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diodes

  1. J

    Source for KA-6100 power rectifier diodes

    Good morning. I am rebuilding/repairing a KA-6100 Integrated Amplifier. I have replaced all of the electrolytic caps and verified that they are correctly oriented. When I switch on the power, I immediately blow fuses Fm2 and Fm4. I suspect from reading another thread that one or more of the...
  2. junkscience

    Question re: Marantz 8b high voltage power supply diodes

    Question regarding Marantz 8b high voltage power supply HV PSU diodes replacement I am restoring a Marantz 8b amplifier. It is a straight forward decision to replace the selenium rectifier. It seems that this would be the opportune time to also replace the high voltage power supply diodes...
    • junkscience
    • Thread
    • bias voltage diodes high voltage power supply marantz 8b rectifier selenium
    • Replies: 18
    • Forum: Tube Audio
  3. toymanmsp

    Help with Sansui 551

    Greetings all, I'm starting to post more on AK. It's fantastic that there are so many members that are willing to help newbies like myself. I've replaced all of the caps in the 551 with the exception of the tuner, which I will do once I've finished replacing the transistors (Pre-Power-phono) on...
  4. mrhandlin

    Hafler DH-500 - bridge rectifier? recommendations?

    Thanks in advance for your help. It's great to be part of a community of like-minded individuals. I've recently recapped an old Hafler DH-500. It's a bit unusual in that it has the pc10a version of the boards which don't quite match the manual available online. Anyhow, I've recapped it and...
    • mrhandlin
    • Thread
    • bridge rectifier dh-500 diodes fred type bridge rectifier hafler snubber
    • Replies: 11
    • Forum: Solid State
  5. klamsoss

    1060 rebuild on deck

    Good afternoon AKers! I've got a 1060 on deck for a rebuild. It hasn't been powered up in a couple years and the glue on the boards has corroded most of the caps pretty well. Nothing has been touched in the power supply since it was manufactured, so it's long overdue for some attention. I've...
    • klamsoss
    • Thread
    • 1060 capacitors diodes marantz marantz 1060 restoration
    • Replies: 43
    • Forum: Marantz Audio
  6. A

    Short and sweet. STV-4H diode request

    hello. I’m sorry for dual posting my introduction and diode request a week or so ago. I’m not trying to cause any extra work on my behalf. I’m sorrry. I did get a whole lot more of a welcome than I ever expected. Thank you guys for that. Are there any 4H diodes for sale anymore? Im thinking...
    • Ashe
    • Thread
    • diode diodes pioneer restore spec spec 2 stv-4h
    • Replies: 3
    • Forum: Pioneer Audio
  7. redpackman

    Pioneer SA-6700 Blowing fuses

    Got a "garage sale" SA-6700 today. Fuses blow as soon as the power is turned on. Checked the transformers, as best I could. Doesn't seem to be a dead short in either primary...around 3 ohms resistance. Then I checked the diodes (D21 thru D24) all GP-20D. All of them were open and failed the...
  8. JKBay

    Marantz 2220 complete rebuild

    I have a 2220 which I have just started to rebuild. Right off the bat it appears that the P-700 board had a catastrophic incident. (See burn out on R739) I know the 2220 is a low end unit but I want to completely resurrect it as part of my learning. I have removed a few parts and most are...
    • JKBay
    • Thread
    • 2220 2sc1030 black diodes catastrophic diodes marantz p-700
    • Replies: 8
    • Forum: Marantz Audio
  9. MBuras

    Pioneer A-80 clipping troubleshooting

    Been working on a basket case Pioneer A-80 for a while. One amp board and outputs were completely trashed. Replaced the obvious and then tracked down a few more severely out of tolerance resistors. That channel is working just fine and begins clipping at 223wpc using direct mode, 1000hz signal...
    • MBuras
    • Thread
    • 1980's a-80 diode diodes integrated pioneer
    • Replies: 5
    • Forum: Pioneer Audio
  10. MBuras

    Modern Sub for MV-1 Varistor?

    I'm in the middle of a Marantz 1122DC restoration and originally noted the amp boards were missing four of the MV-1 varistors listed in the service manual. Once I pulled the board apart I found them on the backside (why?), covered in clear shrink and nasty glue. Looks like they're black and...
    • MBuras
    • Thread
    • diodes epoxy mv-1 varistors
    • Replies: 2
    • Forum: Solid State
  11. macman007

    Marantz 1200 (Not B) Freshening Up...Consensus..

    Hello folks, getting ready to take my 1200 offline for some maintenance and tuning. Its been on the bench once for relay board caps and diodes back in '09, along with Deoxit and Faderlube, the normal stuff. Now on it's 46th birthday I'd like to do something special. Catrafter and I spoke and he...
    • macman007
    • Thread
    • 1200 capacitors diodes diy integrated amplifier marantz recap transistors upgrade
    • Replies: 2
    • Forum: Marantz Audio
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