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9090db

  1. R

    Sansui 990DB bias / trimpot issue

    Greetings AK friends, Some background for context: I am fully restoring a 990DB. During the process, and testing along the way, replacing the bias/offset trimpots on the driver board caused the DBT to 'pulsate'. I came across a Youtube of this guy who faced the same issue and pointed towards...
  2. R

    Sansui 990DB lights…..

    Greetings AK friends, Long time admirer of AK, first time posting (well, second time as I just posted a question in the Marantz forum). I recently fully restored a 990DB for a client (yes, included the DB board), but for the life of me can’t figure out why suddenly I have no “juice” to the...
  3. C

    Sansui 9090DB Output Problems

    Been through this 9090DB, just finished pinning and recapping the dolby board that was previously preventing sound from passing through the pre in either channel. After the pinning all modes seem to work except for one channel in rec 2 that I plan on addressing later - but importantly - off -...
  4. D

    Sansui 9090DB Poppy Buzzy Bass

    Hello! I have been playing my rebuilt 9090DB for about a month now. Yesterday I finally was able to turn it up to see how she sounds on a higher volume. I did a full recap, replaced fusible resistors on the driver board, replaced some diodes, rebuilt the bridge rectifier, fixed the through...
    • degdug
    • Thread
    • 9090db bass driver board help pop pop noise on power up repair advice
    • Replies: 5
    • Forum: Exclusively Sansui
  5. D

    Sansui 9090DB FM issues

    Hey all, I just finished a recap of the 9090DB, fixing of the Dolby board, and LED upgrade. All was well until yesterday when FM radio started jumping around. It was working fine for hours previously. The issue is only present on FM radio. I've tried with antenna and without. No change...
  6. D

    F-2656 Resistor match

    I need to confirm resistor values for: R30 R31 R32 (The light blue fusible resistors in the photo) I believe they are all 1 ohm 10% per the manual. But I'm getting 1G ohm 10% on the color bands. Can anybody confirm these values?
  7. M

    Weak outputs transistors Sansui 9090db

    I have been fixing A sansui 9090db for a while now,driver board ,power supply are done unit is re-capped ,keeps going green then maybe a minute or more then goes into protection.my theory is it had weak mj21194 g's hfe was 41,46,45,53,the 93's were in the 80's hfe zone,I've replaced them...
  8. cykotic

    Sansui 9090DB Dial Lights Out After LED Upgrade to Power Meters

    I am in the process of upgrading all of the incandescent lamps to LED. The Dial lights and Signal and Tuner lights turned out beautiful. I then upgraded the left and right Power Meter lamps to LED and now have NO lights on anywhere. I must say that changing the lamps in the Power Meters were a...
  9. Brandon1250

    Sansui 990db/9090db DC on output

    Hello all. I’m kinda in a situation that has me completely confused with this 990db I have. Getting right to it; This unit was given to me with absolutely no back story. Got it to the point where I felt confident plugging it in and putting it on the dim bulb tester. No smoke but of course...
  10. B

    Differences in F-2655 Dolby boards (9090DB compatibility)

    Hey guys... Wanted to swap out the DB board on my 9090 (troubleshooting for intermittent sound from one channel). I found a couple inexpensive replacements, and just grabbed them without being too particular. Upon actually checking them out, it seems like both replacements have different...
  11. H

    9090DB Right Channel only works in Mono

    Hi I'm new here. Seems like the Search function is not working so it makes it very difficult to search the 23.600 + threads looking for a resolution relevant to my problem. I have a 9090DB I bought in 1978. I've had it repaired twice now, pre-YouTube and forums like this. So, I have no idea...
  12. Vinnie Stu

    Sansui 9090db Filter Caps installed in Series Why?

    Filter Caps installed in Series Why?
  13. T

    9090DB F-2624 Driver Board Repair and anomaly question

    First time poster, long time reader! I searched this board six ways to Sunday and didn't find a reference to the anomaly I observed during my repair. I'm wondering if I just missed it. The unit came to me for repair from another guy who was unsuccessful fixing it. In the intervening time...
  14. From bottom up: 1977 Sansui 9090DB, 1970 Sansui 5000A, 1969 Sansui 5000A, 2011 Harman/Kardon HK3390

    From bottom up: 1977 Sansui 9090DB, 1970 Sansui 5000A, 1969 Sansui 5000A, 2011 Harman/Kardon HK3390

