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output

  1. P

    Vintage Denon amp output on 0 volume?

    Alright so apologies if this is not the correct place to post this as I'm yet to get my head around this site... I got my hands on a Denon PMA-320 integrated amp (circa 1989) today and have spent a couple of hours troubleshooting an unusual output issue: when the volume is at 0 there is still...
  2. 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...
  3. A

    Need Help Fixing the Output on a KA-8100

    Hi, In the middle of restoring my KA-8100 when discovered the right channel output is basically half of the left. I'm measuring the output over the audio spectrum (20-20k Hz). The source input is on the AUX input @0.150mV to both R&L. This results in good voltages on the pre out terminals...
  4. J

    MX113 Low Left Channel

    Hi all. Just finished replacing all of the important capacitors on my MX113. I did not change any transistors, I do not have experience diagnosing transistor issues. Working great with two caveats: - A low hiss on both channels. Happens on both Aux and Tape inputs, and both Main and Tape...
    • Jacope
    • Thread
    • dull hiss hum input left channel mcintosh mx113 output right channel
    • Replies: 2
    • Forum: McIntosh Audio
  5. mrcaps

    technics Sa 600 no sound to speakers. Getting output to everything else !! Newbie help

    Ive replaced the fuses on rear, cleaned the relay protect switch, inspected the 3 fuses inside visually look fine (not tested). Im getting output to headphones. Just nothing to speakers. Safety light is green, Im new to repair so any pointers would be very welcome. Many thanks.
    • mrcaps
    • Thread
    • no sound output speakers & amps technics sa 600
    • Replies: 2
    • Forum: Solid State
  6. FRANKPIETTE

    JVC JR-S401 Output Transistors Replacement

    Hello everyone, I have that JVC that the output transistors D736/B700 HPAK case. I looked for a replacement so far nothing or equivalent hard to find. Any help would be very appreciated. There's only 1 trimmer per side but 4 measuring points per side. I adjusted X723 idling current at 10mV...
    • FRANKPIETTE
    • Thread
    • jvc jr-s401 jvc jr-s401 output transistors output output transistors
    • Replies: 6
    • Forum: Solid State
  7. 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
  8. S

    Do the Yamaha CR-1020 and 2020 have the same output amps?

    Hi all, I feel kind of silly asking this but where comparing pictures the amp output assemblies and parts look identical. I have not been able to compare parts lists for these two and thought I would ask since a lot of parts are interchangeable on these.
    • SharkBait07
    • Thread
    • amp amplifier cr-1020 cr-2020 output yamaha
    • Replies: 8
    • Forum: Yamaha
  9. 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
  10. blenderhand

    Marantz 2220B output issues

    Hello! I have a 2220B and I’m having some issues with the output in the right channel. I looked through other similar posts and have switched out the output relay as suggested. It’s seemed fine but now it’s doing it again. It will get crackly and then eventually stop working all together. When I...
  11. BA3000

    Do I need a phono preamp?

    I have a Koetsu cartridge with an output of 0.4 Millivolts. My receiver is a Marantz 2275. My question is, do I need an additional phono preamp to accommodate the moving coil cartridge? I have been listening to my turntable with it connected directly to the Marantz receiver, with the only...
    • BA3000
    • Thread
    • cartridge koetsu marantz moving coil output phono preamp receiver stereo
    • Replies: 24
    • Forum: Turntables
  12. F

    Sansui 6060 - output transistor orientation

    Recently acquired a 6060 in a few pieces. This is the later version with the F-2701 amplifier board and vertical heatsink. Upon opening up the cabinet, all 4 output transistors (2SD188A & 2SB545A) plus a few other surprises were inside a ziploc bag. I do not have a schematic showing the F-2701...
  13. Carver 900 Receiver Output Pcb

    Carver 900 Receiver Output Pcb

    Carver MXR 900 Receiver --- 2 X .39 ohm mystery resistors on output relay pcb. R pair is not in manufacturers schematic. Relays had six lugs - replaced with 8 lug versions. Had crackling in left channel. Clear in headphones prior to fix. All is good now. (Fingers crossed)
    • Lou F Quincy
    • Media item
    • carver mxr 900 output receiver relay
    • Comments: 0
    • Category: Manufacturers Library
  14. Sergimm

