Vintage Toshiba SA7150 restoration

Repair of a Toshiba SA7150 2 channel 150 watt per channel vintage receiver.

[@tough213]

Pieces like this are what I called the best audio in the world any vintage gear be it turntables maps recievers 8 track decks reel ro reels cassette decks the best is gear with weight and all metal and wood cabinets I really am glad to know that you are on KZbin along with other guys keeping this great gear alive thank you and be safe from the storm and the virus

[@12voltvids]

You're absolutely 100% correct. The vintage gear was built like a brick shithouse. Look after it and it will last your lifetime and your kids lifetime and probably their kids. I have in my collection several radios that are 100 years old or close to it all still functional.

[@skyler3428]

That’s a nice piece! Even through KZbin through my phone I can tell that thing has some real dynamic sound. Also keep up the good work! Love your videos. I am learning a lot. I really wish I had KZbin and this channel when I was a kid back in the early 90’s I was really into electronics like this and fixing stuff

[@MichaelDuFresne]

I have this units older brother, the SA-7100. Thanks fot eh video!

[@bennychill7228]

I had seen and heard the sx biggest many of them had lot more problems,I currently have this sa 7150 and one before,they are super reliable no restoration required,works everytime.it look like a welding machine,huge

[@brig.4398]

I have an old Hitachi Oscilloscopes, it's also very well made, comes from Japan. One is around 40 years old and works great.

[@DrCassette]

This is an amazing piece of equipment. My vintage Marantz 2265B is nothing compared to this one!

[@mwidealsigns1691]

I have a Toshiba to sale same one

[@dwgwnr1969]

@@mwidealsigns1691 really..message me please

[@mwidealsigns1691]

@@dwgwnr1969 Hi, my phone number is 754.242.1923

[@anitawahyupebriantika4573]

@@mwidealsigns1691 aaa

[@douro20]

A friend of mine had an old JVC Dolby Pro-Logic receiver which had a wonderful sounding Super Class-A output stage for the front left and right channels. It used Toshiba darlington audio transistors which, if I remember right, were driven at around 300 volts. He only used it as a stereo receiver and nothing else. One day a power surge damaged the receiver causing it not to play any audio anymore, and I traced the problem back to a couple of fusible resistors in the preamp stage, which sadly are unobtanium...

[@mustangfreedom]

Just found this in the garbage on a tv stand in the alley. I'm pretty excited considering I also have a Concept 16.5 from when I graduated a long time ago. And I found some SpeakerLabs from Washington that are worth about 300 bucks for free at a garage sale. Madness....

[@12voltvids]

It's amazing what people toss out. I pick up small CRT TVs as the gaming community loves them for retro games. They all sell.

[@murnelbabineaux4743]

Damn !! That thing is huge !!!!!!!!!!!! Toshiba makes great semiconductors !

[@honghaithcsbjnfhbvncj2586]

Murnel Babineaux bnn

[@bobgauthier2779]

What do you think of the SA 7100. There is One close by for sale for $300. one of the turntable Channel does not work The rest of it looks to be in very good shape.

[@nikolaos9906]

I have not seen anything like this in Germany yet A dream device

[@ACCOUNTANTB]

Its hude ! like those old Sansui...lovelly receivers !

[@danmackintosh6325]

Mmmmm 150W/ch. RMS :D One of the "Muscle cars" of stereo! Looks gorgeous too, inside and out.

[@nikolaos9906]

BRAVO Perfect the Contact spray

[@infinitecanadian]

In my days I have taken many an electronic device apart, yet I cannot *ever* remember seeing capacitors that big, and probably would be able to count how many I must have seen before on the fingers of one hand.

[@kwapedog]

man you got skillz. your knowledge...I must have it!haha

[@jameslucas6589]

McIntosh commands even much more. I have 2 MC2105 amplifiers that command over $1500 a pice when they have new glass. New glass is still available. They are strictly 100watt amps no preamps or tuners. They were originally made in the mid 1960s. The build quality is point to point and they are bullet proof as good equipment from that era. I drive them with a MC 220 preamp.Though they are stereo amps, I run them as mono blocks. As you said, pure 100 Watts. Very very low high frequency distortion. Good bands and good recorded music sound amazing. Badly recorded bands and music sound dreadful. It does not hide mistakes. Great video.