    Using the HK3390 as a preamp only. Using the 9090DB as an amplifier only. Pushing a pair of 1992 Cerwin-Vega DX9s directly from the preamp at 4 Ohms. A pair of 1977 McIntosh ML-10Cs with a 1970 Sansui 5000A, and a single 1957 JBL C40 Harkness Lowboy with a 1969 Sansui 5000A in mono
    • cykotic
    • Media item
    • 9090db harman/kardon preamp sansui
    • Comments: 0
    • Category: Sansui Gallery
  15. fdeelros

    Need 9090DB Repaired/Rebuilt - Dolby Board acting up

    Hi everyone, I am looking for an AK tech to help me get my 9090DB repaired. I got the receiver about a year or so ago and replaced all caps with the exception of the filter caps. The common issue of one channel not working because of the Dolby board is too much for my expertise. I tried...
  16. akadrhouse

    Hum Troubleshooting Sansui 9090DB

    I have a nice Sansui 9090DB I'm troubleshooting for a friend. It has a quite discernible hum in both channels. It had been thoroughly recapped when he bought it, but not main filter caps. They used good caps too and were quite thorough in that regard. I decided to replace the main filter caps...
  17. akadrhouse

    9090DB Main Filter Cap Replacement Questions

    I'm replacing the main filter caps on a friends 9090DB. He bought it with a pretty nice recap job about 2 years ago, but it always had a pronounced hum. The original recap included good components, new relay, mostly fine gold and panasonic FCs. As well as diodes and fusistors. But they...
  18. Cliff Jones

    Sansui 9090DB

    Hi am new to this forum, so I really hope that I am posting in the correct place. I received this unit, owner says it wasn't playing in stereo, and had to "wiggle' the switch to get it to play sometimes (fixed that problem, with Deoxit). Well it played awesomely and sounded good. So as I was...
  19. vinylisfinyl

    Sansui 990DB with weak bass...filter caps?

    Greetings, fellow AK'ers, I have a Sansui 990DB that I have been slowly revitalizing over the past couple of years. Overall the unit is in great shape with clear, balanced sound out of both channels, but the bass leaves a lot to be desired. No matter what speakers I've connected it to, the bass...
  20. SansuiSteve

    9090DB F-2657 Power Relay Board - Resistors

    Hello Friends, Been doing a resto on Ser#816110098 and the F-2657 Power Relay Board has some unusual resistors and it got me thinking. Schematic says: R13, 4.7 Ohms, 3W R14, 4.7 Ohms, 3W R15, 100 Ohms, 1W R16, 100 Ohms, 1W R17, 220 Ohms, 5W R18, 220 Ohms, 5W R25, 10 Ohms, 3W R26, 10 Ohms, 3W...
  21. J

    Sansui 9090DB

    Hi guys, new to the group, massive sansui fan, Need some advice on my sansui 9090DB, I think it’s in protection mode, flashes red for awhile then turns green once turned on, does the same when I change speaker selection, anyway was playing using Bluetooth with songs from my iPhone, done this...
  22. Aiden T

    Sansui 9090db selector lights very dim.

    working on a 9090db all other lights on the tuner display are working besides the selector lights aux,phone,fm,am. I know these are light depending on the position of the selector switch, the lights are dim and if i move the switch around some i can get them to light up a little better. I have...
  23. E

    Need help on a 9090DB

    Hi all! I have been refurbishing a 9090DB for a friend. I have done an entire cap overhaul. I’ve replaced the matches transistors, the lights to LEDs, and every other upgrade I think possible. I reworked the Dolby board (caps, fed throughs, replaced ribbon cables). Everything works and sounds...
  24. S

    repair advise wanted

    I have a Sansui G9000 and 9090DB both inoperable at the moment and I would like to have them repaired. I am located in Michigan on the west side of the state near Holland. If anyone knows of a repair shop that can be trusted please advise. I am not adverse to shipping these but would prefer...
  25. teddyfreddy

    Hello from Wisconsin

    Hey, My name's Elijah. I'm new here on Audiokarma, I'm currently trying to repair a Sansui 9090db that I picked up for $15 from a lady that was trying to sell off everything from a property that she's trying to renovate. I came here to get advice from people with more experience. I already...
    • teddyfreddy
    • Thread
    • 9090db camera film new photography sansui sansui9090db
    • Replies: 18
    • Forum: Introductions
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