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transistor

  1. david winter

    Sony STR-3800L - Transistor replacements on output board

    Hi, I need to replace the transistors on a Sony STR-3800L output board as both outputs are shorted. The last four transistors in the list differ with the service manual. References in bold were originally installed in this amp, which may be an early specimen (serial at rear is in the 5007xx...
  2. david winter

    Mitsubishi LT-5V - Photodiode replacement in tracking servo & electrical (OPA) adjusments questions

    Hi, I have some difficulty repairing a Mitsubishi LT-5V vertical linear tracking turntable. I replaced one of the two photodiodes (broken) in the tracking servo assembly using a TEMD6200FX01 carefully installed and positioned above the light bulb. I need to know how to make the electrical...
    • david winter
    • Thread
    • linear mitsubishi photodiode transistor turntable
    • Replies: 0
    • Forum: Turntables
  3. L

    Magnavox Astrosonic

    I have a 65 Astrosonic 204-18-00, that I will be re-capping, I found this one linely piece soldered on the bottom of the tuner chasis. Is this a resistor, capacitor, or something else. I have a photo fact, it stops with 204-17-00, but it shows the piece. It kinda looks burned but it also looks...
    • LKTR
    • Thread
    • astrosonic console help magnavox transistor
    • Replies: 4
    • Forum: Solid State
  4. A

    Known Issues in 70s/80s components

    Hi, Working on a SX-3500. Are there any known common issues with components? For example: Are transistors proven to become leaky/noisy? Do diodes/zeners drift? In an RT tape deck the transistors become noisy requiring testing or replacement. Thanks.
    • ampman
    • Thread
    • components diode leaky transistor zener diodes
    • Replies: 0
    • Forum: Pioneer Audio
  5. david winter

    Sony PS-4300 - What replacements for 2SC1173(Y) and 2SC1760 ?

    Hi, I am trying to finish restoring a Sony PS-4300 turntable (fully recaped) which speeds start fluctuating after a few minutes. The 2SC1173Y is the output transistor of the motor control circuit (Q110, TO-220, BCE) and tests with a gain of 88 (should be 120+). As I don't have any KSC-1173Y, I...
  6. Flamedemon

    Transistor Replacement for Sansui (A-9) Integrated DC Servo Amplifier

    I recently purchased this amplifier as non-working and when I tested it the left channel sounds distorted. I opened it up, tested the transistors and found one of the left transistors is broken. I want to replace them all. Does anyone know a matching one that I can purchase on digikey or some...
  7. S

    Marantz 2230 Power Supply P800 transistor H2 hot to the touch - normal?

    [Edit: It's the H802 transistor, but I can't edit the title of the thread] Hi, I am in the process of cleaning up and recapping a Marantz 2230 that has been in the family for over 50 years. I had a relamp kit I bought in 2020 still laying around, and decided to go all-in and do a full restore...
    • sschaper
    • Thread
    • 2230 hot marantz p800 recap recap and restoration restoration transistor voltage readings
    • Replies: 3
    • Forum: Marantz Audio
  8. mcaddie7

    Transistor Replacement Help

    Hi! Looking to replace some transistors but am getting lost in long threads and my head is spinning. Is any transistor replacement okay as long as the specs are higher than the last? What about a website like this that just gives you comparable ones? Alltransistors.com The transistors in...
    • mcaddie7
    • Thread
    • harmon kardon 930 hk twin power transistor transistor equivalent
    • Replies: 11
    • Forum: Solid State
  9. A

    Thermal Pad Recommendations

    Greetings. I am refurbishing an old Adcom GFA-535II amplifier. I am replacing the power supply board with a Hoppe's Brain kit and am now working on the two main boards which each have several transistors that are screwed into heat sinks. I already disconnected to get the boards out and now...
  10. J

    Marantz 2215B Power Supply Transistor Subs

    Hi all, I am currently restoring a Marantz 2215b as my first restoration. I am working on the power amp and I am having trouble sourcing a suitable replacement transistor for H709 and H710. The originals were 2SA684 which folks have said to substitute with KSA1220AY. However KSA1220AY is out of...
    • J85t
    • Thread
    • 2215b 2sa684 ksa1220 main amplifier marantz obsolete p700 restoration substitute transistor
    • Replies: 9
    • Forum: Marantz Audio
  11. R

    SAE MARK XXXIB distorted channel, then loud buzzing.

