Sansui 9090 output transistors. The 4 from the LEFT Chanel measured around 0.

Sansui 9090 output transistors Therefore you cannot measure across a pair of emitter resistors (as they are not connected in series). Well, These Guys(The Sanken Transistors) Are Rare, No Longer In Production and Thus, Expensive. Rest of the specs are the same. A couple of pointers: If you want to tell which output transistors go where, look at the circuit The Sansui 9090 is a high output version of the 8080 stereo receiver with 110 watts continuous, per channel (minimum RMS) at 1000Hz both channels driven into 8 ohms, with no more than 0. My signal tracer shows no signal coming from the outputs of the tuner board. I removed the old PS board and installed the new one being careful to re-solder all the wires where they belong. Thread starter FunkSquad; Start date Jun 7, 2014; 1; 2; 3; Next. I did find 2 blown outputs that I replaced and now both channels work. Thread starter mntnbkr; Start date Apr 30, 2017; M. IOR 5B2 / 2D - $20. Thread starter Rubbertoe81; Start date Apr 16, 2024; Rubbertoe81 Member. The info is scattered in many The Sansui G8700/G871DB use the 2SB681/2SD551 pair that are rated at: 150V, 12A, 100W, 40-140hFE, 15MHz. Vehto; Jan This allowed Sansui to compete head to head with other receivers in this area, and the area of overall sound quality. - Aseem 05:05:46 5/27/2004 (2) Let me reiterate. Apr 30, 2017 and a power supply board / heatsink with output transistors attached (ebay). gcgst. As you probably already know, 9090 receiver has quasi- complementary power stage with 8 pieces Sanken 2SC1116 TO3 NPN transistors, so it is not the same as 9090DB which has complementary output stage with 4 PNP and 4 NPN TO3 transistors. Original post: On a recent thread, "Sansui BA3000 Recap", I recommended that when more than 1 output transistor are paralleled in some of the big amps, like the 9090 series which has parallel pairs, or the BA3000 which has parallel triples, they should be matched for gain. The typical failure mode is a unit that has been in storage a long time and then powered up. The 9090 uses 8 NPN transistors. I did some output transistor troubleshooting with the driver board in - if I pull the outer two transistors on just the right side the short goes away and it behaves normally I can even set the voltage for the left speaker to a pleasant 0. Perhaps in your tests some transistor got damaged. I noticed about 2 years ago occassionally one of the channels would static in and out, but nothing a little tap on the front right side of the unit would not fix. I would like to continue fixing before recaping. The driver topography differs greatly from the 9090, comprised of a complimentary output stage vs quasi on a OnSemi MJ15003G or MJ15015 are popular substitutes for T03 package NPN output transistors. I am raising the white flag because I don’t know what else to do to get this working. When we got it, one of the channels had the outputs blown, so we replaced all 8 output transistors for both channels. The other major difference between the db and 9090 is the I have a Sansui 9090db that has a very quiet (almost inaudible) speaker output. The amplifier boasts a full complementary output topology with eight output transistors and a RMS power rating of 125 watts/channel into 8 ohms from 20Hz to 20kHz with no more than 0. • All output transistors are the original Toshiba devices. Sansui 9090db output transistors, knobs, etc. 763-533-5377 SANSUI 9090 DB Receiver ** Output TRANSISTOR SOCKETS **Complete set. I recently pick up a 9090 receiver. Musicman524. I figure that you already know that the output section is different between the 9090 and the 9090DB. Jun 11, 2012 #1 My 9090 has found a new way to be a pain. grafxdesin AK Subscriber. It is indeed in excellent condition. I am currently working on a Sansui 9090 barn find and so far I have 2 shorted outputs, 2 drivers, 2 fuses, and 12 open resistors. The 8080 only has 4 output transistors, so only 4 emitter resistors are needed. ie Some People Insist To Replace The Blown Output Transistors with The original Sanken Transistors. An eight stage Varactor tuned front end ensures that this source is unequaled in its ability to receive and replicate a pure FM signal. DonQuixote99. New precision matched differential pair transistors were installed with modern, low noise TO-92 Fairchild type. 1% FREQUENCY RESPONSE (at 1 watt) I bought this receiver probably 8 years ago and only the left channel worked. Matching from PNP parallel sets to NPN parallel sets is not necessary. Heck, much of the current gain of output transistors is swamped out by the emitter resistors. Replacing differential pair transistors with modern equivalents; Calibrating Bias and Offset (if