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AU-4400 Coupling Capacitor recommendations.

Discussion in 'Exclusively Sansui' started by RR--, Jul 7, 2018.

  1. RR--

    RR-- Active Member

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    Location:
    Melbourne, Australia
    Hey everyone, I'm currently ordering parts to recap my trusty silver faced Sansui AU-4400.

    There doesn't seem to be a lot of info out there for this little amp so I thought I'd make a start.
    I already have most of the parts as I try and fill up my shopping cart to qualify for free shipping as well as spares from previous recaps.
    So far I have most as Nichicon Gold Tune, Panasonic FC or Wima film caps.

    I'll also be replacing the two 2SA726W transistors with KSA992FBU (BCE to ECB, transistor flipped) and the Bias trim pots with Bourns 1Kohms 10% 0.5Watts Square 3386P-1-102LF Trimmer Resistors.
    I read somewhere it was recommended to upgrade the large 2200uf 63v filter cap with a 4700uf 63v.

    Question:
    Does anyone have any recommendations on what to replace the two large 1500uf 50v coupling capacitors with? I'm not sure whether a like for like replacement or upgrade is the best way to go.


    Below is a list of the capacitors in the amp in case anyone else needs it.

    AU4400 Cap List

    Driver board

    2200uf 63v
    1500uf 50v
    1500uf 50v
    10uf 50v
    .47uf 50v
    47uf 50v
    100uf 50v
    33uf 50v
    100uf 80v
    47uf 80v
    33uf 50v
    10uf 50v
    .47uf 50v
    47uf 50v
    100uf 50v

    Control board
    3.3uf 50v
    1uf 50v
    33uf 10v
    1.5uf 50v
    10uf 25v
    33uf 10v
    10uf 25v
    1.5uf 50v
    3.3uf 50v
    220uf 50v
    100uf 50v
    100uf 50v
    100uf 50v
    47? 50v assumed 47uf
    47? 50v assumed 47uf
    1uf 50v
    1uf 50v
    10uf 25v
    10uf 25v
    100uf 6.3v
    100uf 6.3v
     

     

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  2. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    If mine, I would use
    C607 4700uf 63v
    C19/20 2200 50V

    Fat and short Snap in caps. what diameter are those caps?
     
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  3. RR--

    RR-- Active Member

    Messages:
    247
    Location:
    Melbourne, Australia
    2200uf 63v is 3.5cm in diameter
    1500uf 50v is 2.5cm in diameter

    Thanks, good to know as I have already purchased a Nichicon Gold 4700uf 63v, it is 2.2cm in diameter.

    No clamps are present as the capacitors have extra mounting pins.

    [​IMG]
    [​IMG] [​IMG]
     
  4. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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  5. RR--

    RR-- Active Member

    Messages:
    247
    Location:
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    The lead spacing on the coupling caps is 1.5cm, 2.4cm for the filter cap, the replacement I bought is only 1cm unfortunately, I didn't think about that before purchasing it.

    It's a lovely little amp, it was my first amplifier, warm sounding but not too warm, very capable at 20wpc although with my modern bookshelf speakers with a recommended rating of 85wpc it does feel like it struggles when going loud compared to my AU-719. Also the level of detail it can resolve isn't at the level of the AU-719. Still it's beautiful and I think I can say it's the highest end silver Sansui integrated stereo amp. (excluding those made in the 90's haha, other than the Au-2200 and a quad amp I can't think of any other silver Sansui's)
    It's funny though because it has aged very well for a stock amp, no background noise, hiss or anything. I think it's due to fact it doesn't have many parts to go out of spec compared to a more complex amplifier.
    It gets used daily with the TV in the living room, never skips a beat either, it's reliability is unmatched so far.
     
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  6. RR--

    RR-- Active Member

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    Location:
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  7. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    those UKA are 1.6cm diameter.

