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transistor

  1. Racingh11

    TO3 MOSFET - end of life

    I just went to get some new TO3 output transistors from ProFusion / Exicon, and they are now marked as 'end-of-life'. Better get them while they last. Does anyone know of any other TO3 lateral MOSFET transistors out there that are made by reputable companies...
    • Racingh11
    • Thread
    • exicon mosfet obsolete output profusion transistor
    • Replies: 2
    • Forum: Solid State
  2. James Cox

    Sherwood s-7900 with a dead right channel

    So I picked up a Sherwood s-7900 in beautiful cosmetic condition. Actually I picked up an entire carload of gear and after getting a pioneer sx-3700 and sx-780 sorted out(for the most part, still waiting on some final parts to fix a problem with the phono stage) and ordering some parts for the 2...
    • James Cox
    • Thread
    • dead channel diy repair s-7900 sherwood solid state transistor
    • Replies: 4
    • Forum: Solid State
  3. J

    DISTORTION BOTH CHANNELS NAD MODEL 200

    First of all I wanted to thank the work done by all the members of the website, it really is very helpful for people like me who are just starting out in this world. I hope someone can help me with my model 200 NAD amplifier. The amplifier has distortion in the two channels, I changed 3...
    • Joan Biel
    • Thread
    • 2sd438 distortion nad repair restoration transistor
    • Replies: 3
    • Forum: Solid State
  4. Mrcoolest123

    Pioneer Transistor replacement

    hello! I just got a new piece of gear for my collection, a pioneer sa-710. Got for a nice price because the seller told me it didn't work and wasn't able to repair it. I have some knowledge on electronics so I took it as my project to repair it. I already found the replacements for the burn...
    • Mrcoolest123
    • Thread
    • help pioneer pioneer sa 710 transistor transistor equivalent
    • Replies: 2
    • Forum: Solid State
  5. Mat86

    Replacing a power transistor?

    So I'm trying to restore a Pioneer RG-2 processor, despite being a novice, and picked up a broken unit. Fiddling around inside I found a power transistor to be rather loose, and applying pressure would bring the unit back to life. The part is Q32 in the service manual, appears to be a...
    • Mat86
    • Thread
    • pioneer rg-2 transistor
    • Replies: 17
    • Forum: DIY
  6. EnzoFerenzo

    marantz 2238b power main board transistor

    I am looking for a suitable replacement for the thermally coupled transistors, in particular Q708, part number listed in the manual is:HT315672BO. I've looked online, and it seems like an old, obsolete part. Any help getting a substitute is appreciated. I've included below part of another thread...
  7. grandpaslab

    Rotel RX-803 - 2SA912 sub?

    I'm trying to eliminate the last few gremlins in this Rotel. It crackles a bit and I've read that KSA912 gets noisy (and hot) so I'd like to replace Q605 and Q606 on the main amp board, which are listed as "main amp bias compensator". KSA1013 seems to be the go-to sub, but I don't have any on...
  8. R

    Sansui driver transistor alternative

    Friends, I wonder if I can ask for some help. I'm repairing a Sansui 310. Have replaced blown power transistors (2SC1061 replaced with MJE15034G). There was also a blown driver transistor - one of two 2SA678s (TR 807 & 808) - which I replaced with some 2SA1015Ys, noting the different pinout...
    • Rhod
    • Thread
    • 2sa678 310 replacement sansui transistor
    • Replies: 35
    • Forum: Solid State
  9. VonKuhn

    Kenwood KR-7600 transistor problems

    Hello, after weeks of searching I am finally desperate enough to post a question and look for help. Recently I got a Kenwood kr-7600 in great condition to repair, just a bit dusty, and no sound at all. After some searching, I found a transistor (2SC1419 NPN) surrounded by dark spots on the board...
  10. Sergimm

    Transistor substitution Braun Regie 350

    Hi, I want to replace transistors 2SC1061 and 2SC1162 in a Braun Regie 350. These are the subs I'm considering: 2SC1061 -> MJE15034G 2SC1162 -> KSD794AYSTU I'm confident that the MJE15034G is a good sub, but I have no idea about the KSD794. It all seems fine, but the ft is way off. Then...
  11. L

    Brand of TO-3 transistors?

    Anyone have any options on Audio Power transistors! I know they are an off brand! But are substantially cheaper! I am retired and on a budget! The Toshiba claim to be original, genuine, but they look different from my original ones! At least the printing on them! Maybe a later production?? The...
  12. zombiemodern

    SL-1200 MK1 Woes (Negative Voltage at TR-14 collector)

    Hi AK, Was wondering if anyone here could help with an SL-1200mk1 that's seeing speed irregularity, particularly on power cycles. This is now a DIY project — a third turntable I don't really need but due to the rarity I'd love for it to operate properly. I've taken this to a local tech figuring...
    • zombiemodern
    • Thread
    • direct drive help mk1 recap repair sl-1200 sl-1200 mk1 technics transistor
    • Replies: 17
    • Forum: Turntables
  13. Racingh11

    OnSemi ThermalTrak power transistors

    OnSemi finally did what so many have suggested and put a matched bias diode junction in the same case as the output transistor. They call them ThermalTrak and is a 5-pin TO-264 case. No more bias lag issues. I will have to try these out. Datasheet attached.
    • Racingh11
    • Thread
    • bias onsemi output temperature thermaltrak tracking transistor
    • Replies: 10
    • Forum: Solid State
  14. I