applicable) Aligning FM (if applicable) Our differential amp output mods can be done to all these units, with the exception of the 505/555(A). Rectifier, Bridge Rectifier. RMS power output INTERMODULATION DISTORTION (70Hz : 7kHz=4:1 SMPTE method) eased erade ne a ybiaion Sno eats less than 0. BEAUTIFUL SANSUI 9090 8080 AUDIO OUTPUT TRANSISTORS OEM ORIGINAL WORKING BEFORE REMOVAL EIGHT 2SC1116A 64Y from Log In Try for free Log In Try for free Price Guide; Marks; Library SANSUI 9090 8080 STEREO RECEIVER OUTPUT TRANSISTORS Transistors, ‘Output’ transistors; Toshiba 2SA663, 2SC 793 TO-3, Metal cased output transistors (see; Sansui Six / 6, Seven / 7 and likely others) - $25. So in your case if the output/driver transistors are ok and the +- rail voltage is in spec, I would suggest you check these resistors. The 9090 (NON DB) is a quasi-complementary output circuit (NPN transistors only) (the DB version is true complementary). I’ve checked all eight output transistors 3 times now and all are good. (note that output transistors are not installed yet). "the MD-209 is equipped with an output stage that generates power through the use of 20 Sanken output transistors (10 per channel)" "From a history of world-leading RF designs, we have put our best into the MD-209. With an increase in output to 125Watts and integration of the Dolby Noise Reduction circuit. The 9090 has 8 output transistors so 8 are needed. The G-33 uses 4 pairs of output transistors for each channel. All told both receivers needed 80 items each replaced which included caps, resistors, transistors, ect, I too have had a Sansui 9090, 990 and 9090DB receivers. One more observation is that the filter capacitors are not discharging even after plugged out for 1 hour (showing around Both of my receivers needed extensive repair, all the caps and resistors on the power supply board needed replacing. This article is can be read in comparison to the previous Sansui 9090 New precision matched differential pair transistors were installed with Sansui 9090. The thermal transistors are round, mount with a metal loop and have three wires. Also note the schematic will have 2 sets of voltages, and some differing part numbers. These models can be hard to to work on due to the board mounting style, but have some of the best looking VU Meters around. com site has at least two (possibly more) available covering the 8080 . I Will work on that later. They are notated for 8080 vs 9090. new pre-drivers were installed with low noise, TO-126 type Fairchild devices Transistor Cross-Reference chart showing stereo receiver / amplifier models that use the same output transistors. I am presuming you mean the Sansui 9090/8080 The driver boards are different and the output transistor arrangement is different. The 9090DB is considered one of the "best of the best" receivers from the 1970's, and certainly a must-have for serious Sansui collectors. The transistor could have just died, but keep an eye out for anything unusual that might have fried the output transistor. I was looking through my special stash of unobtanium output transistors, trying to find 4 2sc1116a's. Submitted by ribbels22 on October 28th, 2013. RMS power output and total harmonic distortion TOTAL HARMONIC DISTORTION Dadi Unie dataseleia wat ee senesters less than 0. 9090 trim pots. Who or How Many of You'd say that the output transistors contribute to the Amplifier's sonic characteristics. The 9090 added semi-complementary output transistors to the mix, 8 of them versus 4 on the 8080, upping the advertised power to 110 wpc minimum @ 8 Want To Start A Discussion Here. Thread starter Tomcow; Start date Aug 24, 2021; Tags sansui 9090 Prev. Replies 21 Views 4K. wparker1934 New Member. Hey all, I am in the middle of restoring a 9090. 3A and 5A output for the DUT and drivers. dr*audio Fish fingers and custard! Jan 16, 2004 #8 I worked on a 9090dB last summer that looked different from the service manual also. Thanks for all your accumulated knowledge. CousinLarry New Member. What transistors can replace C-5802 and the one transistor on the protection board that is red in color and appears to have 27 something on top and the number 1000 underneath?? As far as I can tell all 8 output transistors are good. com). Today were detailing a Sansui 9090DB Restoration. Mar 17, 2022. DB models – $925. A second consideration for this sub list could be the Sansui 9090 which uses eight (8) 2SA1116A. Sanken 2SA1068/2SC2493 are for general purpose and 150V and Sanken 2SA1068N/2SC2493N are special made for Sansui and 160V. have any Bloody Sansui :uzi: Seems stable enough, so I'll leave it alone. I got Sansui 9090 $1225 – sold . The 9090 was originally equipped with 8Sanken 2SC1116A transistors. and draw excess current through the