    Hey what's going on? so when I play music through the amp the left channel is distorted the right channel is clear. when I moved the amp, both channels went completely distorted and I had to unplug it, loud buzzing through the speakers and buzzing around the bad darlington area. I pulled the...
    • robc23
    • Thread
    • 31b amp darlington help mark repair sae transistor xxxib
    • Replies: 30
    • Forum: Solid State
  12. mb21111

    Pioneer SX770 left channel preamp out hiss

    My SX770 has a hissing noise only heard on the preamp RCA out on the left channel. It is the same volume regardless of how loud the volume is turned, and is present regardless of which input is selected. Any idea which transistor may be the culprit? Everything else works perfectly.
    • mb21111
    • Thread
    • channel hiss left channel noise out pioneer pre out preamp sx770 transistor
    • Replies: 4
    • Forum: Solid State
  13. C

    Onkyo TX-4500 Transistor replacement

    Hi Folks, I just joined as I have a question about what modern equivalent to use in replacing a 2SC945 in my Onkyo TX-4500 (not MKII). This is for Q504 and the parts list in the service manual lists it as 2SC945(L, P). I have both the KSC1845FTA and KSC945CYTA on hand. My question: is one or...
  14. david winter

    Denon PMA-701 : 2SC1735 & 2SC1775 subs

    Hello, I'm going through a nice Denon PMA-701 amp. Seems a bit cheap in manufacture, but worth restoring. The tone control uses a number of 2SC1775 and 2SC1000. Haven't replaced any yet. The output stage also has a pair of 2SC1775 which I plan to replace by 2SC1845 unless there is a better...
  15. OFrank

    Marantz 2325 Transistor Substitutions.

    Hello Everyone, I need some help from all the Marantz guru’s. I have read in another post that the possible cause to an intermittent loud popping in the 2325 power amp might be the H706 - 2SA818 and H707 - 2SC1628 transistors. I see that the recommended replacement transistors are KSA1381for...
  16. Douk

    Rotel RB-2000 main transistors

    Hi! I am restoring a Rotel RB-2000 power amp by replacing all electrolytic capacitors. There is only on e question I have with regards the unit I am working on. I am not sure if the main transistors are original and I would like to restore it to its Original glory. What main transistors are...
    • Douk
    • Thread
    • poweramplifier rotel transistor
    • Replies: 3
    • Forum: Solid State
  17. R

    Sansui BA-3000 No Power

    Greetings everyone, I have a Sansui BA-3000 I bought with issues. I tested it and realized that the RL02 relay was not functioning and decided to replace both relays on the (F-2511) protection board. I then realized the cermet resistors (R01 and R02) were burned up. I replaced them and the new...
    • Rasmu004
    • Thread
    • ba 3000 ca3000 help no audio no lights no power protection relay sansui transistor
    • Replies: 4
    • Forum: Exclusively Sansui
  18. C

    Magnavox Astrosonic R222 Chassis

    Hi all, I recently acquired a Magnavox Astrosonic 1P3661 (chassis R22276 DE) from its original owner. It’s in great condition and is solid state. I was able to restore the W821 turntable with a tear down, relube, new stylus, and new idler wheel. I’m now focusing on the chassis. Overall sounds...
    • csimone
    • Thread
    • astro sonic capacitor chassis magnavox output capacitor restoration resistor transistor
    • Replies: 2
    • Forum: Solid State
  19. badwithnames

    Another Identifying Transistor Help Thread

    Hello all, I'll be doing a few restorations (SX-950, SX-880, SA-8800) in the near future and have been doing a lot of learning here on the AK forums. I've got a decent parts list going for all my projects but am having issues when it comes to what exactly I need to be replacing for...
  20. AshhBoy_

    dbx cx3-mkI faulty channel repair

    After having my cx3 fixed because of a dead right channel on arrival, I used it daily for about two years with mostly no issues. Two days ago, I fired it up to discover my right channel was presenting a large ac-synced humming noise. I quickly unplugged everything and checked all my wiring, to...
    • AshhBoy_
    • Thread
    • channel failure dbx dbx cx3 operational amplifier output board preamp repair transistor
    • Replies: 4
    • Forum: Solid State
  21. D

    Transistor replacement pioneer sx-3600

    I have a pioneer sx-3600 with a bad output transistor 2SD883A with the bat wings (xm20). I cant seem to find a replacement for it. I've checked with the local seller in my town and he couldent even find a suitable replacement and hes been doing it since the 70's. I've checked digikey & mouser...
  22. D

    Spec-2 Troubleshooting Output Transistors

    Looking for advice on determining if the output transistors are leading to a channel appearing to be out. What I've determined is that I have the correct voltage at 15,16,21,22, but do not see any voltage at the output legs of the transistors. I have taken each output transistor out and did a...
  23. Impact

    Realistic STA78 Resistor/Transistor fun

    Looks like il be adding to the fun as I am as well a STA78 owner that has crackling/popping out of only the left channel. After searching the forums, I put together that this is likely a bad transistor and decided to start doing a cold test of the transistors using super cold spray. During...
    • Impact
    • Thread
    • noise realistic resistor squealing transistor
    • Replies: 2
    • Forum: Solid State
  24. T

    nad c326bee integrated amplifier with defective pre amp circuit help?

    According to the previous owner it was working but suddenly they could hear pops from time to time via the speakers until one day there was a very loud pop and it stopped functioning properly. I tested it and it seems like the problem is limited to the pre amp as the power amp is working fine if...
  25. K

    Marantz 1090 Power Amp Transistor Replacement

    Hello, all. I have a 1090 on the bench that had a failure in the power amp driver board. It appears Q718 shorted from the base to the emitter. The transistors in the path current flowed all seem to be effected, though Q718 is the only one with a dead short. I'm going to replace all the effected...
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