is the missing volume knob - very hard to find. WHere the heck were the hitch pin looking thingies?

Hitch pins are Allen wrenches.
Some of the pieces in the parts bag are not for this.

The Allen wrenches may fit the knob set screws.
 
Got to the bench for a look-see.
Main fuse gone. Installed one.
Got high fan, so tranny is not shorted.
High fan is the soft start resistor blown.

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Dug out the spare resistor and installed it.
Pulled the power supply for a look. These are very nice, they just unplug.

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Looks OK, BUT there is a missing fuse. Installed one and slipped it back in so I can check with new soft start resister installed.
 
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Stopped to hang the dial string all back together.
Missing screws, missing indicator rail (I hear more parts were found and are being sent. Fingers crossed).
Managed to get the dial string back in place fairly quick. Hung the dial back in.


Tried it with 150W dim bulb.
No fan, half bright bulb, no lights.
Figures.

OK, into the amp itself.
First, remove the amp block.
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The heart of the beast.

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Amp dissection and check up.

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block open to access drivers, pre-drivers, etc.

Not a lot of dirt, but there was some.
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Boards pulled to access them and get at output connections

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Oddly enough, and a pleasant surprise is that all the amp checked out OK.
All transistors passed tests on the octopus. Emitter resisters OK. All diodes fine.

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SO, re-cap everything and replace the MV-13 varisters with pairs of 1N4148s.

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Now I can't see my photos.



Gnomes?

Yep, they were there and now they are gone, you can avoid this problem by uploading directly to AK instead of linking them. ;) The first pictures at the beginning of this thread work perfectly, are you doing something different with the latest pictures?
 
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