output transistors unnecessarily. I can contribute most of it to someone who wrapped tinfoil around one of the 10 amp fuses for the outputs. daveyh AK Subscriber If you are working with a Sansui 9090 note that it does not have a bleed resistor on the Filter Capacitors. There'Re Plenty of TO In this episode I look at the performance of Sansui 9090 AM/FM Stereo Receiver. Thread starter CousinLarry; Start date Dec 31, 2021; C. The driver board definitely has some bad fuse resistors on it. All the 9090s and 8080s use thermal transistors. The service manual is for both the 9090 and 8080 You will notice the schematic itself for the 9090 also lists the transistors specific to the 9090. While at it I also went through BA-2000 and AU-717 service manuals to find other transistors used originally in these things and searched the forum. Confirmed that all the output transistors were good by removing them and using a transistor checker. When I plug a source to the inputs AUX Transistor Cross-Reference chart showing stereo receiver / amplifier models that use the same output transistors. You might try probing for DC voltage at the each channel's driver board output to narrow down which channel is the culprit, maybe it's both. Custom forms or amounts will not be altered. You can replace the original output transistors with modern OnSemi transistors, MJ21194. Mar 23, 2024. I started checking the voltages in the F-2436's comb connector and got some really odd readings. Let’s keep e B a y fun. 3%. I have one myself Produced during the Sansui golden era and only for three years, beginning in 1976. Cheapest fix, but least likely is a fault in the protection circuit itself, next cheapest is a bad power supply, the most expensive and most likely is one or more output transistors Hello, I have a Sansui 9090 Reciever Problems: RIGHT output channel is dead, I took out all 8 transistors and measured them with a Fluke DMM on diode test. 00:00 Introduction 03:11 Basic Features06:12 Measurements10:10 Harmonic Conte Hi all -- I'm a longtime lurker and first-time poster. I need a little help. Others in the line included the 771, 661, 551, 441, 331, and 221. One of the most significant upgrades I have been installing in these vintage units is the upgrade from the original axial silicon diodes to ultra-fast, soft recovery, low noise Schottky TO-220 mounted rectifier diodes on a high quality Hi am new to the Sansui forum and have aquired an orphaned 9090DB. My 9090 took out the left side channel. The inrush surge of the main filter caps overloads those fuse resistors that have already drifted over time. Sansui 9090 - f-2546 C11 explodes. He also told me about some mods for the driver board which is 2436-1. 55 V, the 4 from the RIGHT Chanel are in short. I have located some SD424's that are a replacement. sansui 9090, Owners manual needed - sansuiaddict on July 08, 2004 at 19:07:10: (0) Output transistors for Sansui AU-@707DR - Erden 13:08:13 5/27/2004 (1) Re: Output transistors for Sansui AU-@707DR - Arsenio 11:47:11 5/29/2004 (0) Manual needed for sets with SDK 4913- I. We have 2 Sansui 9090DB Stereo Receiver manuals available for free PDF download: Service Manual Sansui 9090DB Service Manual (28 pages) Brand: Sansui | Category: Stereo Receiver | Size: 9. gcgst; Sep 23, 2005; Exclusively Sansui; Replies 12 Views 2K. On the BA-3000 we add in-line fuses to rail voltage, as often we see blown output transistors. I figured when I retire I will look at it. Well I think my 9090 is now toast. The G-22 uses the same board with just 3. R33 and R34 typically don't fail as a result of shorted output transistors. Before I start tracing back from the outputs with the Sansui 9090 No Output From FM. The poster was selling it for his Dad, and at first thought it just had minor issues. A 1uf is the max I Released in 1974 the Sansui 881 retailed for $529. They should I've read several threads on here about replacing the transistors/caps on the driver board (F-2436); however, what I've found commonly listed for the 2SC1708 is the KSC1845EBU, and that's not currently available Good afternoon, I recently was gifted a Sansui 9090db that is in OK shape. Every now and then, 2 outputs at a time will go bad (usually rated min. Jun 7, 2014 #1 You have probably got blown/shorted output transistors and or driver transistors. All were recently replaced with correct subs and tested good (6 way test). Another 9090 that we have completely restored, recapped, and added our Differential Current Balance modification. Nov 5, 2023. Sansui 9090db no output (power or pre) moodydan; Aug 21, 2016; Exclusively Sansui; Replies 14 Views 1K. That's also why it is crucial to always test things on a DBT using a 100 watt I'm trying to resurrect a Sansui 9090 , and am having trouble with the Amp Driver board. I tested the output transistors in-circuit as well so I didn't have to pull off the heat sink. Woodang was nice enough to get me four 2SC1116a output transistor. 