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Upgrading an oldie stereo amp? - Page 2

post #11 of 20
Thread Starter 
Wow, thanks for the post!

The big caps are.

Nippon Chemi-con
50v
10000uF
Negative Black
85C
    
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post #12 of 20
Thread Starter 
Any recomendations?
    
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post #13 of 20
Quote:
Originally Posted by Chosen View Post
How would I go about checking that? The only thing I know burnt out is one of the lamps on the right VU meter.
The enamal will be frazzled,
     
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post #14 of 20
Thread Starter 
Quote:
Originally Posted by frostbite View Post
The enamal will be frazzled,
Nope, all of them look fine to me.
    
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post #15 of 20
Quote:
Originally Posted by Chosen View Post
The big caps are.

Nippon Chemi-con
50v
10000uF
Negative Black
85C
Panasonic seem to be a good choice for this application,
I dont have a lot of time, (kicking out at work )
try looking this part no. up ECO-S1HP123DA
or Digikey pn. P6941-ND

They are 12000uF 50V, see if you can get a list of the range from 10000uF upwards, check the physical sizes match and you shold have a good start!
See ya tomorra!!
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post #16 of 20
replacing the caps and even the resisters would be a good idea, but as far as upgrading the rest it's not really going to be worth it.

Panisonic FM caps are pretty good for power

any caps in the audio path go with Nichicon, Blackgate, or auricaps
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post #17 of 20
Thread Starter 
Quote:
Originally Posted by soloz2 View Post
replacing the caps and even the resisters would be a good idea, but as far as upgrading the rest it's not really going to be worth it.

Panisonic FM caps are pretty good for power

any caps in the audio path go with Nichicon, Blackgate, or auricaps
Ok, would getting a power cap with a higher or lower uF rating do any good?
Also what about replaceing the OP power amps?
    
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post #18 of 20
Quote:
Originally Posted by Chosen View Post
Ok, would getting a power cap with a higher or lower uF rating do any good?
Also what about replaceing the OP power amps?

You never want to go lower specs for a cap. You can go higher within reason of capacitance, but never ever go lower on voltage. higher on voltage is just a waste of money.

Do you mean the op-amps? You will have to take it apart and see what it uses for an output stage. If it does use op-amps (probably not) then you can find a comparable op-amp to replace it with
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post #19 of 20
Thread Starter 
Oh, I think they are called power transistors or somthing. There are 4 of them.

look like this
<O>
    
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post #20 of 20
Yup, they the power transistors, in `T03` package by the sounds of things!
I wouldnt go changing them just yet, get some new PSU capacitors, they are quite cheap, $6-7 I think
Hopefully that should make quite an improvement to the sound as it stands, more solid BASS and a clearer MID range too

Changing the transistors could cause problems with BIASing (Them pots!)
They can sometimes be a real bugger to find exact replacements!
The part no. of them should be on the top or round the side if there isnt one you are a bit stuffed!
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Raven
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