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SB200 Rotary Switch replacement

Discussion in '"Boat Anchor" & Classic Equipment' started by W1DLA, Nov 17, 2010.

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  1. W1DLA

    W1DLA Ham Member

    Latest in the SB200 rebuild struggle...the rotary switch for the meter is busted, some contacts completely broken off...it shows HV but nothing on other settings and I found a post by N4NAB that seems nearly identical in nature.

    But, I'm having a hard time figuring out a replacement switch...Mouser has a 5contact 2pole switch but it's only rated 0.3 amp and not as heavy duty looking as the wafer switch in the SB200. And, the manual has no real information about the switch needs. Any suggestions for a substitute or will the Mouser 1 105-SR2511F-25NS handle it if it's just meter current?
     
  2. KC8VWM

    KC8VWM Ham Member

    Is it just the solder tabs on the rotary switch for the wiring that are broken off or are the switch contacts entirely disintegrated?

    Is it repairable?
     
  3. W8JI

    W8JI Ham Member

    I have wafers that will work, and are better desiged.
     
  4. W9GB

    W9GB Ham Member

    Doug -

    ElectroSwtich in North Carolina has acquired a majority of the US rotary switch manufacturers
    (e.g. Oak / Grigsby, Stackpole, Shallcross, ASM, Centralab (CRL) and Eaton) over the past 15 years.
    Many of these manufacturers were in the Chicago area and industrial Midwest (hence Heathkit parts source)
    http://www.electro-nc.com/

    These switches have been used a lagre number of US manufactured
    electrical appliances and equipment.

    Electroswitch
    2010 Yonkers Road
    Raleigh, NC 27604
    US & Canada Toll Free Phone: 888-768-2797
    or 919-833-0707

    ===
    w9gb
     
  5. W1DLA

    W1DLA Ham Member

    SB200 Rotary Switch

    Thanks, I'll check the site. Appreciate the help.

    Someone mentioned a wafer would be better...don't doubt it but would the Mouser 0.3 amp rotary work?

    In response to other postings...it's a couple contacts that are broken off, not the solder tabs. There's been some arcing at the switch setting for grid current (which is broken) or at least spark evidence.

    Synopsis...I get an HV reading that's right but nothing on any other setting (In circumstances where I should, of course)...some have reported similar problems from switch and wiring mistakes in the original meter circuit...I'll trace it all but the switch definitely needs replaced regardless.

    Appreciate all the help folks.
     
  6. W1DLA

    W1DLA Ham Member

    When you say "I have" do you mean you have a place to buy one or that I could buy one from you?
     
  7. KB1JFQ

    KB1JFQ Ham Member

    Hi Doug, I sent you a PM here on QRZ.
     
  8. W1DLA

    W1DLA Ham Member

    Just to end this...I finally found a 5 pole 4 throw ceramic wafer rotary small enough in diameter to fit into the SB200 on ebay...usa made but sold from hong kong (strange world)...adapted one throw for the backside of the meter switch in the SB200 and the other wafer as the regular front side rotary in the SB200, had to do some tedious splicing to the old wiring but got it solved. The lack of standard terminology on ebay and the fact that no one posted diameters led me to buy two unsuitable switches in the process...but, live and learn.
     
  9. W9GB

    W9GB Ham Member

    Attached Files:

  10. W1DLA

    W1DLA Ham Member

    I did...Harbaugh doesn't carry the switch. I did chase one down (china wholesaler), got all the tedious wiring done and it's working great....tnx.
     
  11. W9GB

    W9GB Ham Member

    That's too bad (that you used a Chinese mfg and supplier), when the original US mfg. in North Carolina (ElectroSwitch,
    which acquired the original US switch mfg. - here in Chicago area).

    Hope it works properly and holds up.

    w9gb
     
  12. WB5WSV

    WB5WSV Ham Member

    Rotary Switch Replacement

    I bought three of those supposedly USA made rotary ceramic switches to replace the one in my MFJ-941D. I needed 12 positions and it had only 11 but I decided that was close enough.

    It looked like the contacts were smaller than the original, although the switch overall seemed to be sturdier, being ceramic rather than phenolic. Since it had two poles I hooked up both sets of contacts in parallel.

    And it works fine in the 941D. Probably will outlast the original. Especially now that I have a little more idea of what I am doing tuning up a radio.

    As the old saying goes, "Experience varies directly with equipment ruined."

    At three of the switches for about $10.00 including shipping it was not a bad deal. And now I have two spare switches as well.
     
  13. W1DLA

    W1DLA Ham Member

    Chinese Wholesaler but supposedly "made in usa"...Electroswitch makes the ordering process for one switch way to hard...clearly oriented toward wholesale.
     
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