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Toshiba SA-750

Ash5561

Ash5561

New Member
Hello, everyone.

I recently found a Toshiba SA-750 for sale, and, having never really seen a Toshiba receiver, I was quite taken by it, and found it amusing that it appears Toshiba looked at the Pioneer SX-750 and went "yeah, that'll do, but can we put the volume control where Technics puts it?" and then proceeded to make this, and the thought of that playing out goes through my mind every time I look at it. Not to make fun of Toshiba for doing that, the Pioneer receivers are very nice looking, so it makes sense they would want to make it look like one.

Anyway, It was too good of a deal to pass up, and looked to be in very nice shape, none of the dials where missing, or the switch caps, nor was anything bent. However I didn't have a way to test it, but I'm sure a lot of you on here know this feeling, I just couldn't leave it there. So I bought it.

Predictably It wouldn't be so easy as to take it home, plug it in and have it work perfectly. I plugged it in turned the power switch and was greeted with the sound of something arching, and after narrowing it down to the power switch, I managed to get it out of there, and that was indeed what it was, the contacts look pretty cooked. I have read this is a common problem with many receivers of this era, but I am very new to electronics repair, and now that the switch is apart and on the workbench, I am not really sure how to proceed, any help with this would be much appreciated.

Thank you everyone for taking the time to read this.
 
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Hello,

Thank you very much for the welcome! I have attached the pictures I took of the switch, I got a bit, carried away I think in taking it apart. I managed to wrangle the whole assembly out of the receiver without actually undoing the tuner string.
 

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Start looking for a parts unit several of the SA models appear to use the same speaker select/on/off switch.
 
Thank you. I was hoping there might of been another way to deal with it, But yeah. I've been looking, the SA-725 appears to be the closest match, Shipping is just absolute murder on these things. Hence my hope that there was possibly another solution. But again, thank you very much for your help!
 
Its hard to tell from the pictures, but did this switch have 2, or 4 contacts? I have seen versions of this switch w 4 contacts, where you can bridge the 4 contacts into 2 and correct the problem. If it had only 2 connections (contacts), then best to follow avionics suggestion.
 
You may want to hunt on the auction site from time to time, and also look for Kenwood Speaker/power switches as well. Kenwood used to use these type and other compatable piggyback power switches
 
The Switch appears to only have 2 contacts. Not sure if it helps but the switch is made by Alps. Yeah I have some searches saved for similar switches. I guess for now I'll put the receiver back together and put it to the side for now. Thank you Avionics and Tom for all your help!
 
You can in the meantime jump across the 2 switch contacts, and use a small power strip with an on/off switch until you locate a replacement.
 
Thank you. How would I make the speaker selection work? Would I just reassemble the switch without the part containing the contacts? I know it wasn't producing sound before I took the switch apart, and Looking it appears the fuses that protect the speaker section (At least that is what it appears they are for, I can't think of another reason to have two identical fuses, right next to each other, right in the area the amplification stuff is) were blown (Well I know the fuses are blown, I'm just not 100% sure what they do, the service manual doesn't specify) So I ordered some fuses and they are on their way.
 
Update, I've jumped the switch. (Well, pretty much removed all trace of it) And it works! Well it at least turns on, the replacement fuses have not arrived yet, but should be here in the next few days, and then I can finally see how it sounds and if everything else is working. I've uploaded a picture of how I jumped the switch, In the event that someone else has the same problem and needs a picture. I've also included a picture of the receiver itself, as they seem to be uncommon enough that many people probably haven't seen one and I thought someone might like to see it.
Thank you very much for all of your help Avionic and Tom!1567044078663.JPEG 1567048284278.JPEG
 
This thread has another alternative that might work for you.

If you're able to clean up the contacts enough that they can carry something less than 150 milliamps, and get the switch back together, this is a non-standard solution that seems to have worked for quite a few people.

(It's worked for me for a couple of years now, on a Sony receiver that had already gone through a couple of switch replacements. Now that they're pretty much NLA, I want the one that's in there to last as long as possible.)
 
Hello. Thank you. I think I'm just going to keep the back part of the switch assembly, that contained the arcing part out of the receiver for the time being. Provided the speaker selection portion of the switch is working correctly, I'll probably use a different method i saw on here and just install one of those inline switches into the power cord, Or I might not even go that far and just keep turning it on and off with a power strip. There really isn't anything in my stereo setup that needs to be on constantly anyway. But thank you very much for sending that thread, I'd not seen that one while trying to troubleshoot the switch.
 
I picked up a Toshiba SA-620 for about the price of a hamburger at the flea market. I did not have much faith in it's performance, but it surprised the heck out of me. I ended up using it in conjunction with my SX-1250 and the Toshiba performed well along with the Pioneer. It made for a great 4 speaker setup. I hope you get yours squared away and enjoy it.
 
I've gotten it up and running now, using some fuses I had laying around (One of my other receivers is a Technics SA-5070 that was an extremely lucky Goodwill find, So it spared its fuses for the time being) They are far from the right value, but they at least allowed me to confirm that nothing else is wrong with it, and use it for about an hour. I am also very pleased with its performance, and am happy to have it in the collection, how long it will remain as my main unit I'm not sure (I'm very fond of my dancing VU meters and blinky lights lol) but If I never bought another receiver or Amplifier, I would be more than happy with this one.
 
Ash5561 said:
Thank you. I was hoping there might of been another way to deal with it, But yeah. I've been looking, the SA-725 appears to be the closest match, Shipping is just absolute murder on these things. Hence my hope that there was possibly another solution. But again, thank you very much for your help!
Click to expand...

Thought I would mention that the Sa-750‘s closest match is actually the Sa-735. A 35W near-identical-clone to the Sa-750 (at least under the hood/ parts layout/ face-plate). Also, they both sport discrete electronics in the power amp stage, whereas I am fairly confident the Sa-725 does not.
I am aware that my post is 4years (wtf!?!?) too late for OP’s purposes, but I wanted to correct this assertion for the sakes of posterity, accuracy and future Toshiba enthusiasts.
Photo of 735 on bottom, 750 on top, included.image.jpg

That is all. Chuck
 
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