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Sansui 5000

AM/FM Stereo Tuner Amplifier (1968-69)

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Sansui 5000


The model 5000 is Sansui's most powerful all transistorized tuner amplifier for the stereo enthusiast who demands the very best money can buy.

From the latest FET and IC front end for increased FM sensitivity and selectivity, to the ability to the ability to handle up to three speaker systems and four tape recorders at the same time, the 5000 combines more features preferred by experts than any other receiver in the world.


Tuning range: FM, MW

Power output: 75 watts per channel into 4Ω (stereo)

Frequency response: 15Hz to 30kHz

Total harmonic distortion: 0.8%

Damping factor: 50

Input sensitivity: 2mV (MM), 150mV (DIN), 150mV (line)

Signal to noise ratio: 65dB (MM), 70dB (DIN), 70dB (line)

Output: 200mV (line), 200mV (DIN)

Speaker load impedance: 4Ω (minimum)

Dimensions: 440 x 125 x 350mm

Weight: 13kg

Year: 1968


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re: 5000

In the manual for the Sansui 5000 is the following: Caution: Never attempt to use two or three 8 ohm speaker systems at the same time. For use with three speaker systems, the impedance must be more than 8 ohms each. For use with two speaker systems (A+B or A+C) the combined impedance of the systems must be more than 8 ohms.
I am not understanding exactly what this means. My plan was to connect 2 pairs of Sansui SP-2000 speakers, which are 8 ohm speakers, but based on this warning I don't think I can now do this? Can anyone advise me?

re: 5000

Hi Mikook,

There are two factors at play here. The first is the ability of the receiver to supply an extra amount of current. The second is the fact that speakers that are rated at a particular impedance (8 ohms in your case) are actually a "nominal" impedance. Impedance is the AC equivalent of DC resistance. This is why they are both specified in ohms.

To explain the first one. All electronics must follow Ohm's Law. This is usually specified as Volts = Current x Resistance. If one of the variables change, then it must change the other variables. So if you are driving your speakers with a given Voltage V, but you change the Speaker impedance R, then the Current must also change. So an amp driving an 8 ohm impedance will need double the current to drive an impedance of 4 ohms. Older speakers were generally designed for tube amps and 8 and 16 ohms were the norm. As Solid State took over, the speakers moved to 8 and 4 ohms. So older amplifiers weren't designed to supply the extra current that a 4 ohm load needed.

On to the second. The impedance of a speaker varies depending on the frequency that it is being played at. There are almost always peaks at certain frequencies and dips at others. A typical 8 ohm speaker could have an impedance that varies from 2 ohms to 10 ohms. With one speaker this isn't usually a problem as the music is constantly changing. The problem is compounded when you have two of the exact same speaker connected in parallel. Impedance and Resistance of equal values end up being half of the rated value. So an 8 ohm speaker provides a 4 ohm load to the receiver. Now if there is a sustained musical note that is at the frequency where the impedance drops to 2 ohms, a pair of speakers will provide a 1 ohm load to the receiver. This is essentially a short circuit and will most likely cause damage to the components in the receiver. The formula for determining parallel resistance is (R x R) divided by (R + R).

Sorry for the long winded response. I was trying to provide the reason for the warning.


re: 5000

Thank you for your help Bob,
I guess I will just connect 1 set of speakers for now unless there is some type of device that provides speaker impedance protection.

Thanks again,

re: 5000

Hi Mike,

I never said it wouldn't work. I was just trying to explain why the manufacturer put that in their manual.
If you are not going to be listening at high levels it should be fine. The manufacturer was just trying to cover their butts if a customer brought the receiver in damaged during the warranty period. All manufacturers of the day had similar warnings.

A couple of ways to use the speakers simultaneously.

1- Play at low to moderate levels only. If you have teenagers that operate the system I wouldn't recommend this option.
2. Add something like a 2 to 4 ohm power resistor in series with one or both of the speakers.
3. Use an external sperker switch box that has the resistor built in, like the Adcom GFS-3 or GFS-6.
4. Add an external power amplifier to power the second pair of speakers. You would need one that has adjustable input level and you would connect it to the record out jacks of the receiver.


re: 5000

OK, Many Thanks Bob,
I'm going to give it a try. I will start at low volume, as you suggest. I rarely turn the Marantz above "4" and that is plenty loud. I might check into the Adcom's or something similar. I may want to set something up so that I can switch between the Marantz or Sansui as my source and feed the signal to the same 4 speakers. If I do this I'm sure there is something available with a resistor built in.
Thanks again!

re: 5000

Bob is very knowledgeable about speaker impedance, almost sounds he may have designed or engineered his own speakers. However, you do not have to worry about using your two pair of speakers on the Sansui 5000. Because your speakers are rated at 8 ohms. That warning is VERY important if you were using 4 ohm speakers. Also , why would SANSUI allow you to run two sets of speakers at one time if they anticipated the unit not being able to handle the load.
BTW, I am a former MARANTZ technician.

re: 5000

Thanks Frank, that's very good to hear. I am actually running the 2 pair of SP-2000's with a Marantz 2238b right now with no problem. But also, I know the Sansui was produced 7 or 8 years before the Marantz so I thought the earlier electronics might be cause for concern. Anyway the Sansui 5000 should be here soon (bought on Ebay) and I wanted to get everything set and ready to hook up when it arrives. I downloaded the manual off the Hifiengine website and noticed the warning and was not sure what it meant.

Thanks again for your help!

re: 5000

Thank you so much for Sansui 5000 Schematic. From Thailand.

re: 5000A

Many many thanks for the invaluable service manual
from Strasbourg, France

re: 5000A

Thanks also from Ann Arbor, MI USA

re: 5000A

Many Thanks from Athens, GREECE

re: 5000X

I'm an old guy who has been a hifi devotee since I was a kid. I recently purchased a 5000X that was manufactured in 1970. This was my first exposure to Sansui, having always been a devoted Pioneer fan. When initially powered up, the right channel produced only garbled distortion. On a guess, I replaced all the fuses and was rewarded with the best-sounding receiver I've ever owned. The FM section was very sensitive, and picked up stations that my other receivers could only wish for. The real treat came when I connected a phono. I was astounded - literally. I immediately understood why this receiver is so popular. Bass production is phenominal. This is the first receiver I've ever owned that I ran WITHOUT the loudness compensation. I always run my tone controls flat with loudness contour to boost treble and bass at low volume levels. No need to do that with the 5000X. With the bass and treble controls flat and no loudness compensation, this receiver literally brought my speakers to life. I needed to fund the repair of a nice reel to reel deck, so I sold the 5000X to raise the money. I should not have done that. I've been on the hunt for another one since because I simply cannot get the sound of the 5000X out of my mind. I've also been looking at other Sansui receivers. I hope that the sound characteristics of the 5000X are common to all the other "G" model and earlier Sansuis. I'd like to start a collection if so. Highly recommended. GeeDeeEmm

re: 5000X

hi guy was over seas in 1970 sansui was on my list of to dos the 5000x still lives at my house today with out a doubt its been 45+ years and through out time the 5000x still sings the sweetest my advice is do not settle for less..5000x is the BEST !!!hands down chuck rock city cleveland ohio

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