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MC-2255 needs new P/S capacitors

H

handyguy

Member
Hi,
Upon removing my amp from it's cabinet to replace a burnt out bulb, I discovered one of the main filter caps was leaking (fluid actually on top of cap), and it rattles! when shaking. Amplifier was seemingly working ok otherwise. They test as: 34,000uf/0 esr and 30,000uf/0 esr (Mepco labelled as 38,000uf 60vdc 85c -10%) These are probably the original caps around 45 years old!
So I am in the market to replace the 2 caps, the only ones I can find on Mouser/Digikey with appropriate dimensions and capacity are:
Kemet ALS70A513NF100 51000uf 20% 100V 85C 20000h 105mm $91
Kemet ALS80A433NF100 43000uf 20% 100V 105C 9000h 105mm $96
Chemi-con E36D800HPN473ME92U 47000uf 20% 80V 85C 2000h 92mm $56
Chemi-con E36D750LPN393TE92U 39000uf 20% 75V 85C 2000h 92mm $54

Both are good brand names afaik. I am leaning towards the 51,000uf Kemet's, but is that going to be too much inrush stress on the transformer? Otherwise the 47,000 Chemi-con. I am not an electrical engineer!

Thoughts?
 
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I have had good luck using Chemi-Con caps as replacements in 2200 and 2205 amps. I would think the last cap on your list (39,000uf/75v) would be perfectly sufficient for your application (assuming the size, stud spacing and stud height are compatible).
 
Turns out the Kemet's studs are oval with a diameter of 13mm, much to wide to fit through the chassis safely.
Stud height on the old ones is .25"/6.4mm which only matches the Chemi-Con E36D800HPN473ME92U (HP means High post - .25", the other C-C is an LP or low post, meaning too short.) So I only have the one option. Easy choice after all, with John's important point of checking the studs.
Thanks!
 
handyguy said:
Turns out the Kemet's studs are oval with a diameter of 13mm, much to wide to fit through the chassis safely.
Stud height on the old ones is .25"/6.4mm which only matches the Chemi-Con E36D800HPN473ME92U (HP means High post - .25", the other C-C is an LP or low post, meaning too short.) So I only have the one option. Easy choice after all, with John's important point of checking the studs.
Thanks!
Click to expand...
Glad I could help. It's a pain in the butt returning the wrong part.
 
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