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BA-F1 restore

Discussion in 'Exclusively Sansui' started by Hyperion, Dec 1, 2017.

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  1. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Digikey. ;)
     
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  2. Overundr1

    Overundr1 AK Subscriber Subscriber

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    Amazing :bowdown:
    Thinking this would work for the 919 as well.
    What detail.
     
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  3. ghamilton

    ghamilton Super Member

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    I know it's not new. It just seems to be explained and done in such a way to be practical for most people. Maybe someone that wouldn't consider this before, will now.
     
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  4. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Ah ok - understood :thumbsup:
     
  5. Overundr1

    Overundr1 AK Subscriber Subscriber

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    Will also be interesting to see how those outputs perform and if you will need to add any small value caps to the feedback circuit to prevent overshoot during square wave testing later on.

    :lurk:
     
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  6. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Yep, I did some signal generator testing of the set of original OP transistors before I removed them, I have a good idea of the square wave output at various frequencies. All was nicely damped, nice and square with no overshoot - I took the trouble as I thought this would be important to know. :)
     
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  7. smurfer77

    smurfer77 AK Subscriber Subscriber

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    Got to agree with that; the detailed instructions make this much more approachable for many of us.
     
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  8. Karl vd Berg

    Karl vd Berg Super Member

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    Yes, and the approach reaches other models/brands, too, including KA-907's 2SA165 / 2SC2489 (50MHz), L-07MII's 2SC2337/2SA1007 (70MHz), etc...
     
  9. pete_mac

    pete_mac Super Member

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    Thanks for your efforts in documenting and explaining the process John!!
     
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  10. _mano

    _mano Active Member

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    Great thanks
     
  11. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Well, bench testing complete, listening to it now for the first time, being driven by my C-2102 pre-amp (- fully reconditioned) - it's beautiful, plenty of bass with a very nicely presented image. Female vocals are very nice, and rock music makes you feel like turning it up!

    Just a soak test and final set up to do - then cosmetics such as speaker terminals, remove and clean the front panel etc.
     
    Last edited: Jan 16, 2018
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  12. ManyMoonsAudio

    ManyMoonsAudio AKA paul79 Sponsor Subscriber

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    Nice. Look forward to your extended eval and your results regarding the bench testing.
     
    Last edited: Jan 16, 2018
  13. smurfer77

    smurfer77 AK Subscriber Subscriber

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    Great thread! I've been following all the way along. Can you comment on sound and build of BA-F1 vs AU-X1/11 ?
     
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  14. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Yes, the BA-F1 is similar to the AU-X1 - but less refined although it does extract a fair amount of detail. The rock music presentation of the BA-F1 reminds me a bit of the AU-717. I should think the BA-F1 would sound significantly different depending on what pre-amp it is paired with.

    But I may just be telling you what my C-2102 sounds like paired with the BA-F1. :confused:

    I could do with trying some more rock music, and some classical. :music:
     
    Last edited: Jan 17, 2018
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  15. smurfer77

    smurfer77 AK Subscriber Subscriber

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    I guess the ultimate comparison would be to have the BA-F1 paired with the CA-F1.
     
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  16. tarior

    tarior Dirty pool, old man? Subscriber

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    And here I was all impressed with the new Toshiba TTA/C004 devices with 17 and 12 pf Cob.

    Nice work on the BA-F1, btw.
     
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  17. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    I installed the replacement speaker terminals over the past weekend, what a job. Who could have guessed that Sansui used a round hole in the outer rear panel but used a square hole in the stiffener plate behind the rear panel. This meant some filing was required to the square holes (8 of them) in the stiffener plates to ensure that the through panel insulators for the terminals seated correctly and did their job.

    I also changed the mains lead for a 3 core round cable, in favour of the figure of 8 (2 core) original cable. (earth in the new cable left disconnected).

    I got the meters and their illumination cleaned and set up, and managed to view the peak lights working without blowing up my puny 8 ohm loads. :D

    So there you have it, I am listening to it now with covers off, I will post some final pictures when its modesty is restored. :D
     
    Last edited: Jan 22, 2018
  18. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Pictures

    IMG_2325a.jpg

    Rear showing new speaker terminals.
    IMG_2326a.jpg

    The speaker terminals look ok ;)
     
    Last edited: Jan 22, 2018
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  19. tarior

    tarior Dirty pool, old man? Subscriber

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    Those terminals actually look right. Most of the time modern terminals look really out of place on a vintage piece. Very good.
     
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  20. ghamilton

    ghamilton Super Member

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