1. Time for some upgrades in server hardware and software to enhance security and take AK to the next level. Please contribute what you can to sales@audiokarma.org at PayPal.com - Thanks from the AK Team
    Dismiss Notice

Dual 1210 issue

Discussion in 'Turntables' started by Bill44, Nov 10, 2018 at 7:17 PM.

  1. Bill44

    Bill44 New Member

    Messages:
    7
    Hi AK,

    My Noresco NC-341 (Dual 1210 on top) just started burning and I cannot see what burnt, is this a common problem and if so, how can I fix it?
    Thank you,
    Bill
     

     

    Please register to disable this ad.

  2. tnsilver

    tnsilver AK Subscriber Subscriber

    Messages:
    3,150
    Location:
    Boston
    No Bill, consumer electronics burning is not a common problem. Assuming the 'cannot see' is not a condition, unplug it, open it up and follow hints of scorched components and scent of smoking parts. Post pix of suspect damage.
     
  3. NoTransistors

    NoTransistors Dual Turntables Super-Restorer Subscriber

    Messages:
    5,197
    Location:
    Brooklyn
    Noresco must have been the Canadian subsidiary of Lucas.

    [Only a select few will understand this reference.]
     
  4. tnsilver

    tnsilver AK Subscriber Subscriber

    Messages:
    3,150
    Location:
    Boston
    maybe this guy will, but there's no Lucas in his memoirs...
     
  5. NoTransistors

    NoTransistors Dual Turntables Super-Restorer Subscriber

    Messages:
    5,197
    Location:
    Brooklyn
  6. olddude55

    olddude55 AK Subscriber Subscriber

    Messages:
    428
    Joe Lucas, the prince of darkness. Although nearly ever AMT model kit I built back in the 1960s had Lucas lamps as a "custom" option.
     

     

    Please register to disable this ad.

  7. stereofisher

    stereofisher For the Love of the Music Subscriber

    Messages:
    4,207
    Location:
    Southeast NY
    Without looking underneath...switch? Not normal.
     
  8. Bill44

    Bill44 New Member

    Messages:
    7
    I figured it was not a common problem, I think I may have found something wrong, but I am not sure, here is a picture of it.

    Also, anyone know a good and effective way of getting rid of the smell? I've had my window open for several hours and the smell is still here.

    https://drive.google.com/open?id=0BwszvhktYO0Ydktfa1NoWEdTOEhiOHdMUUNBMGI3ZWFOOWtR[​IMG]

    Here's the link, sorry about not realizing that it didn't work earlier.
     
    Last edited: Nov 11, 2018 at 5:25 PM
  9. Patrice B

    Patrice B AK Subscriber Subscriber

    Messages:
    2,230
    Location:
    Montréal, Canada
    Contact Klaus (DualCan) on VinylEngine. He's a former assistant manager at Noresco.

    BTW, your pic doesn't show...
     
    Last edited: Nov 11, 2018 at 5:18 PM
  10. tnsilver

    tnsilver AK Subscriber Subscriber

    Messages:
    3,150
    Location:
    Boston
    I can see it - but I'm not really oriented. It's too zoomed in. I need a better perspective.
     
  11. Bill44

    Bill44 New Member

    Messages:
    7
    Will do, give my a minute
     

     

    Please register to disable this ad.

  12. Bill44

    Bill44 New Member

    Messages:
    7
  13. tnsilver

    tnsilver AK Subscriber Subscriber

    Messages:
    3,150
    Location:
    Boston
    OK look, as far as I can tell, this is not a turntable issue but rather a driver amp PCB / power supply malfunction:

    Basically, this PCB with ancient components and rotten power lines:

    [​IMG]

    Fried resistors and medieval electrolytic capacitors:

    [​IMG]

    ...and cooked (bias?) transistors, and suspiciously scorched sections:

    [​IMG]

    Honestly, the entire PCB could use a rebuild, the ouput transistors need checking (prolly some are toast) and the power lines verified and replaced.
    It sounds like a major PITA and unless you have the skill to do it on your own, I'm not convinced it's financially viable or even worth it. Good news is,
    most likely, the nice turntable is probably intact and can be removed to it's own plinth and connected to it's own power supply. Many here would be
    able to assist if you separate the turntable from the amp carcass and re-designate the thread toward a stand alone TT.
     
  14. Bill44

    Bill44 New Member

    Messages:
    7
    I looked back at the areas that you have marked and determined that I am bad at taking these types of photos, I say this because the circle in the first picture is just a marking on the wire, as with the second photo, the top square is just a shadow which is the same for the circle in the third photo, the square marker is a reflection. Knowing this, is it still worth it to repair? (Also, I thought that the blue capacitor in photo #2 looked broken or busted or something). Thank you very much for analyzing these photos for me.

     
  15. Patrice B

    Patrice B AK Subscriber Subscriber

    Messages:
    2,230
    Location:
    Montréal, Canada
    Like tnsilver said, major PITA to restore and not worth the effort in my opinion. Just remove the TT and use it with another amp/receiver...
     
  16. tnsilver

    tnsilver AK Subscriber Subscriber

    Messages:
    3,150
    Location:
    Boston
    You're probably right Bill, it's hard to tell by pics and I did not do a thorough image analysis but it's clear the main PCB is shot with obvious fried components. Anyway, that power cord should be regarded a fire hazard (look under the knot). The large film capacitors with the striped marking all across them haven't been around since the late 60's. The electronics i've seen is ancient and most of it doesn't age well (to say the least) even without it being zapped. Frankly, I'm surprised something like this didn't happen sooner - and we haven't seen the power transformer yet. Sadly, a complete rebuild doesn't come cheap b/c it's a lot of manual labor and it applies for high-end and run of the mill units just the same. This isn't high-end so this unit's preservation should be judicially considered by whoever is going to pay for it. I simply do not think it's worth it. The TT can and should be salvaged though IMO.
     

     

    Please register to disable this ad.

  17. Bill44

    Bill44 New Member

    Messages:
    7
    Given that the whole stereo part is an expensive repair job, I think I’ll either sell it on Kijiji, or run the turntable through my stereo, how hard would it be to separate the TT from the stereo?

     
  18. Patrice B

    Patrice B AK Subscriber Subscriber

    Messages:
    2,230
    Location:
    Montréal, Canada
    Pics of the underneath, the top and complete view or contact Klaus as he probably have the manual... Probably a couple of screws like on the usual Dual changers.
     
  19. Nat

    Nat AK Subscriber Subscriber

    Messages:
    12,769
    It's easy to remove. Loosen the two transit screws, tilt them inward, and lift up. You'll have to unplug the power cord, RCAs, and ground wire to get it out completely.
    You might want to save the cutout board the table rested on (or alternately, remove the amp electronics and use the case) since you'll need it, or a replacement, to mount the table in anything else.
     
  20. jlovda

    jlovda Things I loved from the 60's and 70's Subscriber

    Messages:
    3,464
    Location:
    NE Ohio
    As in Austin-Healey, MG, Triumph and Jaguar electrical parts
     
    Last edited: Nov 13, 2018 at 7:26 PM

Share This Page