9090DB No Sound all of a sudden. This is my first effort to restore anything so I am learning as I go. The amp would oscillate a bit on the output. C. in. First I plugged it in through DBT and here are what I observed 1. I’ve replaced about 12 resistors on the output board and double checked all the transistors and diodes on that board. The driver board has been removed from the receiver and it is only connected to it for the +/-61V, chassis ground and signal (in) connections for testing in isolation. The power supply on the DB model uses a pair of 12,000 uf caps, the 9090 uses a pair of 6,800 uf caps. If you have a 9090DB or 8080DB then there are two variations to the driver boards. You can post a link to this thread in the sansui forum so you don't open 2 threads about the same problem. Are any of the transistors overly hot compared to others and does bias look okay? BTW, it's a great receiver. 9090 redo attempt Sansui 9090: noise in the Headphones. Sansui 9090 receiver. I am restoring a Sansui 9090 early production that was not working. I have two Sansui units . @Kale boards w/"N" You really need to check the emitter resistors, drivers and pre driver transistors. Sansui 9090 Driver board troubleshooting - out of ideas! Johnev35; Oct 27, 2023; Exclusively Sansui; Replies 9 Views 691. The two Sansui 9090 Receiver. 1; 2; 3; First Prev 3 of 3 Go to page. Dec 31, 2021 #1 I've pulled a few transistors to check them and everything seems fine on a meter. The better one is named sansui_9090_8080, whereas the one named sansui_8080_9090 appears to be The hfe of a transistor can vary a great deal depending on the current level that the hfe is being measured at. Pull and test all the transistors on the board: drivers, bias transistors, input differential pairs. This is becoming a nightmare. Checked the emitter resistors on the PS board. That's reason there is space for additional pair of output transistors. That transistor is the VAS (voltage amplifier stage). At an underrated 60 watts per channel into 8 ohms it packs plenty of power and total harmonic distortion comes in at a respectable 0. Thread starter wparker1934 . You need to The Power Supply for the Sansui 9090DB is built off two full wave CT bridge’ rectifiers with a . 95 and was the top-of-the-line receiver in the Sansui lineup at the time. D05/6 low voltage due to low current flow or just old. I checked all output transistors and they are all tested good. F. All told both receivers needed 80 items each replaced which included caps, resistors, transistors, ect, before they finally came back to life. Substitute 'generic' outputs and bad original outputs removed and we 'hand picked' from our extensive collection of original Sansui 9090 output transistors, and closely matched 'quads' of outputs to re-install. 1 of 3 Go to page. Sansui 9090 No Output From FM. Next Last. All lights on irrespective of power switch pressed or not. Lots of good info. I powered it up on the dim bulb and got the bright light:yikes: I pulled the 8 outputs and checked and 1 was testing bad With the board removed, I wanted to share that every single semi and fuse resistor on the f-2624 can be successfully tested in-circuit (except the STV3Hs which I tested by pulling a leg and using a power supply and dropping resistor). Checked for opens and solder If the output transistors, the ones mounted on the big heat sink on the back panel are removed there should not be any voltage at the speaker terminals. The 9090 output stage differs quite a bit from the 9090DB version, featuring a PP complimentary output and gain differential stage. But a transistor would work much much better. Exclusively Sansui . Sansui transistor substitution collection Hi, I've been busy figuring out transistor substitutions for my AU20K. Once reseated, DC measurements re-taken. I cannot locate a source for the SC1116A's on the unit. Sansui did this on other models as well. 2 % distortion. Mar 7, 2023. Green protection light. 1% total harmonic distortion (THD); overall Sansui 9090 vs 9090db. R. Clip one probe to the Blue, the other probe to chassis (ground) to be sure that channel is less The output transistors all test good, but it won't come out of protection with the F-2436 installed. Well,it is still in protect mode. T. You can identify which varation you have by looking at what is mounted on top of the heat sinks. I am not used to working on anything this big and am having trouble even turning it over on my bench. The problem was the flameproof resistors on the driver circuit board. The first time was my fault I hooked up a set of 4 ohm speakers to A, and a set of 8 ohm speakers to B. SOLD Heat Sink, Power amp heat sink (less output transistors) - $25. 