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ta-4650

  1. jerdobi

    Restoring a vintage 50 year old Sony TA-5650 in 2026

    I wanted to say a big thank you to the entire audio community both on AudioKarma and YouTube for all the help and guidance in restoring my Sony TA-5650. As we all know, these amps are no small project—the output FETs are extremely difficult (if not impossible) to find and match properly. I...
    • jerdobi
    • Thread
    • sony sony ta-5650 ta-4650 ta-5650
    • Replies: 5
    • Forum: Solid State
  2. A

    Sony TA-4650 help needed

    Dear all, I inherited a TA-4650 from my dad which had been idle for around 15 years. I used it with great enjoyment for more or less a year before noticing one of the channels was sounding more silent than the other. The difference wasn’t huge, but it was perceptible. Given the reputation of...
  3. J

    Sony TA-4650 repair question

    Hi all I have a TA-4650 on my bench that according to the owner blew a fuse. When I received the amp I removed the v-fets and tested them, they all seem to be ok (see table below). With the v-fets removed I did some checks and noticed that the +20V and the +75V were both missing. After a lot of...
    • jvdk
    • Thread
    • sony ta-4650 v-fet
    • Replies: 2
    • Forum: Solid State
  4. T

    Sony ta-4650 inputs bleeding through?

    My ta-4650 has a weird thing where if you have an input going into any of the line level inputs (haven't tried it with phono yet) and you switch to either the tape monitor or any of the other channels the signal from the input will be audible even if you have the volume knob turned all the way...
  5. AlexHempel

    Sony TA-4650 VFET Amp Restoration

    Greetings all, I purchased a Sony TA-4650 VFET amplifier as a quarantine project and thought I'd start a thread to document my efforts. My Stax headphones go well with warmer, less-fatiguing amps and I left my Pioneer M-22 back in NYC, so this seemed like a good pick-up. Plus, I want to see if...
  6. PE9ZZ

    Replacing VFETs with MOSFETs

    Many people said it couldn't be done so I saw a challenge. On the Audiofreaks forum I documented (in Dutch) my efforts in getting a dud Sony TA-4650 going again without having to resort to tying to get unobtanium 2SJ18/2SK60 SIT transistors. I decided to use IRFP(9)240 instead. Of course the...
    • PE9ZZ
    • Thread
    • 2sj18 2sk1057 2sk60 bias irfp240 ltspice mosfet sony ta-4650 vfet
    • Replies: 79
    • Forum: Solid State
  7. ahess

    Sony TA-4650 Restoration

    I'm glad to be adding something to the forum after having followed so many posts! This is a restoration project for my first-ever audio purchase--a TA-4650 from an enlightened stereo person who brought me into the audiophile world when I was 16. There is a lot of love in this device...
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