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opamp

  1. sae-7125

    TL072CP lifespan (apt holman preamp)

    anyone happen to know if the tl072cp has a particular service lifespan out in the wild? currently have an apt holman preamp exhibiting some rather odd tone control and bass mode amplitude+phase issues when comparing left vs right channel output (tone generator as source). preamp was recapped...
    • sae-7125
    • Thread
    • apt holman no ventilation opa2134pa opamp phase issue rc4558p relay issue tl072cp tone control
    • Replies: 20
    • Forum: General Audio Discussion
  2. C

    Opamp for Phono Preamp

    Hello, I'm a new member in this forum. I have an pcb from fosi audio tube phono. The sound is ok, but i wonder if i can improve the sound by replace the opamp ? The current opamp is JRC2068 and i have an unused OPA2134, can this be used here ? I don't have a schematic, but just a photo. Thank...
    • cayman711
    • Thread
    • opamp phono board
    • Replies: 11
    • Forum: DIY
  3. KinoRodori

    Need help on opamp replacement

    Hi guys! I'm still a novice to DIY maintenance, repair and mods on hifi equipment. I am confident with my soldering skills but I'm a little short on circuit wisdom. I have a TA-F222ESA (TA-F570ES in the west) that I recently repaired and it is working well. However its shortcoming is the...
    • KinoRodori
    • Thread
    • diy mods novice opa2134 opamp sony 570es sonyes
    • Replies: 22
    • Forum: DIY
  4. KinoRodori

    Need help identifying the audio path

    Hi all, I'm a budding DIYer and I need help identifying the audio path in this schematic I have. I want to understand what parts touch the audio. :music: I plan to do a recap soon and I know many would say it's not necessary as long as it works, but i for one like the peace of mind especially...
    • KinoRodori
    • Thread
    • lm4562 noob opa2134 opamp recap recap list request schematic sony sony 570es sony es
    • Replies: 4
    • Forum: DIY
  5. PE9ZZ

    Measure trigger voltage DC protection circuit of SU-V85A amp

    I just fixed a Technics SU-V85A which had a bad VAS transistor Q401. The result was that the "voltage amp" railed and the "current amp" tried to counteract this. Because of the former's current limit circuit it even succeeded. After fixing the fault I wondered why the speaker relay came in...
    • PE9ZZ
    • Thread
    • an7073 dc protection circuit opamp su-v85a technics
    • Replies: 0
    • Forum: Solid State
  6. tusntuk2

    Which OpAmp for Kenwood KT-7500 tuner mod?

    There have been a couple of great threads about modding the KT-7500 to improve the sound. I'm not looking for the FM tuner mods to the filters and such, just looking to improve the sound. I've done several Kenwood restorations now, and the last success (KA-7100 - wow!) has prompted me to try...
  7. ExcitableOne

    So my brand new JVC RX-517v from Goodwill is having a few issues...

    Now to start this off, I don't even know if this is the right place to put this since my JVC isn't exactly "vintage". It's from 1993 and actually looks newer, so I honestly don't know. Second, I'm new here...as you can probably tell. Alright, now on to my problem. So a while ago my poor JVC was...
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