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transistors

  1. toymanmsp

    Help with Sansui 551

    Greetings all, I'm starting to post more on AK. It's fantastic that there are so many members that are willing to help newbies like myself. I've replaced all of the caps in the 551 with the exception of the tuner, which I will do once I've finished replacing the transistors (Pre-Power-phono) on...
  2. mauser

    Replacements for 2SB557 and 2SD427 transistors

    Hello, I have some dead transistors in a Sherwood S-9910, and am looking for a viable new replacement, since it seems that Chinese counterfeit transistors are actually a thing. I have seen 2 different sets of transistors mentioned consistently in the forums, and am interested in the difference...
    • mauser
    • Thread
    • 2sb557 2sd427 replacement s-9910 sherwood transistors
    • Replies: 4
    • Forum: Solid State
  3. Taavip

    Kenwood KA-5500 left channel repair

    Hello from Estonia! Hope you are all well. Got my hands on this really sweet '77 year Kenwood amp. Unfortunately left channel is dead. I really like this amp, so I would like to repair and restore it. Hopefully you can give some little guidance needed to bring this amp back to life. Before I...
  4. Sergimm

    Question about replacing old Transistors

    I am recapping an old Marantz 1050. In the last page of the service manual there is this message: Transistors in the "A" column are the ones the amp currently has. It looks like the 1050 doesn't have any of the infamous transistors from the top ten worst transistors thread. Still this message...
    • Sergimm
    • Thread
    • marantz replacements transistors
    • Replies: 1
    • Forum: Solid State
  5. P

    Fake NEC Transistors?

    Hello everyone I own an old Marantz PM710 DC and the power transistors of one channel are off. The transistors are the following: 2SC2588A & 2SA1108A. These are very difficult to find as you already know, but after a lot of search i found an AliExpress supplier who seemed to sell original NOS...
  6. S

    Denon POA 2400 spares equivalents help

    Hi, I own a Denon POA 2400 which ran in to problem sometime back and the technician mentioned that there are few transistors which has gone bad and are not available in the market. Can someone help on pointing alternate equivalents? Or to place where I can buy them ? Below is the list...
  7. P

    Kingston Deluxe Bass Amp Transistor Replacements

    Hi, I'm working on a 1960s deluxe bass amp. I can't find a schematic, and google searches haven't turned up any cross references. I'm trying to find suitable replacements for the following transistors: tk30 xc37 6yz xc372 ey3 xc37 ey2 C1000 Any help would be much appreciated. Thanks in advance!
    • p gioan
    • Thread
    • c1000 kingston deluxe amp transistors xc372ey3 xc376yz xc37ey2
    • Replies: 1
    • Forum: Solid State
  8. Richs_Trains

    Marantz 4300 right channel phono problems

    Hey all, I have a 4300 that I had not used in a while. I bought a repo WC43 cabinet and decided to mount it and connect it up. While going through the testing of all the functions, I found the right channel of the phono section sounds about 50% and has a static sound (like a bad transistor)...
  9. F

    Sony PS-X70 Wobbly Speed 33/45rpm

    Hopefully someone can help me out here. There's a 'wobble' in the speed (both 33 and 45rpm). I started measuring the voltages on the power supply and there's only one value completely off Q406 64.4V instead of 35V. Perhaps someone can give me some pointers what might be wrong?
    • freebee
    • Thread
    • measurements sony ps-x70 transistors turntable speed
    • Replies: 6
    • Forum: DIY
  10. D

    Ka4002 right speaker only works with loudness button but no bass.

    Hello all I joined the forum a little while ago and have been reading through posts with great interest. As per the title, I picked up a 4002 a couple of weeks ago that has a problem with the right side. With the loudness off, I can barely hear the right speaker at all, with the loudness on it...
  11. thorpej

    A message from The Electron Tube Information Council

    Just leaving this here for your enjoyment. http://www.rcaselectron.com/TNT.html (Oh how I would love to find an original copy of this.)
  12. capcapsaicin

    New forum member with a new to me G6000 that needs some help

    New member to this Sansui forum and I just picked up a Sansui G6000 that needs some serious help. No sound from either the driver outputs or the headphone output. All the lights work however so that gave me some encouragement to try to get this thing working again. Thank you to @kevzep for...
  13. G

    SX-636 Repair Help

    Hey guys, I picked up a Pioneer SX-636 in good exterior condition a while back and have been working on repairing the thing for quite a while now. When I got it, it barely worked, so I recapped all of the important parts of it, including the large coupling caps, which had bloated like nothing I...
  14. B