    Strange output transistor setup on JVC 4VN-880

    I am attempting to clean an extra-dirty JVC 4VN-880 (was used in a bar for 30 years). When I looked at how would I remove the output transistors, I found something I’m not familiar with: On the opposite heatsink side that the transistor is, there is a strange connector composed by two...
    • Sergimm
    • Thread
    • 4vn-880 grease jvc output transistor
    • Replies: 7
    • Forum: Solid State
  15. Sergimm

    Choosing an ouput pair

    I'm restoring a Luxman L1 (thread), and I want to replace the current output transistors, which are not original. I am far from understanding all that's implied on pairing these kind of transistors, so I've made a list of potential replacements: 2SA1135/2SC2665 (Original as specified on the SM)...
  16. mauser

    Help troubleshooting a Sherwood S-9910

    Hello all, I am new at troubleshooting electronics, and am hoping for some help and direction from those more knowledgeable than myself. I was given this vintage Sherwood with a sound output problem, this is what I know so far: Visual inspection shows nothing significant of concern, some dust...
    • mauser
    • Thread
    • 9910 monster output sherwood transistor vintage
    • Replies: 2
    • Forum: Solid State
  17. SamfoxR

    Technics SL-V5 Output issue

    Hi the AK community , i'm joining you with a really good Technics SL-V5 , in an amazing condition. But once arrived at home, after setting it ; just realised that the Right Channel Output is weak. The Left one is amazing, by the way. I tried to find the manual to follow some instructions in a...
    • SamfoxR
    • Thread
    • channel issue output technics sl-v5
    • Replies: 3
    • Forum: Turntables
  18. richardg0n

    Marantz 2325 Left Channel Pre Has No Output

    Hi Guys, I recapped the pre-amp board (PE01) on my 2325 and am not getting any output on the left channel. I am running a sine wave from an audio generator into the AUX RCA inputs and am monitoring through the headphones and Tektronix 465. I am only getting output on the right channel in the...
  19. david winter

    1060 - Can't get half voltage at output caps

    Hi, I have done this model more than once and don't understand the problem. It's fully recaped as usual with Nichicon / Elna. I replaced all 2SC458/1000 on the phono stage, as well as both 2SD438 on the output board (the two new ones I have in stock have a gain of 152-155 so no idea if this is...
  20. Type IV Tape

    My Pioneer SX-780 just caught Mono

    THE INCIDENT I was listening to XM Radio over the AUX input when I heard the audio fluctuate. I thought maybe there had been a power spike (despite being plugged into a surge protector). Suddenly the right channel became very weak and garbled. Occasionally it would break back through to full...
    • Type IV Tape
    • Thread
    • channel dead mono output pioneer reciever right seperation stereo sx-780
    • Replies: 18
    • Forum: Pioneer Audio
  21. david winter

    Harman Kardon HK 450 transistor subs

    Hi, I wondered what typical subs should be used in place of those old transistors with roten legs of the same family as the well known 2SC458 (well known for causing problems). Phono section: Q701, Q702: 2SC1775(F) Q703, Q704: 2SA872(E) Q706, Q707: 2SC1775(F) Eq sections: Q501-Q504...
  22. 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...
  23. A

    68 Magnavox AstroSonic Bias Help

    I have an 68 astrosnic console chassis number: R220-02-BA My amplifier has a unique silicon npn/germanium pnp output stage pictured below. Unfortunately, my germanium is leaking on my left channel and subsequently, the output power is very low. The old transistors are bandix 111p1 and the...
  24. vinylisfinyl

    Realistic STA-78 with high voltage on left channel output

    Greetings, fellow stereo curators! I need some assistance from you today regarding high DC voltage on the left channel in our beloved STA-78 receiver. Dad bought it new in the late 70s and passed it on to me, but when he tried using it this summer in our garage it let out the magic smoke after...
    • vinylisfinyl
    • Thread
    • channel high dc offset high voltage output realistic speaker sta 78 sta-78 sta78
    • Replies: 39
    • Forum: Solid State
  25. U

    Help with chromecast and Sansui 9090

    Hello, I recently purchased a Sansui 9090 and will be streaming Spotify via Chromecast from my iPhone/Laptop. My question has to do with phone volume vs. Sansui volume knob. If my phone volume output is say, 50%, I can obviously turn up the Sansui volume knob to compensate. If my phone volume...
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