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These 3 caps are all I can find. I need to source out the 2500mf/60V NP
cap. the other two are 150 and 40mf 50V 10%. Any idea who would have
the 2500?.
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Classicspeakerpages shows in the AR forum that the compulytics have not degraded as other 'lytics would. Going to better caps is probably a good idea but they indicated no need to replace them after doing the testing on them. Just a comment. party on.
Good news, but do you know what type of caps are in those
tan color square shaped units? (4 and 6 mf).
If worse comes worse,make your own 2500np electrolytic by putting a pair of 5000uf in series by tying the negatives together and using the two positives..I still think there is a way to eliminate that part with a mild crossover redesign as my friend did.
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
Do you think that's better than 5/500mf's tied together?. Should I
just measure them and if within spec just leave them, and replace the
smaller caps?.
I would replace the caps with 5 500ufs...
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
As I wrote before I used (2) 1000uf and (1) 500 uf - all Bennic. I can vouch for the Bennics (along with a couple film caps to get closer to spec). It's a bit easier to mount 3 than 5 caps!
Use the cable ties and some hot glue to keep the caps both securely mounted and to reduce vibration.
The sonics are really good. No complaints there at all.
Believe me, I researched that cap replacement VERY thoroughly and this is the best solution I could come up with.
Jim
You won't get any argument from me.You know AR speakers and caps better than anyone I know..I wish I remember the upgrade my friend dave used to mod the circuit to use smaller chaos for those 5000s in series.
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
Hi Mikey!
No argument meant - thanks for sharing your thoughts!
try this
nt
five 500 mf NP's in parallel from Parts Ex. Seems a good option.
They wanted to make sure there were enough micro farads to go around with all those drivers in the LST.\:^)
Doug
Edits: 06/19/12
I bet it's still good.
Doug
It might be time to invest in that capacitor meter.
I keep thinking there must be a better way than putting those things in the signal path.
Dave
Yes I have a meters, I think at least one will go that high. I'm
tempted to leave it if in spec.
Aren't there back panels that unscrew? My LST's have them and the xover board is mounted to the back panel.
2500, 150 and 40uf are correct but there's a tweeter cap in there too, probably 6uf.
Do polish the fuse holder and the metal ends of the fuses if they look blackish.
Good info, just didn't want to take panel off if I didn't have to :)
Will look for the other cap/s.
Check out that large sprague against the sprague catalog. IIRC, the 32D series was a simple computer grade electrolytic but I could be wrong.
Stu
Probably no where. I think Bennic makes a 2400mf NP electrolytic. The AR9 uses the same value cap in the LF crossover. Jim McShane was able to help me out and get togeather and size caps that I used in parallel to get 2500mf. He provided the rest of the crossover caps as well and there are alot!
The caps must be non-polar.To replace the original 2500 uf Callins caps in my AR-9s I used a composite of (2) Bennic 1000 uf caps and a Bennic 500 uf cap. I used a couple smaller caps to "trim" the value to spec since the Bennics of that size are 10% tolerance. Madisound is a good source for Bennics.
I'm sure you can do the same in the LST.
Edits: 06/20/12
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