    Philips GA-212 Turntable Suspect Transistors and Replacements

    I am going to be refurbishing a Philips GA-212 turntable I picked up recently and I am making a list of parts to acquire. Right off the bat I will be be replacing the two axial capacitors along with the light bulbs as it seems that the capacitive button circuit and auto stop requires them to...
  15. ImNeuman

    Replacements for 2sc650 and 2sc281

    Hello, I'm looking for modern alternatives for a 2sc650 and 2sc281. I cannot find any information online, and I feel like having people's input could help push me in the right direction. They are used in the amplifier board of a Roberts X1740, which is equivalent to the Akai X-150d. Any input...
  16. A

    Radio - noise on audio amplifier

    Hello everybody! I was given as a gift an old stationary radio made in Romania. Aesthetic it looks good for its age. I switched it on but it was heard only a noise and very weak sound. Both potentiometers for tone and volume were broken. There is a liniar design and I used one of those that I...
    • andreidaniel
    • Thread
    • audio amplifier noise radio transistor
    • Replies: 0
    • Forum: Tuners
  17. H

    C4 preamplifier dc fluctuation

    My C4 is sounding great but despite replacing the trimpots with Bourns the dc fluctuates quite energetically between -170mV and +180mV. Occasionally it will even stray further by another 100 or 200mV. Thoroughly checked all solder joins, switches cleaned etc. My question: are there any...
    • Hifibythekg
    • Thread
    • c-4 capacitor dc current preamplfier transistor yamaha
    • Replies: 24
    • Forum: Yamaha
  18. JB8

    Yamaha CR-620 - Right Channel Popcorn Static

    Acquired a CR-620, my first after a series of 400's and 420's, fun to get to know a new model! This particular unit had a bad output transistor, blowing the main fuse, so I upgraded/replaced all 4 with MJ21193G's and MJ21194G's, which solved the problem, but now I have persisting popcorn static...
    • JB8
    • Thread
    • cr-620 static in right channel transistor yamaha
    • Replies: 19
    • Forum: Yamaha
  19. xchg.ca

    Are any of these transistors have to be replaced? ( HK CD401 )

    Hi guys, this is a list of transistor I have in HK CD-401 deck It suffers from low record/playback level I have found and replaced leaked caps ( 10mFx16V and 1mFx50V ) I also found that 2x2SC2878(B) in rec-mute circuit were partially opened all the time regardless of button ( at the moment they...
    • xchg.ca
    • Thread
    • cd-401 cd401 harman kardon hk low level repair transistor
    • Replies: 6
    • Forum: DIY
  20. zastin17

    Sansui Au-666 Error on Schematic PNP Driver/Output Transistors. "Correctly Drawn/Fixed"

    So I noticed an error on the AU-666 while tracing all my wires back throughout the entire amp. Based on evidence left behind, this was probably a revision Sansui never fully finished in the manual. They show the collector of the "TR813" 2SA537 driver transistor going to Pin 8 on the Driver PCB...
  21. mhz

    Marantz 2238 Transistor Replacement

    Hello! I am new to AK but have been around quite a bit and have to thank everyone for all the great information here which has helped me a ton. I recently picked up a Marantz 2238 (non-B) in need of some care from a local record store. Don't think it has ever been serviced before; lamps were...
    • mhz
    • Thread
    • 2238 marantz restoration help transistor transistor replacement
    • Replies: 5
    • Forum: Marantz Audio
  22. allanmatters

    Technics st-c04 digital display not turning on

    I will begin by saying I shorted something in the board myself as I was trying to find a way to cool down the D880 transistor. Let me explain: the tuner was working prior to this. The only issue with it was that it would run for an hour or so until the d880 transistor would get really hot...
    • allanmatters
    • Thread
    • dead digital display technics transistor tuner
    • Replies: 23
    • Forum: Tuners
  23. Beavs

    Kenwood Eleven III Transistor Sub

    Have a Model Eleven III that needed a good cleaning and re-lamp and seemed to be working great on the bench. After getting it all put together letting it play for a few hours, loud distortion would start to develop intermittently regardless of source. I'm making the assumption that transistors...
  24. 4ever7

    NAD 3155 Transistor choices

    Hello AK members In the process of doing some work on my NAD 3155 and looking to the community to see what transistors I can use and what I have chosen is a good choice: i) Q903, Q905: 2SA1246 => ??? ii) Q902, Q904: 2SB548 => KSA1220AY iii) Q901: 2SD414 => KSB546Y Schematic of the section...
    • 4ever7
    • Thread
    • 2sa1246 2sb548 2sd414 3155 nad transistor
    • Replies: 0
    • Forum: Solid State
  25. VintageDutch

    Sony SQR 6650 Power amp problems, need advice.

    Hi guy's Some might have read about it ... if not no problem... I restored a nicotine "Rich" Sony SQR 6650 It needed maximum cleaning, Full recapping, and and and and... I was happily test driving this super sounding receiver in 4 quadro mode.. up till (after four days of problem free playing)...
    • VintageDutch
    • Thread
    • help replacement sony sony sqr-6650 sqr-6650 transistor
    • Replies: 1
    • Forum: Solid State
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