    Any of this ones will do the job and will fit nicely. on C19/20
    (Snap IN)
    https://www.mouser.com/Passive-Comp...Z1z0spjoZ1z0x1j5Z1z0j7l0Z1z0x3qc&Ns=Pricing|0

    (Leaded)
    https://www.mouser.com/Passive-Comp...vqx?P=1z0wqutZ1z0j88sZ1z0spjoZ1yx4avvZ1z0vn3s

    those UKA should be like 7.5mm or so. Is up to you If want them make them fit.
    upload_2018-7-8_1-54-55.png
     
    Last edited: Jul 8, 2018
  8. RR--

    RR-- Active Member

    Messages:
    247
    Location:
    Melbourne, Australia
    Great thanks again in that case I'll go with these instead now. https://au.mouser.com/ProductDetail/Nichicon/LKG1H222MESZAK?qs=sGAEpiMZZMtZ1n0r9vR22d%2blFeYd%2bH4EFZH3DM2JOw0=

    Also a bit unrelated but now I'm in a weird situation where my Mouser shopping cart is just over $60 so really if I can find $25 worth of things to add to my basket I'll qualify for free shipping and actually save some money. Is there anything at all that you recommend I should get? Maybe a transistor tester or something useful? I've added those Zener Diodes that you recommended a while back for my AU-719. I might just need to stock up on solder.
    Edit: Any use in replacing the transistors on F2546 in my 8080?
     
  9. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    mmm
    Maybe replacing Mylars on F2547 0.1uf 50v... you could use C0G.
    On F-2546 you can upgrade ZD01 with 13v zener
    TR01,TR03 with KSC2690
    TR-02 with MJE15032

    Those are I what I used on my 9090 (basket case)
     
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  10. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    You can get some rectifiers diodes too. I use those MUR240 and MUR1620CTG and MUR1620CTRG
     
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  11. RR--

    RR-- Active Member

    Messages:
    247
    Location:
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    Thanks again, I'll order a few TDK C0G MLCC 0.10uF 50V caps for F2547 as well as the two on F2436, there seems to be a lot more green mylar capacitors in the amplifier though.

    F2546
    TR02 with MJE15032 https://au.mouser.com/ProductDetail...=sGAEpiMZZMshyDBzk1/Wi/PUgtclNldlIbxeXkBE6a0=
    TR01,TR03 with KSC2690 https://au.mouser.com/ProductDetail...=sGAEpiMZZMshyDBzk1/Wi8oN7VHZ91OkPdp4Tc8ksXs=

    F2547
    C08, C09, C10, C11 with C0G 0.10uF 50V https://au.mouser.com/ProductDetail...=sGAEpiMZZMvsSlwiRhF8qoDtp3zKP6bToUg2EuviJqw=
    (I checked and the 5mm lead spacing equivalent is out of stock)

    MUR240 https://au.mouser.com/ProductDetail...ha2pyFadugylB5qYkkjlTYgkWdSa4exJ1d%2b9TqBGZI=
    MUR1620CTG https://au.mouser.com/ProductDetail...=/ha2pyFadug89kmNSc3SXsbHSGbxuBecuzYuGvc2LOk=
    MUR1620CTRG (Can't seem to find any on Mouser)


    Any specific recommendations for ZD01 on F-2546? I'm seeing a lot of results and am not sure which is the best option.
     

     

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  12. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Last edited: Jul 8, 2018
  13. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    Hi John, I was referring to ZD01, F-2546, 8080
    Anyway, or you can get some KSC1845.ksa992.... those things are always handy
     
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  14. Hyperion

    Hyperion Roobarb & Custard Subscriber

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  15. RR--

    RR-- Active Member

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    Thanks for that and sorry I derailed my own thread. I'll place the order now and probably have it done by the weekend.

    I bought a 200 pack of 1845's last time so I think I'll be passing them down to my grandchildren one day haha.
     
  16. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    :rflmao:
     

     

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  17. skippy124

    skippy124 AK Subscriber Subscriber

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    RR--, Hyperion and pete_mac like this.
  18. RR--

    RR-- Active Member

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    Thanks John that would have been a good option but unfortunately I already put through the order so I'll see how they go.
    Also I think there is a glitch on the site because it says one cap is $10,277.12 haha.
     

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