Help Saving 400-CX SA-100 and 100-R Tuner

Discussion in 'Fisher' started by moondogtn, Oct 10, 2017.

  1. dcgillespie

    dcgillespie Fisher SA-100 Clone Subscriber

    Messages:
    9,042
    Location:
    Ball Ground, GA
    The heater dropping resistor is in fact the one you have identified: 12Ω, 7W rating.

    I would suggest that once you get the power supplies recapped and the bridge rectifier changed out, then you should be able to go ahead and power it up using the aftermarket transformer setup (assuming all connections are sound and correct), and then we can see what adjustments might be needed from there.

    Dave
     
  2. moondogtn

    moondogtn AK Subscriber Subscriber

    Messages:
    371
    Location:
    Pleasanton, TX
    Finally...school's out! I am hopeful I can work over this some during Christmas break. I ended up ordering custom can caps from Hayseedhamfest. I removed one of the caps and installed the new phenolic wafer this evening. I was able to borrow a rivet gun to make the install nice and neat. I will post pics soon. I am hoping for some advice regarding the removal and installation of the caps. Its a beast to undo the old wiring. Should i just snip as close to old component as possible? This is first ever tube gear I have worked on....it's a little different that board mounted components. Looking forward to this project immensely. Thanks for any and all tips and guidance.

    Bill
     
  3. moondogtn

    moondogtn AK Subscriber Subscriber

    Messages:
    371
    Location:
    Pleasanton, TX
    I finally got the new can caps installed. They look nice but chassis showing it’s age. Is there any safe way to clean it up and make it look better? I have heard many suggestions but I did not want to ruin lettering.

    Also, quick question on the bridge rectifier, will this part be more suited for the task....https://www.mouser.com/productdetail/583-br34

    I would like to place order ASAP but wanted to see if I should include anything else at this time?

    Thank you.

    Bill
     

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  4. audmod01

    audmod01 AK Subscriber Subscriber

    Messages:
    1,031
    Location:
    Tioga, TX
    I am wondering if it might be possible to add a copper strap to the Triad transformer to help control hum when you get to that point. You might find the width needed at: https://www.mcmaster.com/#copper/=1b0tgg8 which would require careful evaluation of just how thick a strap you could use according to the end bells of the transformer. If you can find a correct Fisher transformer, that would be the best solution.

    Joe
     
  5. notdigital

    notdigital AK Subscriber Subscriber

    Messages:
    2,143
    Location:
    NYNY
    That rectifier is a 3A/400V rectifier and is perfectly fine.

    Can you do me a favor: Can you post a pic of the serial # of your unit? I'm working on a CX2 as well and I'm missing the S-number. It looks like it was inked on in yours which would explain why I can't see the # on mine. Thanks!
     
  6. moondogtn

    moondogtn AK Subscriber Subscriber

    Messages:
    371
    Location:
    Pleasanton, TX
    Audiodon, I have looked for an original replacement transformer but so far have not had any luck.

    Notdogital, I thought I posted it in the google photos album but here are a few pics of serial number. I remember reading your thread just the other day. Very cool!

    Order placed earlier today so should be here soon.

    Bill
     

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  7. notdigital

    notdigital AK Subscriber Subscriber

    Messages:
    2,143
    Location:
    NYNY
    Thanks Moon! That number looks like it was ink stamped. In all likelihood, that is why the number on my unit didn't last. Oh well.
     
  8. moondogtn

    moondogtn AK Subscriber Subscriber

    Messages:
    371
    Location:
    Pleasanton, TX
    Progress is slow but installed the bridge rectifier last night. Removed the original terminal strip and mounted to the side How does this look? I still need to clean up the flux.
    I plan on leaving transformers off the chassis for testing. I hope to test tonight if I get in on time but I do need to confirm wiring.
    This is the circuit that had the 120 plug going directly to the diodes. It looks like the black wire got warm/hot at some point? Maybe when someone plugged that cord in? I attached a pic but can get a better pic if needed.

    I am still trying to find a single transformer that will suffice.

    Thanks
    Bill
     

    Attached Files:

  9. dcgillespie

    dcgillespie Fisher SA-100 Clone Subscriber

    Messages:
    9,042
    Location:
    Ball Ground, GA
    That wire surely did get extremely hot! What does it connect between?

    Dave
     
  10. Sam Cogley

    Sam Cogley Last of the Time Lords Subscriber

    Messages:
    30,772
    Location:
    SW Missouri
    I've looked for a 400C transformer for a while. Having Heyboer build one is probably the only way to go.
     
  11. moondogtn

    moondogtn AK Subscriber Subscriber

    Messages:
    371
    Location:
    Pleasanton, TX
    Dave, I need to trace that wire out and will post up findings.

    Sam, or anyone else, regarding the transformer, do you happen to know specs for the orginal on this unit? There wasn't one included so.....for the meantime, I am going to just mount them externally on a plate or board so I don't have to modify chassis. I will still be able to perform work on the unit which wont be fast as I am doing it in spare time. Also, any idea on cost from Heyboer? I am going to start a thread here directly related to power transformer and see if I get any feedback.
    Thanks

    Bill
     
  12. larryderouin

    larryderouin You can be sure if it's Westinghouse??????? Subscriber

    Messages:
    20,459
    Location:
    Glen Burnie Md.
    Bill. If you have or get a Sam's Photofact for the unit, it should have detailed info on it forthe different sections (voltage and amps). Heyboer should b able to wind a new tranny from this along with the physical dimensions of the base holes. Probably in the neighborhood of $150.00 - $200.00
     

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