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Just finished Sanyo Plus 130 receiver restoration

tarior said:
Nice work. That's a rare bird you've got there. Legend has it that there was actually a Plus 200, but AFAIK, it's vaporware.
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Plus 200 was prototyped. Four were made for assessment but production was not started. I have a crappy picture somewhere. It looks just like the 130.
 
NAD80 said:
Beautiful Receiver. Looks like new. Great work. Found this on it. Rolling stone article, go down to the $1000 section. https://www.rollingstone.com/music/music-news/the-incredible-stereo-hunt-79209/ How much did you replace in it to make it work?
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Thanks for the link. These are the old parts, I always keep and them and bag by board name , I also keep my notes and highlight each component as I replace them. Will be handy if I ever have to work on it again, or the unlikely event that I ever sell something something

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rossm said:
Hi SoCal Sam
Do you still have your Sanyo Plus ? I came across quite a few of your posts when I was researching my Plus 130
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The Plus 200 belonged to a former Sanyo exec. I only saw pictures of it. BTW, my source is impeccable. It exists.
 
Plus 130 update
This receiver is haunted!
Listening to the Sanyo while working on the bench and I didn’t have time to change the cd when it finished. A few min later I hear a faint 120hz buzz from the speakers that only last about 1 sec. About the third time it happened I decided to time it on my iPhone stopwatch and found it the buzz repeats every 26 minutes , you can set your watch by it. So far I know the volume knob doesn’t affect it, it’s coming from both speakers and I am pretty sure it’s not upstream because I use the same CD player on other equipment. Giving the timing I would think it’s related to a capacitor. I didn’t change out the main filter caps. Will be fun tracing this one down.
 
rossm said:
Plus 130 update
This receiver is haunted!
Listening to the Sanyo while working on the bench and I didn’t have time to change the cd when it finished. A few min later I hear a faint 120hz buzz from the speakers that only last about 1 sec. About the third time it happened I decided to time it on my iPhone stopwatch and found it the buzz repeats every 26 minutes , you can set your watch by it. So far I know the volume knob doesn’t affect it, it’s coming from both speakers and I am pretty sure it’s not upstream because I use the same CD player on other equipment. Giving the timing I would think it’s related to a capacitor. I didn’t change out the main filter caps. Will be fun tracing this one down.
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Soooo, didja find out what's goin on.
 
rossm said:
Earlier this year I found a Sanyo Plus 130 receiver at my local ewaste drop off site. Amazing find considering they only made about 1500 of them, that puts its rarity in the same league as Marantz 2500. Very cool with the tuner displaying both digital and analog. LED power meters and unique Freon filled heat sinks. Even with its rough condition I had no choice, this receiver must live again. The first shocker was the dial glass had been busted.
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This receiver had a rough life, power transistors burned, resistors smoked and charred craters in the pcb
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Also pretty dirty inside
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This receiver was not designed with service in mind. The power supplies are located on the same pc board as the amps. To get to the power amp boards the power transistors which are attached to the big heat sinks must be disconnected from the driver board via 8 molex connectors. Then the Receiver has to be upside down to unscrew the main power caps. Once that’s done the amp boards can be flipped 180 degrees and re connect the power transistors and caps for troubleshooting, rinse and repeat to work on the other amp board. The power transistors molex connectors can be attached several different ways that will produce smoke. Even though it looks like the left and right power transistors are interchangeable they aren’t. Care must be taken in case someone else has been inside. I managed to find a very bad copy of the service manual and uploaded it to hifiengine , so I was able to trace out and Map the proper orientation of the molex connectors.
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I managed to replace all electrolytic caps , burned resistors and transistors and get her singing again. I Also replaced the busted glass, was fortunate there was no lettering or holes in the original design.
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Everything works great with the exception of AM radio, the rear antenna was missing. Never Listen to AM any longer so no big deal. FM works great!
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In the rack now connected to a set of KEF 104.2’s which are constant 4 ohm load. Sounds good and hardly breaking a sweat.
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Makes the mighty STA-2100D look small!
I also have a Sanyo Plus 75 I would like to restore but unfortunately it uses the unobtainable transistor power packs, so working on discrete transistor replacement.
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The KEF loudspeakers are not a receiver job to drive, unless yours can handle 2.7 ohms (Sanyo's not built for that). Reality.
 
KentTeffeteller said:
The KEF loudspeakers are not a receiver job to drive, unless yours can handle 2.7 ohms (Sanyo's not built for that). Reality.
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I ran a Harman/Kardon 430 into a nominal 2.67 ohms for years, rode it hard and put it away wet, and it never failed. Of course, it didn't have enough power to hurt itself. :D It also apparently had a very, very low output impedance.
 
No,
That was 5 “forever” systems ago. But the current one is holding out for maybe 6 months now. Guess I need to update my pic
 
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