sansui 8000 blowing lights

Discussion in 'Exclusively Sansui' started by maclvrbr, Nov 10, 2017.

  1. maclvrbr

    maclvrbr AK Subscriber Subscriber

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    recently acquired and it needed all 4 dial- meter lights. Looked great after a week 1 went out. I replaced that one a week later 3 of them went out. Any ideas? 6volt 250 ma.
     
    Last edited: Nov 10, 2017
  2. Robisme

    Robisme Sansui Enthusiast Subscriber

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    Supposed to be 8 volt 300ma lamps. 6 volt lamps wont last.

    Rob
     
  3. maclvrbr

    maclvrbr AK Subscriber Subscriber

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    My mistake I rechecked my stash and they are 8v 300ma I used to replace with. I checked the SM and it suggest the original was 8v, ideas and thanks
     
  4. w1jim

    w1jim I can fix it but good... Subscriber

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    Measure the actual voltage at the lamps.
     
  5. maclvrbr

    maclvrbr AK Subscriber Subscriber

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    will do and thanks
     
  6. maclvrbr

    maclvrbr AK Subscriber Subscriber

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    I am getting 9.5 ac volts at the 2.5 amp fuse feeding the lamps
     
  7. LBPete

    LBPete Rolling Along Subscriber

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    Is this a G-8000? If so, the lamp voltage feed should be 7.5v AC, 9.5V AC is a bit troubling. Where are you located? Is the input voltage selector set correctly? Do you have unusually high line voltage in your house?

    Please post the serial number for the database. Click on the link in my signature block.

    - Pete
     
  8. Robisme

    Robisme Sansui Enthusiast Subscriber

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    What Pete said.

    If all that is fine, you may have to go to 12 volt lamps, if you can find some.

    Rob
     
  9. LBPete

    LBPete Rolling Along Subscriber

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    NO, don't just go to higher voltage lamps! If that transformer output is high, it's likely all of them are high. If my first suggestions don't turn anything up, you need to check all the transformer output. The dial lamp bulbs may be the canary in the coal mine.

    - Pete
     
  10. maclvrbr

    maclvrbr AK Subscriber Subscriber

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    The input selector is correct. at 120v and does have the option for 220v. I do not have an unusually high voltage in my area. Central alabama. Ideas? thanks
     
  11. LBPete

    LBPete Rolling Along Subscriber

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    You need to check the voltage of all of the transformer taps. Measure the AC voltage at all of the fuses on the power supply board F-2807. You need to determine if just the lamp supply is high or are other transformer output voltages high. This is a G-8000 right?

    - Pete
     
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  12. maclvrbr

    maclvrbr AK Subscriber Subscriber

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    It is a G801 I thought it was the same receiver. It does have a multi voltage selector and confirmed it to be in 120v. Will do on the voltage check
     
  13. Robisme

    Robisme Sansui Enthusiast Subscriber

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    The dial lamp power comes directly from a secondary winding of the transformer. If the input voltage is correct, there is not much you can do.

    Follow Pete's advise though.

    Rob
     
  14. w1jim

    w1jim I can fix it but good... Subscriber

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  15. maclvrbr

    maclvrbr AK Subscriber Subscriber

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    I checked the fuse voltage as before ACV is 9.5 at F-03, F-02 and F-01 are 55.5 ACV. That voltage is taken with only 1 of the 4 lamps working at this time the other 3 were blown.
     
  16. maclvrbr

    maclvrbr AK Subscriber Subscriber

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    The lamps are round with leads out of 1 end but thanks
     
  17. w1jim

    w1jim I can fix it but good... Subscriber

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    Oops, all this talk of fuses somehow I incorrectly thought they were fuse bulbs.
    You could always put in a simple voltage regulator or voltage divider to drop the bulb voltage.
     
  18. maclvrbr

    maclvrbr AK Subscriber Subscriber

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    How can I do that very interesting
     
  19. w1jim

    w1jim I can fix it but good... Subscriber

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  20. maclvrbr

    maclvrbr AK Subscriber Subscriber

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    Dwojo said his long lasting 8v lamps work up to 14 acv. Thanks
     

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