View Full Version : Sansui 7900Z


macaltec
04-16-2006, 06:42 PM
Picked one of these up this weekend. Not too shabby for the money invested. Everything works and it cleaned up to around an 8 out of 10. Not the prettiest Sansui but not the ugliest either. Can't find much info on it though. After 1980 the info damn near stops in all of the sites I know about.

Duffinator
04-16-2006, 07:31 PM
That's a nice looking receiver. Unfortunalely I know nothing about it but how does it sound?

It's been Sansui receiver week on my local craigslist. There's a G-8700DB for $300, a QR-6500 for $75, and a G-8000 that I purchased yesterday.

macaltec
04-16-2006, 07:33 PM
That's a nice looking receiver. Unfortunalely I know nothing about it but how does it sound?

Better than some, worse than others.

BroonsBane
04-16-2006, 08:02 PM
I have one of these, just sold it actually but it's still in the house. It's a nice receiver, sounds decent. I liked the bottom end it has but not a keeper for me.

OMI
04-16-2006, 08:07 PM
http://www.audiokarma.org/forums/showthread.php?t=13012

http://www.audioasylum.com/forums/vintage/messages/64728.html

100 watter...

rocdad
04-16-2006, 08:18 PM
I too just picked one of these up. It is begining to grow on me. Mine works like new, but seems like there is much to go wrong. I will keep mine though. I think it has a similar sound to the G*700 line. It just crosses the line for the purists. The led tuner dial lacks something.

macaltec
04-16-2006, 08:40 PM
I too just picked one of these up. It is begining to grow on me. Mine works like new, but seems like there is much to go wrong. I will keep mine though. I think it has a similar sound to the G*700 line. It just crosses the line for the purists. The led tuner dial lacks something.

The tuning Dial is what I hate most about it. I'm not fond of the tuning arrangement on my 7700 either. The pushbutton volume and tuning is quite unimpressive as well.

BrandXRC
04-16-2006, 11:33 PM
I had a 9900Z and it was a pretty good sounding unit. Real similar to the G-7700 I used to have. But was probably produced as the build quality was decreasing. The difference between the insides of the 9900Z and say a G-9000 were quite different. http://audiokarma.org/forums/showthread.php?t=56267&highlight=9900z By the way I do have a service manual for the 7900Z-8900ZDB-9900Z on disk if you need some info.

Robisme
04-16-2006, 11:58 PM
OK, I have to add my 2 cents, again. I had a 7900Z as my my main unit. It did not fit in the entertainment center so the wife said lose it. I dropped $500 on a new Marantz (or who ever makes it) receiver and it was weak. I returned it as it could not compete with the Sansui. Even she agreed. For an 80's unit it holds it's own. It almost blew the Quadraflexs and it rocks the Polks.
It was retired and the AU-719 fits the bill. And the entertainment center.

Rob

Robisme
04-17-2006, 12:05 AM
The difference between the insides of the 9900Z and say a G-9000 were quite different.

I believe the 9900Z was liquid cooled. Hence the smaller seeming heat sink.
They used the liquid cooling in some upper end amps also. While I agree the build quality was down on the 9900Z, it was also electronically evolved.
Hey, it was the 80's.

Rob

rocdad
04-17-2006, 09:32 AM
BrandXRC, I could use some info on DC off-set and bias adjustment (how to check on Bias as well) on the 7900Z. Macaltec gets first attention though, since it's his thread.

You can PM any info.

Many thanks,
Dan

macaltec
04-17-2006, 10:10 AM
BrandXRC, I could use some info on DC off-set and bias adjustment (how to check on Bias as well) on the 7900Z. Macaltec gets first attention though, since it's his thread.

You can PM any info.

Many thanks,
Dan

I need no attention. Just glad to get some discussion going. I'll learn along with everyone else. I'm curious for the same info as well. Post away.

macaltec
04-17-2006, 12:00 PM
I listened to this receiver most of last night and A/B'ed it with the G7700. I'm kinda wondering why the 7700 would cost me so much more than the 7900 if I were to have to buy them from ebay. There really is no discernav\ble difference in the sound to me. Now the 7700 is much better looking but still not as nice as the G-x000 series. It's a keeper for me.