    MC2100 positive output failure

    Probably very early MC2100. No fuse, open power cord. Replaced electrolytic caps on preamp board. Others tested fine although the ones on the driver cards look horrible and will be replaced. Powered up on Variac and it drew over 2A at just 20VAC. Pulled each TO-3 transistor one at a time and...
  15. zealth1960

    Pioneer SX-1280 NEC D746/B706 Output Transistors

    Just got a blown SX-1280 Going to replace Output Transistors NEC D746 and B706 Im finding these hard to find and pricey Are there any cheaper replacements for these ??????
  16. david winter

    Output transistors subs with higher gain

    Hi, I've been wondering whether the gain of output transistors is critical if the subs have 2 to almost 3 times the gain of the originals and what changes should be done to compensate. I'm interested in this quesiton in a general case after trying to find subs for a Sony output stage using...
  17. M

    Sa 5200 low power output

    I have a couple sa 5200s, each with its own issues. The first one sounds good, audio is balanced, no crackle or hum, BUT audio output volume is about a third that of my other sa 5200. I thought amp circuit transistors, but both channels failing in exactly the same way?? How about power supply...
    • Mmj
    • Thread
    • capacitors low power low volume power supply sa5200 transistors
    • Replies: 1
    • Forum: Pioneer Audio
  18. PooPoo

    HELP a brother out! I need some advice on how to fix my Marantz Model 18 scope.

    Just replaced the 4 transistors with replacements C2611 that were mounted on the heat sink on the scope board. Another member told me the pinout were the same as the originals but still no scope??? The crt tube has a glow on the bottom but won't turn on.??? Anyone might know where I should fix?
    • PooPoo
    • Thread
    • marantz model 18 scope transistors
    • Replies: 48
    • Forum: Marantz Audio
  19. Richs_Trains

    Marantz 3250B Phono Section Transistors

    So here's the story, got a 3250b cheap and beat up. Got it cleaned, de-oxit, and recapped all the electrolytic caps. Powered it up and all is good except lots of white noise on the phone section. I found 2SA970's and 2SC2240's and replaced those. Still had the noise, tried to find 2SC1885's...
    • Richs_Trains
    • Thread
    • 2sa970 2sc1885 2sc2240 3250 3250b marantz phono transistors
    • Replies: 5
    • Forum: Marantz Audio
  20. Awesomeaudio

    Transistors, How do they work ?

    I stumbled upon this very cool educational video and thought I'd post it up for those, including me, have a hard time understanding how stuff works on an electron level. The visualisations in this video really makes it easier to understand than someone throwing technical jargon at you in the...
    • Awesomeaudio
    • Thread
    • bi polar npn pnp silicon conductor transistor function transistors
    • Replies: 6
    • Forum: Solid State
  21. Chriswashere

    Sansui au-888 transistor replacement issue

    Hello all. I have a Sansui au-888 with the famous "crackling transistor issue". This should have not been a big deal. Just pull the "flying saucer" transistors out, then install the new ones. However, after doing this, the amp started to smoke despite all transistors being installed correctly...
  22. B

    Replace Transistor Question

    Hi there, refurbishing a Pioneer SA-7500 with intermittent relay. For substitute transistors, can I used higher rated Voltage. (Such as is the case for capacitors - higher V can be used as substitutes as long as uF is met.)
  23. cwh

    Shorted KA-7100 output TR

    What are current recommended subs for Qe27-30? My list includes: -MJ21193(4)G -MJ15022(3)G -KSC2690A, KSA1220A Carl
  24. sansevy

    Another Yamaha CR-2020 Rabbit Hole

    I've had a CR-2020 on the bench for a few weeks now and I am chasing problems all over. I completed the service bulletin work and encountered smoke from the left side of the E. Cap board when I powered it on. Based on the thread where Avionic helped Bluhn321, I swapped out a bad transistor...
    • sansevy
    • Thread
    • cr-2020 smoke transistors yamaha
    • Replies: 10
    • Forum: DIY
  25. writesds

    Sticking Caps in Marantz 2216b

    I'm new so thanks in advance for your help. First, any advice on removing caps which appear to be stuck to the board? (See photo) I desoldered all pins and these large 4700 caps on the output board are not budging at all. Second, I picked this receiver up with a blown transistor. The guy...
    • writesds
    • Thread
    • marantz recapping transistors
    • Replies: 16
    • Forum: DIY
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