Sansui AU-555A Rebuild Cap Coupled Goodness
- Thread starter patfont
- Start date
Hey Pat, thanks for the awesome thread and pics! I just completed my 555a following your guide and loving the results!
Only thing I wonder is if you ended up sticking with the 2SC871 flying saucers or replaced them? And if so, what replacements did you end up doin?
Only thing I wonder is if you ended up sticking with the 2SC871 flying saucers or replaced them? And if so, what replacements did you end up doin?
thirelian
New Member
Hi Pat,Got a chance to get a little bit of work done on the 555 last night. Replaced the clamped caps along with 3 resistors and 2 diodes.
The 555 sounds very nice!
Here are some pics:
Old Stuff
Top side look
Bottom
Thanks for this great write up. I've also been enjoying reading about your E-cap shoot out- all very helpful as I'm a bit of a novice, about to embark on restoring a recently purchased 555A. I see the KG @ C003 above, but what did you use for C001,2 & 4? Any chance you still have the parts list for this?
JimL1
Member
I have a Sansui AU-555 I replaced all electrolytic caps. C 001 kind of baffles me. It is a .033 uf oil cap hooked between Plus and MInus of AC. I assume it is a "safety cap" to prevent surges ect. it is white about 2 inches long. should this be replaced or left alone since it is an "oil" cap?
It's probably a 'spark suppression' capacitor put there to quench the spark of the power switch when it is operated. Oil capacitors are dated technology for domestic audio use, and it would be better to replace it with a modern 'X rated' film capacitor (of the correct value), designed for the purpose (i.e. AC voltage rated).
Like this
https://www.mouser.co.uk/ProductDet...=sGAEpiMZZMu3dWSqd4Tl0IS/WU9LZFzaYR55KBgAJx4=
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JimL1
Member
Thanks John that is what I was thinking also. I will replace it with X Rated Safety cap. I see a lot of blue "103" values on many. I wonder why Sansui has such an odd value of .033UF. I wonder if it would matter much if I replaced it with an easier obtainable value of 103 K (.01Uf) Thanks for the reply John
Yes it would matter, if you are intent on changing the value, you would be better going for a (possibly easier for you to find?) 0.047µF capacitor, reducing the value to 0.01µF is not a good idea.
Note when I access the Mouser site - because I am in the UK I get the UK Mouser website instance - Mouser are a US based company, at www.mouser.com based thousands of miles closer to you than to me!
(trying to understand your reluctance to buy the right value component for less than $0.5..... )Try this:-
https://www2.mouser.com/ProductDetail/Panasonic/ECQ-U2A333MLA?qs=/ha2pyFadujzoEy44zbhDYD%2BwNQDMpB9370x%2BKkGOPgJhJJWdE1MGA==
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Leestereo
Super Member
For a couple of 555A and 777A restorations, I used this one from Wurth Elektronik: https://www.mouser.com/ProductDetai...3dWSqd4Tl0CiU2JSfp58GsSHRGmvjaFTKH4wvIgCNgg==
margus_
Member
I have question about 6,3v Elna Silmic II caps.
Is it better to stay by 6,3v or increase their voltage to 16v (as suggested in another topic)?
main amp C815 / C816 - 220 uf / 6,3 v
tone control C705 / C706 - 47uf / 6,3 v
phono C609 / C610 - 100 uf / 6,3 v
In Leestereo`s topic is recommended C815 / C816 upgrade to 470 uf and C705 / C706 to 100 uF to extend their effectiveness to below 20Hz (https://audiokarma.org/forums/index...storation-upgrade-of-a-sansui-au-555a.816754/).
If I want to use Silmics and raise both (capacity and voltage), their diameter will get too big (I guess)...
Is it better to stay by 6,3v or increase their voltage to 16v (as suggested in another topic)?
main amp C815 / C816 - 220 uf / 6,3 v
tone control C705 / C706 - 47uf / 6,3 v
phono C609 / C610 - 100 uf / 6,3 v
In Leestereo`s topic is recommended C815 / C816 upgrade to 470 uf and C705 / C706 to 100 uF to extend their effectiveness to below 20Hz (https://audiokarma.org/forums/index...storation-upgrade-of-a-sansui-au-555a.816754/).
If I want to use Silmics and raise both (capacity and voltage), their diameter will get too big (I guess)...
AnalogueBen
Well-Known Member
We generally give the advice to go up a voltage step, especially the small value like 6.3v. Remember to compare the lead spacing as well as the diameter.
margus_
Member
Yes and no
I like the aesthetics of your work. That`s why I prefer Slimics in these places (I know a little silly reason )I have available this selection:
main amp C815 / C816 - 220 uf / 6,3 v
- Elna Silmic II / 220 uF / recommended 16v / Ø10 / p=5
- Elna Silmic II / upgrade to 470 uF / recommended 16v / Ø12,5 / p=5
- Nichicon FG / upgrade to 470 uF / 1recommended 16v / Ø10 / p=5
- Elna Silmic II / 47 uF / recommended 16v / Ø8 / p=3,5
- Nichicon FG / 47 uF / recommended 16v / Ø6,3 / p=2,5
- Elna Silmic II / upgrade to 100 uF / 6,3v / Ø8 / p=3,5
- Nichicon FG / upgrade to 100 uF / 16v / Ø8 / p=3,5
- Elna Silmic II / 100 uF / 6,3v / Ø8 / p=3,5
- Elna Silmic II / 100 uF / recommended 16v / Ø10 / p=5
- Nichicon FG / 100 uF / recommended 16v / Ø8 / p=3,5
margus_
Member
C815 / C816 - Ø10 mm (Ø12,5 mm will fit too, seems to have same leg space as Ø10 mm caps)
C705 / C706 - Ø6,3 mm (on some photos I have seen Ø8 mm to)
C609 / C610 - Ø8 mm
