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Kenwood KA-801 - issues and outputs?

Discussion in 'Kenwood-Trio/Kensonic-Accuphase' started by slimecity, Nov 24, 2018.

  1. slimecity

    slimecity Super Member

    Messages:
    3,073
    Location:
    New Zealand
    Hi there -

    I may consider bidding on one of these that is available - cited as non working on one channel.

    I see it has the batwing outputs 2SA1107 & 2SC2587 on each channel.

    In case these are blown - are there any modern workarounds to replace these?

    I see that this is cited as being a "high speed" amp - the 2SA1107 has a transition freq of 50mHz and the 2SC2587 of 35mHz - has anyone heard this amp and think it sounds OK?

    cheers!
     

     

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  2. rjsalvi

    rjsalvi Well-Known Member

    Messages:
    581
    Location:
    San Diego, CA
  3. slimecity

    slimecity Super Member

    Messages:
    3,073
    Location:
    New Zealand
    Cheers rjsalvi -

    So no one has experience with, or has otherwise heard this amp?

    Its otherwise known as the KA-8011, apparently.
     
  4. gort69

    gort69 AK Subscriber Subscriber

    Messages:
    1,118
    Location:
    Vancouver, WA
    No experience with that amp, but it's likely very good being one step below the KA-907 in that series. Dual transformers is always nice.

    When I see "one channel dead" I also see "one channel working", which means that it probably comes out of protection, which reduces the chance of shorted outputs. User error or dirty switches become more likely.

    The biggest turn off to me on an 801 is the lack of pre-outs on an amp that high in the line. Not crazy about the styling and the almost always broken toggle switches. They're kinda scarce also. The 8011 is the gunmetal version of the 801.
     
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  5. rjsalvi

    rjsalvi Well-Known Member

    Messages:
    581
    Location:
    San Diego, CA
    (chuckling) Well, we have, but "one channel out" is the same as "my car isn't running right." :) Could be any number of things. ...and as I'm typing this, Gort about covered it.
     
  6. slimecity

    slimecity Super Member

    Messages:
    3,073
    Location:
    New Zealand
    Yea, very good point there gort.
     

     

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  7. THD

    THD New Member

    Messages:
    26
    I just sold a KA-801 last week, demonstrated it to the guy, he took it home & hooked up 2 sets of 8 ohm speakers, turned it on & blew 2 of the 4 ea. 5 amp fuses. He replaced fuses with no speakers connected & blew the fuses again, he obviously hooked something up wrong or shorted speaker wires with power on. OMFG! Now I have to look at it & give his money back or fix it. Who knows where to get a substitute for the 2sa1107 & 2sc2587?? I have the 8011 also but not giving that to him, wondering if theses amps only like an 8 ohm connection rather than 4 ohm.
     
    Last edited: Nov 29, 2018
  8. THD

    THD New Member

    Messages:
    26
    Yes these are good amps if you get a working one, otherwise good luck with finding the power transistors. With luck maybe it's not the transistors, but more than likely it is in my experience.
     
    Last edited: Nov 26, 2018
    slimecity likes this.
  9. THD

    THD New Member

    Messages:
    26
  10. slimecity

    slimecity Super Member

    Messages:
    3,073
    Location:
    New Zealand
    Cheers THD - check out post #2 above for what appears to be good subs. Bdent is a good supplier
     
  11. Broesel02

    Broesel02 New Member

    Messages:
    45
    Location:
    Siegburg, Germany
    use tis ones: Sanken, 2SC2921 / 2SA1215. But only real ones, no fake! They work fine. Replace the trimmer for the Bias, ther are often broken down in this Amp and than the bias will come to high and the amp blows down

    Richard
     
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  12. THD

    THD New Member

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  13. rjsalvi

    rjsalvi Well-Known Member

    Messages:
    581
    Location:
    San Diego, CA
    As Richard mentioned above, there are 150W versions available @ bdent: 2sa1215/2sc2921, but they're about the same price and I'm all about headroom. Could be worse...it could be a KA-9100 with bad output transistors.
     
    slimecity and gort69 like this.
  14. THD

    THD New Member

    Messages:
    26
    Bias trimmer seems fine.
     

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