[@andred1951]

Thanks for the tip about the circuit glue in another video. I just saved a portable Grundig shortwave radio. Scraped it off and bingo

[@GadgetUK164]

Great stuff! Amazingly complex internals in a lot of these old system. I can see why people want these old amplifiers though - they give a richer sound etc, same reason people like tubes as well. When you first took the lid off their I said 'OMG @ the size of that central capacitor', then I realised it was a transformer lol. The actual caps are still pretty large - what rating in uF or F are they?

[@12voltvids]

No they are still uF. The voltage is quite high on these units, and it is a split supply, as it is a class B amplifier. So each side is probably 60 or so volts.

[@gregrivera8520]

hey bro. if you have a receiver that puts out 135 w per channel on a 2 channel unit what would be the right speakers to hook up to it? on wattage that is.

[@kgu9870]

Have you ever adjusted the power meters on this unit? Mine are pegged at 12 o'clock and not moving. Meters need bulbs as well but i think that's a separate issue.

[@12voltvids]

My Iwatsu 40MHz that is on my bench I bought in 1984 the year I entered the consumer repair business after leaving the Sony corp where I had worked as a betamax tech for a year. When I worked for Sony they supplied all the tools, when I went to an independent shop I had to supply all my own tools and test equipment. I have another older HP scope in my garage that is full of vacuum tubes, and yes it still works great too.

[@bernardzertuche7376]

In addition , when I was looking at the product bulletin for the Teac V909RX, they indicated that 2-each power supply capacitors have a SM for tolerance , 1000mfd,25vdc,sm 2200mfd,25vdc,am All the other are 20%. What is SM and should or do they need to be replaced along with the others on the power supply board Thanks Bernard

[@bernardzertuche7376]

Just had a quick question about the receiver . My receiver is the exact same as the one you are servicing . I notice when I’ve been running my receiver for a few hours , the right side of the receiver is a bit warmer than the left side . It sounds great , but I was wondering if this is something happening in the unit , or is it normal ? If it’s not , what kind of test should I run to determine probable cause ? Thank in advance , Bernard

[@Popart-xh2fd]

I prefer nowadays stuff to old one, because microcontrollers used today result in less wiring messing around and thus the build is more clean and simple.

[@bernardzertuche7376]

I purchased online a recap restoration kit for my SA775, but the filter capacitors in the kit were not applicable for my SA775, They were the right specs, except for the solder lugs. The replacement caps were snap in caps instead of solder lugs . The original caps have at least 7 wires soldered on one of its solder points . With snap in caps , it’s really not very applicable to use in place of originals, plus the replacement caps were half the size of originals (Nippon Chemicon) What’s your take on this issue . Thanks

[@bernardzertuche7376]

Thanks for the info I’ll keep look for replacement filter capacitors with higher capacitance and voltage I saw some 22,000 mfd @100vdc (Nichicon). Just hope they will fit in the enclosure.

[@bernardzertuche7376]

Good morning, I was working on a Teac V909RX cassette player. I’m recapping power supply unit . I was looking at schematic diagram to see how many and what values of caps to purchase. Some of the caps have a triangle with an exclamation mark bu the cap on the diagram ..what does that mean ? The book doesn’t really give any references other that placement and values Thanks Bernard

[@jackoliva5740]

well done.

[@bernardzertuche7376]

Good evening I have a question regarding this receiver, I recently purchased 4 each vintage Advent Loudspeakers. 8 ohms each cabinet. On some channels audio techs configure stacking 2-each of the 8 ohm advents in parallel making both units a 4 ohm load to the right channel and the same for the left channel . In an earlier segment you mentioned it’s not wise to put such a low load on these vintage receivers because it could cause problems . Is it best to run each 8 ohm cabinet to its own individual speaker output on the SA7150 (A-speakers Left and Right, B-speakers Left and Right ) instead of only using A-speakers Left and Right at a 4 ohm load with 2-each 8 ohm speakers in parallel?

[@12voltvids]

What does it say on the back? If it says 8 ohm minimum then running it into a 4 ohms load is asking for trouble.