BrandXRC
04-17-2006, 08:59 PM
BrandXRC, I could use some info on DC off-set and bias adjustment (how to check on Bias as well) on the 7900Z. Macaltec gets first attention though, since it's his thread.

Many thanks,
Dan

I could not find any info on offset in the manual. Only AM and FM frequency adjustments and Bias adjustment. Following is the bias info. Also I dont mind sharing the entire manual with fellow AKers. I just dont know how to send it as it is aprox 67 mb, and I believe AOL will only let me send 16 mb. So if you know how to do it just let me know...
http://i48.photobucket.com/albums/f217/BrandXRC/SAVE0028.jpg
http://i48.photobucket.com/albums/f217/BrandXRC/2953d770.jpg
http://i48.photobucket.com/albums/f217/BrandXRC/c4f08cf9.jpg

Robisme
04-17-2006, 10:22 PM
Fyi

TEK475A
04-17-2006, 10:23 PM
Macaltec:

Just curious: on the back of your particular 7900Z, (by the speaker terminals), is the speaker impedance rating giving for 8 ohms or 4 ohms?

I point this out, because some models in that line had both. Its interesting that you were comparing the 7900Z to the G-7700. Very interesting indeed.

The eternal question that many Sansui fans would like to know is... how come the G-7700 doesnt have a specific 4 ohm rating in the back, yet the 7900Z does, or to add even more fuel to the fire so to speak, how could an even smaller, lower-powered 4900Z be rated for 4 ohms, but supposedly not a bigger beast like the G-7700? Is it a conspiracy? :scratch2: Anyone-a-here care to provide a plausible answer? :D


http://cgi.ebay.com/CLASSIC-SANSUI-4900Z-AM-FM-STEREO-RECEIVER_W0QQitemZ9713051428QQcategoryZ50592QQssPa geNameZWDVWQQrdZ1QQcmdZViewItem#ebayphotohosting

BrandXRC
04-17-2006, 10:44 PM
Macaltec:

Just curious: on the back of your particular 7900Z, (by the speaker terminals), is the speaker impedance rating giving for 8 ohms or 4 ohms?

I point this out, because some models in that line had both. Its interesting that you were comparing the 7900Z to the G-7700. Very interesting indeed.

The eternal question that many Sansui fans would like to know is... how come the G-7700 doesnt have a specific 4 ohm rating in the back, yet the 7900Z does, or to add even more fuel to the fire so to speak, how could an even smaller, lower-powered 4900Z be rated for 4 ohms, but supposedly not a bigger beast like the G-7700? Is it a conspiracy? :scratch2: Anyone-a-here care to provide a plausible answer? :D


http://cgi.ebay.com/CLASSIC-SANSUI-4900Z-AM-FM-STEREO-RECEIVER_W0QQitemZ9713051428QQcategoryZ50592QQssPa geNameZWDVWQQrdZ1QQcmdZViewItem#ebayphotohosting
On the back of my 9900Z it said
A, B, C, 8-16 ohms
A+B, A+C, B+C, 16 ohms
http://i48.photobucket.com/albums/f217/BrandXRC/Picture008.jpg

Robisme
04-18-2006, 12:52 AM
Back of my 7900Z states A or B 4 ohms. I had a 5900Z that was A or B 8 ohms. I have seen both receivers both ways. The one thing I wonder about mine is the voltage sticker on back says 220 but its crossed out and 120 written over it. Don't know if that made a difference. I have run 2 sets of 8 ohm speakers at the same time and never had a problem.
It remains a mystery.

Rob

TEK475A
04-18-2006, 01:07 AM
Sounds like someone who had owned the receiver before you had simply crossed out the 220V on the label, because its obviously not something that Sansui did.

Well, perhaps the Sansui moderator can offer some enlightenment to us on this issue of why various, identical models have either 8 ohms or 4 ohm ratings. (And why a 4900Z, for example, can supposedly handle lower impedance speakers better than a much larger, higher wattage G-7700 can) :scratch2:

Morden2004
04-18-2006, 07:48 AM
Sounds like someone who had owned the receiver before you had simply crossed out the 220V on the label, because its obviously not something that Sansui did.