1 of 2 Go to page. It worked for a while, then the protect mode light turns on and blinks and will not let the unit start. They are the speaker out from the Amp/output transistors. - Pete I recently repaired a 9090DB with low output on both channels, only in my case I got about 5 watts on one channel and 20 on the other. It has all NPN output transistors, the DB is fully complimentary It Sansui 9090 Blowing fuses 250V 10A Instantly. This unit was gone thru before me amp board was upgraded with I would say Sansui 9090, 8080, 990, 890, 9090DB, 8080DB, 990DB, 890DB recap/restore – $860. Mainly it is missing all 4 output Hello all, A workmate here needs some replacements for his Sansui 9090db, as follows: 2SB554 2SA899 2SA733 2SC1400 2SC945 Can anyone Sansui Lot of 8 OEM Output Transistors for 9090DB Receiver / (4) 2SD424 and (4) 2SB554 * Removed from a Working Sansui 9090DB Unit * FREE SHIPPING TO CONTINENTAL USA It could be due to the new transistors. The G9700 & G8700 are in the same Service Manual, if anyone needs it PM me. It had plenty of issues that I had to fix (some output transistors failed, driver board, protection, service bulletin not applied). I just bought my first vintage receiver a few months ago, a Sansui 9090 Db! However I keep toasting the output transistors. Thread starter grafxdesin; Start date Mar 27, 2024; Prev. First one is a 9090 and the second is a 9090DB. Sometimes replacements have different pinout. Part swappers beware all my parts are marked. 7 Alex Audio Video and Computer Service 4211 Rhode Island Ave N, New Hope, MN 55428. 9090 output transistors. Jun 9, 2015. Subscriber. The amp will still all work normally as long as nothing else is faulty. Some time ago, maybe 6 months I powered on the unit after a long period of not using it to find that no sound at all would come out of the speakers Hi folks, New to the site . The chart in the 9090 Sansui manual confuses mA and mV for this reading. " No "N" on either in the Sansui AU-X1 material. Need help troubleshooting Sansui 9090. I got caught out when I bought some new transistors for an old amp. Before I start tracing back from the outputs with the Fully restored Sansui 9090 for sale. Sansui 9090 no green light ??? HomerJSimpson; Jul 16, 2009; Exclusively Sansui; 2. I remembered a post from echowars where he said that these transistors are regularly counterfeited. Go. I asked him if I hi all, did some changes to my sansui 9090, among other things: - total recap (including 6800uf caps) - protection board: relay, transistors, resistors - output transistors today I tried to switch it on andit burnt the circuit paths from diode 2/3 to fuse 3/4 (see picture) where's He is going to repair not only the blown transistors (I believe that is what he told me-I was driving when I got the call) but replace all of them since they were all original. Similar aesthetics to the 9090 and Black 990(E. Note that electrotanya. It has a highly selective FM However similar in appearance and projection the build features are very different in the 9090 and 9090DB. Now the unit is working, but I still get a noise. (TR07) as that will force the output stage to draw no current. Testing finds problems in the output transistors - fuses also blow. If you have a 9090 it's not an issue. As EW point out, usually one of the meter leads needs to be moved from one terminal to another on the meter. Apr 16, 2024 the outputs could blow nearly instantaneously. Sansui 9090 driver board issues. Those small component testers are measuring the hfe at a rather low current for output transistors. As for your issue T-03 output transistors. Posted by onemug (A) on February 13, 2014 at 12:03:44 Besides the addition of the "db" board on the later model, I've read "The 9090 is a quasi complementary design. As mentioned, on something this age (and with experience of At location R30 I found a bad/open fusible resistor, so I replaced it along with 11 other resistors, 4 capacitors, and 4 transistors that were included in the kit I bought online from Vintage Stereos LLC (qrxrestore. M. televe. Plenty of Sansui experts here so I expect more advice to come. It's my understanding this is an older design. ea. The db 9090 unit has a pretty "hefty" output stage with paralleled class A type circuits with NPN/PNP matched characteristic transistors. 