[@jackoliva2390]

woow,awesome.

[@SanAntonioNews78]

Isn't it good that the back half of that is a metal case to help with releasing all that heat? I agree the wood looks so much better but I bet that unit put out some HEAT

[@Dillisive]

WOW LOOK AT THOSE COMPACTORS

[@stevencraig]

7 bills for the 9090. Lol. I just checked eBay for recently sold ones, and they're ~ $1500 CAD and up. I hope you kept yours.

[@bernardzertuche7376]

Good morning I have a capacitor question regarding the SA 7150 and SA775. The SA 7150 had originally 4-each 15000mfd@80vdc And SA775 has 2-each 15000mfd@63vdc. I’m trying to find replacement filter capacitors but having the worst luck due to availability. How high in MFD and voltage can I go on the 7150 and 775 without comprising my unit ? Secondly , do you happen to know what my VDC rail voltage and ripple current is on the 7150 and 775? Thanks again for all your guidance . Note : looking to use screw caps on SA775 instead of solder lugs … Thanks again Bernard

[@12voltvids]

You can always go higher in capacity and voltage. Won't hurt anything. The operating voltage is set by the transformer. Bigger uF means more reserve.

[@davidtillwach5542]

The vintage receivers will pop modern 🔊 speakers in flash . I had a set of jamo running off a sansui 771 and a couple times almost blew the 🔊 speakers

[@12voltvids]

Any amp will pop speakers if you drive it into clipping.

[@davidtillwach5542]

@@12voltvids Yes but the power from the vintage stuff is way more rated than today's stuff . My Onkyo Tx-nr676 is no way as powerful and some of the lower wattage sansui stuff. But the vintage stuff is mostly two channel stereo .unless your talking quadphonic ,then it's four channel sound . Some newer receivers are 9.2

[@SanAntonioNews78]

I know in the 70s there was a power war in terms of watts with receivers and everyone trying to out perform each other. But did you really need 150w per channel? My dad had a Pionner sx 880 with 60 wpc and that thing was loud!!

[@12voltvids]

There is a difference between loudness and headroom. Headroom means that the amplifier has sufficent reserve power so it will never clip. If all you listen to is highly compressed rock or rap then everything is going to sound the same. Throw on some jazz or classical with real dynamics and then let's talk about reserve power.

[@larryshaver3568]

that looks very advanced in styling for 1974

[@craiglarge5925]

1979.

[@bernardzertuche7376]

Very nice unit . I enjoy watching your skills repairing these units . I recently purchased the 7150. I wanted to replace the filter capacitors due ti their age . They are 15000 mfd, 85 degs C, 63 VDC. Any suggestions on the replacements I was thinking , 15000 mfd, 80 VDC, 105 degs C, 2000 hours life , screw lug.

[@12voltvids]

Those will work. You can always go up in voltage. No need for 105 as they are just 60hz filters but it won't hurt. 105 are needed for switching power supply. Again won't hurt except your wallet.

[@bernardzertuche7376]

Thanks for quick reply . I’m no audio technician, but learning slowly as I move along the vintage trail . If these are large filter capacitors (15000mfd) for power supply , do they need to be audio grade or can a general purpose filter capacitor , like Nichicon , Rubycon suffice ? Also , is ESR rating important to these capacitors ? Thanks again for all the helpful tips , Bernard

[@12voltvids]

@@bernardzertuche7376 Audio grade is not so important for main filters. I know audiophools will digress but they aren't called audiophools for nothing.

[@bernardzertuche7376]

Agreed !!! Thanks for keeping us informed when it comes to vintage equipment . I sent a small donation for your technical expertise in helping me out I’ll probably reach out to in the future if I come across issues with 7150. Regards Bernard

[@12voltvids]

@@bernardzertuche7376 thanks kindly

[@kgu9870]

Does anyone know if this is a common ground amp? I'd like to use with polk sda speakers which require common ground amp.

[@12voltvids]

I believe all the grounds are connected together.

[@maddoxinc1642]

Yeah but, is it a brute?

