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  • Power Switch Needed!!!

  • SteveM

    Member
    December 7, 2021 at 7:47 pm

    I broke the power switch on the amp for my sub. Does anyone know where I can find one to replace it.
     
    * If you could please give me a direct link to the part it would be helpful as I have found a lot of power buttons that are similar but not the exact part number and I and do not know of any of them will work for this amp especially with this strange little jumper thing going on.    
     
    This is a power switch for a Bedini 25×25.

     




  • 123Toid

    Administrator
    December 7, 2021 at 7:59 pm

    I’m not sure if this helpful, but it appears to be a Honeywell switch. You want to get one that’s at least 15 amp. If you get one that’s more, that’s fine. https://sps.honeywell.com/us/en/products/sensing-and-iot/switches-and-controls/toggle-and-rocker-switches/rocker-switches/aml-series

    Power Switch Needed!!!

  • 123Toid

    Administrator
    December 7, 2021 at 8:01 pm

    @stevem

    PS if you click on the where to buy section. It’ll show you the closest place you can bring the switch to in person. That way they can match it up for you.

  • SteveM

    Member
    December 7, 2021 at 8:13 pm

    @123toid There are two places not to far from here that I can check out.  Thanks! You wouldn’t happen to know where my car keys too!  🙂

  • 123Toid

    Administrator
    December 7, 2021 at 8:36 pm

    @stevem haha! Nope 🤣

  • TVOR-Ceasar

    Member
    December 8, 2021 at 4:14 am

    @stevem 

    For your keys:

    The switch looks to be a Single Pole, possibly Double Throw (second pole not used?) with a neon indicator. I doubt that Bedini amp uses anywhere near 15 amps, but the larger contacts at lower amperage would reduce arcing and extend life, if not broken. 😁

    I went to the link provided by Nick, but after 4-5 pages I didn’t see any 30 series switches. Best bet is to contact them and share your post with pics. Direct link is next to the date of the post. 

  • SteveM

    Member
    December 8, 2021 at 5:48 am

    @tvor-ceasar @123toid I did find this https://www.alliedelec.com but I cannot see the posts and this on ebay https://www.ebay.co.uk but not sure if either would work.  Could either of you kindly take a look and tell me what you think?

    Oh I know who took my keys.  He isn’t talking but I can see it in his eyes… 

     He know, he knows…

  • TVOR-Ceasar

    Member
    December 8, 2021 at 1:39 pm

    @stevem 

    The Ebay switch looks to be almost the same switch – the casing, pressure springs and layout seem to be the same. Only differences are that it is a DPST instead of SPST, and a paddle instead of rocker. You could use it, just use only one side of the 4 “like” spades (and save a boatload of money over the Allied Electric listing). And, if this ever happens again, just use the second pair of contacts. Bonus!

  • SteveM

    Member
    December 8, 2021 at 2:24 pm

    @tvor-ceasar Nice! I ordered it, thank you.  I was kind a worried about the price though. All the switches I have looked at were in the $50+, so I wasn’t to sure I found the real thing. I’ll let you know how it turns out.  Now I can put the Bedini back together again so I can test the amp out. That system is a pain but well worth it. The amp has been down for several years. Helping me find the switch was the final part in the rebuild, so thank you. 

  • SteveM

    Member
    December 8, 2021 at 2:49 pm

    @tvor-ceasar Sorry one last question. Would you know why the switch is jumper’ed like it is?

    The middle pad is bridged to the lower pad. The middle pad broke at the solder point and that took out the switch. I’m just wondering why it was done in the first place. I didn’t do it, the amp was custom made back in the 90’s long before I got it. 




     

  • TVOR-Ceasar

    Member
    December 8, 2021 at 3:03 pm

    The switch lights up, right? Those 2 oddball oriented tabs are for the neon lamp in the switch. (Hence the neon designation in the plastic) My assumption is that the switch is on the hot wire of the AC line. The incoming hot goes to the single blade on the other side of the broken one, the broken one goes to the transformer, and the one next to the soldered blade goes back to neutral. That way, when you apply power to the transformer it also applies power to the neon bulb. 

  • SteveM

    Member
    December 8, 2021 at 4:36 pm

    @tvor-ceasar Got it, thanks for all the help, very much appreciated. 

  • TVOR-Ceasar

    Member
    December 9, 2021 at 2:57 pm

    @stevem 👍 

  • SteveM

    Member
    December 14, 2021 at 6:36 am

    @tvor-ceasar @123toid Thank you both! Thanks to your help I was able to find the right power button and with all the other work I did on it the old beast is back up and running once again.  This is the strangest amp I have ever seen. Custom built by Bedini himself as a sub amp with a built in crossover or low pass filter, not sure what you would call it. But thanks to both of you for the help. Long story but getting this amp up and running was the final step in a 20+ year journey to fulfill a dead mans wish. Thank you.  



  • TVOR-Ceasar

    Member
    December 14, 2021 at 1:15 pm

    @stevem Beefy looking unit. Classic minimalist design, and all discrete. The amp section looks to be in really good shape.

    My only concern is the Power Supply board.
    1. There looks to be a missing power resistor near the writing adjacent to #16.
    2. The Power Resistors are getting really hot and burning the board. You may want to scan or take a photo of the board’s foil side in case the heat does something to the traces. That way you can either reproduce the board or use jumper wires to fix it, if it ever comes to that. I have a playlist on my channel on how to etch boards at home with commonly available etchants, and even cold transfer methods.
    3. Should you ever need to replace those resistors (you did write down their values?), raise them up a bit more off the board, if you can, in order to allow more airflow for better heat dissipation.

    Other than that, ROCK OUT! 👍 👍 

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