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Old 6th February 2009, 02:12 AM   #1
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I JUST found out that I can get free dead-amps from work!! I mentioned that I can never have enough caps lying around. And the boss said "heck you can take any dead amps we have, just here."

I got a Yamaha 7.1... I forget which model, but it's the one that was replaced by the RXV1800. That's in my trunk, I have a ten year old Sony 5.1 on the bench ready to go right now.

Now here's my Q, what's worth keeping? I don't have tonnes of space so I'd like to weed out the rubbish.

Right away I noticed two largish Key-Lime coloured caps rated 10000uF/73v. They are marked "SONY, Audio Use". Anyone know if these are any good?

I'll post a pic of the guts tomorrow, hopefully there's some other graverobbers that can lend advice?
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Old 6th February 2009, 02:39 AM   #2
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Hi,

Quote:
...largish Key-Lime coloured caps rated 10000uF/73v. They are marked "SONY, Audio Use".
Well, when I still sold on fleabay a couple years back, those went fast and anywhere from 8 to 15 bids each. Yeah, might be worth something. Never had one blow up myself.


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I don't have tonnes of space so I'd like to weed out the rubbish.
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Old 6th February 2009, 03:15 AM   #3
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" ... Now here's my Q, what's worth keeping? ..."

The eye of the beholder Q&A ... What to keep depends on how deeply you are into repair. Your boss probably didn't want to spend money & time repairing the stuff ... so, Do You?

Alternate is to eBay the stuff that is complete (no missing modules, knobs, etc.) === >>> "used, complete but broken, repairable, many good parts ... "
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Old 6th February 2009, 05:24 AM   #4
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As a Stereo DIYer, will the transformers from AV amps be of much value to me? I can't figure out the secondary values.. but a cursory test with a DMM would unlock that mystery.

Can I expect useful values??
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Old 6th February 2009, 07:31 PM   #5
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Hello raypalmer, I would suspect that if you are planning on building any power amps, then the transformers from multichannel receivers will be useful. You can figure the approximate VA of the transformer by looking on the back of the receiver at the total wattage draw. Then measure the voltage outputs of the secondaries. I would leave some leaway between the rated wattage draw of the receiver and what you try to get from a DIY unit. This for safety and to allow some headroom. The other part that comes into play is E=I*R and P=I*V. These formulas don't lie!

Peace,

Dave
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