[@williamstaten8102]

I'm one of those crazy guys that pays big money for some of these old receivers. Payed 500 for a mint in OEM box sta2080, and 300 for a brand new in box sta2280 and many others. Some have dropped in value because ebay got flooded with these things. Once people seen what others are willing to pay for this old stuff.

[@12voltvids]

Old gear is valuable to many collectors. You should see what I pay for broken antique radios that need full restorations. I have an old Macontosh mac1500 and a sansui 9090db in my collection. The 9090 is worth a small fortune. If it wasn't so bloody heavy I would drag it down to the bench to service as it needs service. All the controls and switches need looking at.

[@bernardzertuche7376]

Greeting I also have the Toshiba SA775 receiver . Wanting to also change out filter capacitors due to age . 2-each wired in series with each other to DC rectifier. They are 15000 mfd, 63VDC, 85 deg C just like the SA7150. I know these units are used to filter ripple voltage and current making power more smoother and straight . You stated I could go up in capacitance and or voltage . I’ll probably stay at same capacitance , but move the voltage to 80 VDC . The caps are close to large transformer. With that said can I stay at 85degs C spec as designed or should I move to 105degs C I think my frequency across the DC is 120hz , on the AC side before it hits the transformer is 60 hz. I’m limited to space as well . Higher temp caps are generally larger . But I think I can get by with 50 mm x 100 mm The Nichicon general purpose cap is 50 mm x 100 , 15000 mfd, 80VDC, 2000 hrs life , 6.4 ripple @120 hz. Screw terminal, ESR 17.6 Mohms. My rail voltage on the receiver is 54 Volts at the transformer , I’m sure after it goes through the two caps it’s much higher . Do you think the caps I’ve listed will be a good fit for the SA775? They cost roughly 41 US dollars . Thanks Bernard

[@12voltvids]

Yes 85' are fine.

[@bernardzertuche7376]

Thanks again for your counsel

[@ElectoneGuy]

9090 is up over $1k now. A buddy of mine just picked up a mint one from Goodwill for next to nothing...

[@12voltvids]

+Audioquest56 I know. Crazy what people will pay. I wonder what my MacIntosh 1600 is worth.

[@ronniepirtlejr2606]

Can he bring the Beast back to life?

[@markanderson350]

Toshiba launched launched this high name called Aurex

[@cmj20002]

In 2017 there is one for sale for $750 US, so these are pricey.

[@ElectoneGuy]

How do you like Nutrol compared to Deoxit D5?

[@12voltvids]

+Audioquest56 have never used Deoxit, only Nutrol. The old Nutrol is superior to the new stuff. I found an old can at work in the garbage and fished it out. Old stock (almost a full can) from back in the 70's. Back then it has the old skull and crossbones on the can, so you know it will be good stuff. The new stuff is alcohol based like all the cleaners, with a little bit of oil. It is food equipment safe now. Not the old stuff, no way.

[@Ramdileo_sys]

mmmhhhhh wood grain... @LGR will approve... :-DD

[@donald1056]

Lot of wires in this system!!

[@fickfehler3866]

if this was Marantz or Pioneer, the price would be 5x. very under rated receiver

[@12voltvids]

What people ask and what they get are totally different. Like for example my sansui 9090. I wouldn't pay more than 100 bucks for one but i won't let mine go for that. I turned down an offer that started at 500 and went to 1000.

[@fickfehler3866]

@@12voltvids Yes very agreeable. Here in Germany SX1980 will have many competition offers of 10,000 euros. Your talents are very valuable sir.

[@randyfisher6108]

i need same thing done to my 7150 what ya charge

[@12voltvids]

I believe I charged the owner about 80 to repair this beast

[@randyfisher6108]

how can i send it to you

[@12voltvids]

Contact me by email

[@randyfisher6108]

your in canada

[@12voltvids]

yes, vancouver

[@maheensulaiman7184]

It looks similar to Pioneer SX-1250 internal construction

[@IgnacioSanchezWebDesign]

Hi! I want to buy it!

[@12voltvids]

Not mine to sell.

[@Synthematix]

The speakers were good until i plugged them into this amp and turned the volume to 50%

[@12voltvids]

+Synthematix It has enough power to pop speakers all right.