1% at or below rated min. It's gonna need a good amount of work but I do like a project. ) BP-Transistors 2SD438/2SD3# and 1211 were all replaced with MPS TO-92 transistors along with the 1OHM fusible transistor. Thread starter wparker1934; Start date Jun 11, 2012; 1; 2; Next. 45 MB Once reseated, DC measurements re-taken. The 8080/9090 series comes to mind. It is not connected to the power output transistors or the protection relay board, and the Preamp Out/Main In links have been removed so none of the preamp controls, switches, etc. Turned on A+B, well it lasted about 5 minutes,I took the cover off and discovered two blown fuses. LBPete. . With the output board If not, check the rest of the circuit is OK, continuity across the 3 resistors and check transistors. Output transistors used such units as Bi-Amp, Marantz, Mitsubishi, NAD, Onkyo, Pioneer, Rotel, Sansui, Technics, Yamaha and You need to remove the output transistors on the same side as the damaged side of the driver board (I believe its the right channel right side) . mntnbkr New Member. My Sansui was working again and sounding GREAT !!! I was so happy my first circuit board re-cap job was a great success. Sansui 9090 replacement transistors for driver board. The driver boards are different and the output transistor arrangement is different. When looking at Sansui 9090. Installation of those transistors must be done by a qualified technician only!!!! Because transistor is New Old Stock, it might have some scratches, but it is unused and tested by semiconductor tester. The output transistors ran so hot that it was only a matter of time before one shorted - and one finally did (I think). Very probable that you have shorted output transistors and cascaded damage to components on the driver board. 000V! Sansui 9090 Driver board troubleshooting - out of ideas! Johnev35; Oct 27, 2023 Heat is the enemy of electronics and you could easily toast the output transistors and then have even more problems. Like I said, "almost" identical, but there are a few differences. MrChevelle; Apr 21, 2018; Exclusively Sansui; I got a non-working Sansui 9090. Does this alone classify it as a "high speed amp". The schematic for the 8080 will list the transistors for that. Sansui 9090 vs 9090DB The power supply and amp sections are completely different. Sansui Repair ~ QRX-9001 Repair ~ Specializing in QRX-9001, 9090, 9090db and the Sansui QRX line. The 4 from the LEFT Chanel measured around 0. oxx89; Nov 7, 2013; Exclusively Sansui; Replies 12 Views 1K. The output transistors needed replacing along with quite a few other things. Sep 27, 2005. Be careful as this 9090 uses a different driver board than the 9090db. An open BIAS trimmer will turn the output transistors on full blast at the speed of light. Fresh Maybe it is the last chance to get very rare output High-Speed TO3 transistors for yours premium Sansui amplifier. I checked the new The output transistors needed replacing along with quite a few other things. Yesterday, I spotted this 9090 on CL for $75 and jumped on it. Test all of the emitter resistors, this can be done in-circuit once the transistors have been removed. Once driver board was replaced, then the tech moved to address the output transistors. The 9090 is the little brother to the 9090db series abd larger brother with 110W output compared to the 8080 Sansui we featured a few months ago on a restoration. The 9090DB uses 4 PNP/NPN pairs. Controls cleaned (deoxit) Dim bulb is ok I need help troubleshooting the driver board (F-2436) on a Sansui 9090. Output transistors used such units as Bi-Amp, Marantz, Mitsubishi, NAD, Onkyo, Pioneer, Rotel, Sansui, Technics, Yamaha and Hello, I am working on bringing a sansui 9090 back from the dead. moodydan; Feb 2, 2015; Exclusively Sansui; Replies 13 Views 6K. It has what appears to be factory "Fuse" mods on the driver board. Sansuioldaudiophile (605) 100% positive; Seller's other items Seller's other items; Contact seller; Sansui 9090 dB; Sansui 900; Sansui 8080 Receiver; Sansui Au 9900; Sansui 7070 Receiver; Sansui 9001; Sansui 2000 Receiver; Sansui 909; Sansui Au D 9; I have emailed Sanken Japan about it and to my surprise they answered me the same day. Reactions: Hyperion. Also, check the replacement pinout . Full rebuild of driver-All transistors new-Elytic caps replaced - bias pots replaced Output Section-All final transistors removed cleaned and new thermal paste applied Bias and DC offset adjusted to factory spec Misc-All controls cleaned - backlight mod complete (keeps lights on in all modes) The 8080 features a quasi complimentary output stage where as the 8080/9090DB features a NPN/PNP push pull topography, the 8080 also only features a single RIAA input and formats the outputs to parallel rather than in I have 48 years of parts accumulation. Sansui 9090 bias current errata. Fresh - The output transistors all heat up very fast and get very hot when they are supposed to be idling. FunkSquad New Member. ledcjb ytc tayf ayguy bgfop xgqrdfua vhzyf foywl nkwj wwa abxn ooss jmowktbb xqu vnlb