1.     Don't be a dotard!
    Read these "rules" AND introduce
    yourself     before your first post
  2. A healthy approach to understanding measurements
    Being true to what the artists intended
  3. After being asked for the 308th time, Merv lists top 5 headphones
    (opinion / entertainment piece)
    Dismiss Notice
  4. $1000 to the first to design a headamp using discrete components with better measurements than Magni 3+
    Dismiss Notice
IMPORTANT: New Members Read This Don't Be a Measurement Fascist Merv's Top 5 Headphones - 2023 Edition $1000 Challenge

Search Results

Search Again
Page 1 of 2
  1. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    This is the thing with vintage amps and boards especially class a, boards are fragile, solder joints need reflowing etc. Just to make sure i went...
    Post by: Vishal, Jul 10, 2020 in forum: Power Amps
  2. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    I wasn't too sure myself but that's where my issue was coming from, something ksut wasn't right in that specific area, whether this was due to...
    Post by: Vishal, Jul 9, 2020 in forum: Power Amps
  3. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    @PTS all original output transistors from factory! If you can find some original transistors that would be great, the same transistors were used...
    Post by: Vishal, Jul 9, 2020 in forum: Power Amps
  4. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    Again correct, once I did this my amp actually ran cooler!
    Post by: Vishal, Jul 3, 2020 in forum: Power Amps
  5. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    Also look at the picture of the traces, zoom in and if you know what you are looking for you can see where the traces are bad, if you were to...
    Post by: Vishal, Jul 3, 2020 in forum: Power Amps
  6. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    You are correct about this protection circuit and its not improbable about the issue I had. It just a process of elimination and I've come across...
    Post by: Vishal, Jul 3, 2020 in forum: Power Amps
  7. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    [img] One other issue I had come up was a very strange buzzing coming from the transformer, it just felt a little loud and like it was...
    Post by: Vishal, Jul 3, 2020 in forum: Power Amps
  8. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    Well that was helpful. If anyone has a temp gun or the ability to measure temperature could you please measure your hestsinks let me know what...
    Post by: Vishal, Jun 15, 2020 in forum: Power Amps
  9. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    I've read through this before and it's not very helpful for actually setting up the bias. Has anyone on here actually taken temp readings based...
    Post by: Vishal, Jun 14, 2020 in forum: Power Amps
  10. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    Guys what bias have you set yours to? Service manual says 850mv but I feel that's too much, my heatsink temp went to 74 degrees on idle! Has...
    Post by: Vishal, Jun 14, 2020 in forum: Power Amps
  11. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    Decided while inside the amp I would add cooling fans, got some 40x40x10mm 12v fans which fit perfectly inside the heatsink under the circuit...
    Post by: Vishal, Jun 14, 2020 in forum: Power Amps
  12. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    One thing to worry about is shorting against the relays and the AC mains connections. Decided to 3D print some covers: [img] [img] didn't have...
    Post by: Vishal, Jun 10, 2020 in forum: Power Amps
  13. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    Lets install new rca connectors and speaker posts [img] Pull out and drill old rca out [img] [img] [img] [img] [img] Bus bar original...
    Post by: Vishal, Jun 10, 2020 in forum: Power Amps
  14. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    https://imgur.com/a/qILrnu6 Had to match the hfe closely then make sure they were thermally bonded to each other. A992 transistor.
    Post by: Vishal, Jun 8, 2020 in forum: Power Amps
  15. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    hahaha because 3d printed holders wasn't good enough already? Access to a cnc lathe/milling machine is limited presently. Maybe in the future, at...
    Post by: Vishal, Jun 7, 2020 in forum: Power Amps
  16. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    You know what the heat sinks and metal work just needed so much work I just went all out and resprayed the whole thing. Anything black was...
    Post by: Vishal, Jun 7, 2020 in forum: Power Amps
  17. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    Just touching up scratches where you see metal, not doing a complete respray so it's not really needed.
    Post by: Vishal, Jun 6, 2020 in forum: Power Amps
  18. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    decades of dirt [IMG] [IMG] nice and clean now [ATTACH] [IMG] new rca connectors fit a treat also replacing the speaker binding posts with...
    Post by: Vishal, Jun 6, 2020 in forum: Power Amps
  19. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    Thanks for the help guys! Sarcasm, ordered new relays which did the trick and she's purring away without any issues. [img] [img] [img] [img]
    Post by: Vishal, Jun 5, 2020 in forum: Power Amps
  20. Vishal
    Post

    Pioneer M-22 Power Amp - Epic Japanese Gear From the Past

    Guys just my luck, so the amp was fired up this evening everything is as it should be, the only issue I have is that the output relays aren't...
    Post by: Vishal, Jun 2, 2020 in forum: Power Amps
Showing results 1 to 20 of 24 Next >
Search Again
Page 1 of 2