[@Synthematix]

Its a beast, i can remember here in the UK Ferguson made them very similar, they were bloody monsters in a teak cabinet

[@nikolaos9906]

Sometimes the volume control knob is so worn out that a channel is gone

[@nickv4073]

I believe Toshiba sold these units with optional hernia protection insurance.

[@12voltvids]

Sony got shut down by worksafe when they introduced the 40" trinitron tube. just under 400lbs for a TV.

[@davidtillwach5542]

@@12voltvids I owned one of those Sony 40 inch televisions 12voltsvids your totally right that bugger was so heavy it wansnt funny. I fixed it with replacement chips in the motherboard . Then the blue gun went . Next was the garbage I didn't pay for it anyway got for free off Craigslist

[@12voltvids]

@@davidtillwach5542 I had a Panasonic 34" wide screen tube, and that one was so bloody heavy after I gave it away and it broke I refused to fix it. Kicking myself now because I wish I still had it. Just as a keepsake for my CRT collection.

[@davidtillwach5542]

@@12voltvids those were nice televisions I remember them costing like 1500.00 bucks at Sears .they were HD I bet you could of run 4K off them old sets . But the power they consume is alot .

[@IgnacioSanchezWebDesign]

Is it FOR SALE???

[@12voltvids]

This wasn't mine. Customers.

[@IgnacioSanchezWebDesign]

@@12voltvids Thanks. Have a great day!

[@76chyanne]

I have a Toshiba sa-514 4 ch frt rear out put any demand

[@brig.4398]

One of the things I really liked about the old stuff was the beautiful faceplate. Now I go to the big box store and all they have are those ugly looking stereo equipment, thats why I won't buy one.

[@12voltvids]

I have a Sansui 9090 that is my unit. I have had to turn down many requests to sell it. I will be doing an overhaul on it, and a total restore at a future date. You think this toshiba looks nice wait till you see the Sansui. Like the Toshiba it is 150+ watts per channel, and has an analog tuner, with DolbyFM.

[@thedayones4918]

Beautiful just sold my last yr for $875 and regretting it 😏 anyone have one for sell? lmk. Ty

[@mwidealsigns1691]

I have one to sale $400

[@robertpowell8760]

That is not a restoration

[@12voltvids]

Sure is. Thats the limit the owner put on it. Not everyone changes every capacitor. Actually it's the amateurs and crooks that do. I guess if you are a good salesman you can blow sugar up your customers ass and tell them how wonderful it will sound. That only works with the uneducated. Those that know won't buy in. About 10 years ago a customer brought me an amp to recap and after hearing it he brought it back to have the old caps put back in because he did not like the new sharp as a needle sound. He was used to and performed the sound the original caps provided. I did leave a few in the low voltage regulator circuit (they measured bad esr) but all the coupling caps went back in and he loved the sound. New caps, even the audio grade, have totally different characters than vintage. They might spec the same but due to the chemicals used in the electrolytic they sound different. Subtle but different and someone with a good ear can hear this.

[@Manny2211]

You’re videos are helpful but you’re attitude not so good reminds me of a back yard mechanic how don’t care about the vintage audio community not sure what thinks about this today but I stop watching your videos hope you find your way and think about this lots of people look up to you please change so all of os can enjoy the hobby of vintage audio repair and restoration

[@12voltvids]

I fix plenty of vintage audio, however I do not rip people off like many by changing unnecessary parts. My clients all want things fixed on a budget. They tell me exactly what they want done because in many cases they are going to sell the unit and they obviously don't want to pay me more than they are going to get for the unit. I troubleshoot to the problem and nothing more. Sorry if you don't agree but that is the way I work. This is why I have so many repeat clients because they know that they will get their unit repaired for 60 bucks not 360.

[@dmptcb]

@@12voltvids don’t listen to Antonio he doesn’t know what he is talk about u do amazing work and probably can make more money from the work u do look at auto mechanics here in the states they make 100 dollars hour so don’t listen to that jerk and keep up your great work I love your videos

[@12voltvids]

@@dmptcb I don't listen to the trolls that know nothing. No there is not really any money in this field anymore. I think I made about 30.00 on this. Nobody wants to spend any money on stuff.