Well, perhaps the Sansui moderator can offer some enlightenment to us on this issue of why various, identical models have either 8 ohms or 4 ohm ratings. (And why a 4900Z, for example, can supposedly handle lower impedance speakers better than a much larger, higher wattage G-7700 can) :scratch2:

I wish I had the difinitive answer but .... the manufacturing anomolies of the old Sansui company are lost to the ages.

My guess (and it's only that) is that most of the Sansui outputs would handle 4 ohms but some units with protection circuits would trip protection when you approached 4 ohms and so they simply played it safe and labeled the backs '8 ohms'.

What would be very interesting to analyze is which manufacturing lines each of the differently labeled units are from. So, those of you with an 8 ohm only unit post your serial number here, and someone with an identical unit but labeled 4 ohms post your serial number as well. I'm betting they came from different factories. :scratch2:

Paul

Robisme
04-19-2006, 12:32 AM
What would be very interesting to analyze is which manufacturing lines each of the differently labeled units are from. So, those of you with an 8 ohm only unit post your serial number here, and someone with an identical unit but labeled 4 ohms post your serial number as well. I'm betting they came from different factories. :scratch2:
Paul

Here's mine.

Rob

Morden2004
04-19-2006, 05:34 AM
Thanks, Rob. Anyone with an 8 ohm only unit care to post their serial numbers?

Paul

macaltec
04-19-2006, 04:30 PM
My serial# is: 812060296 and marked A,B 4~16ohm and A+B 8~16ohm.

rocdad
04-19-2006, 10:51 PM
#812030052 same as Macaltec

BrandXRC
04-19-2006, 11:02 PM
Altho I dont own it any longer my 9900Z was an 8 ohm unit #811030421

BrandXRC
04-19-2006, 11:07 PM
Also my old G-7700 #819040160 didnt make any mention of ohm ratings at all on the rear...

Morden2004
04-20-2006, 10:49 AM
So far, the data doesn't seem to suggest any specific change in manufacturing.

Odd.

Paul

TEK475A
04-20-2006, 08:47 PM
Paul 'ol chap:

Might I suggest: 'Tis not the manufacturing lines that will yield the answer. Me-thinks it has to do with the manufacturing date. In other words, I have a hunch that in the approximate 1980-1982 timeframe, the early models were rated at 8 ohms, and then at a latertime, Sansui changed them to 4 ohms. If more folks contribute serial numbers, then a pattern should soon emerge to confirm this. Integrated amps that were made at the same time should also be checked, ex: AU-D7/D5.

(PS: A :thmbsp: to Sten for being the one to originally reveal the serial # 'code').

farr out
02-25-2007, 01:20 AM
My 7900z, serial number 810120004, says a or b: 8 to 16 ohm, a + b: 16 ohm. I am currently running a pair of Infinity RSa's (4 ohm) with a pair of advent 3's(8 ohm) and it has been fine. The only problem with mine is that I have to apply a light whack to the top of it when I fire it up to get the dial lights to come on. Other than that, it's a really nice, powerful unit. Surprisingly good tuner, much better than my Pioneer sx-939. I've been going back and forth between the two and I think I prefer the Sansui. Not as good looking, but better sound. Don't like the volume and tuning buttons, oh well.

Scott

superdog
02-25-2007, 01:01 PM
I had a 8900z 125wpc .Lots of power.didn't like the volume control button.I gave it to my bro.If I didn't have others i would have kept it.These were probably the last of the good Sansuis.

birddog
05-07-2007, 01:48 PM
I'm putting my 7900Z up for sale today on my local craigslist, and thought I would add my serial # and Ohm ratings before it goes out the door.... :sadwave: #820081165 :(

Morden2004
05-07-2007, 02:11 PM
Offerig (or suggesting) that your gear is for sale is not allowed in the forums. Use the Classifieds.

Paul

birddog
05-07-2007, 02:55 PM
Sorry Paul, I was not trying to make a sale, merely stating that I was putting up the serial number before I got rid of it. If I have overstepped the line, please delete/edit the post as you see fit, I meant no harm... :thmbsp:

jrsh92
11-01-2007, 06:16 PM
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