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heatsink

  1. hpmachining

    Dummy Load Heatsink

    I have some leftover 2-1/4" square 6061 aluminum and thought it would be good to make a couple of heatsinks for dummy loads. How does my design look? According to my CAD, I have ~.125m^2 of total surface area. I plan on using these resistors and fans. I figure I can connect the 2 blocks in...
    • hpmachining
    • Thread
    • dummy load heatsink
    • Replies: 21
    • Forum: DIY
  2. D

    MC2200 power transistors: which ones need insulators?

    Hi all, I have an MC2200 that recently had the right channel fail. I'm in the process of rebuilding the power section and have a few questions. Here's the rundown: 1. It is obvious this amp has been serviced before, as the transistors have date codes from 1976, 1979, 1992, and 1993. So...
  3. Swaler61

    Kenwood KR-4140 Work Observations

    Hey all, I'm working on a new to me Kenwood KR-4140, and it is in overall pretty good shape, and so far works pretty well and really liking the tone! For background, I'm a career EE, but haven't worked on a lot of old solid state circuitry, as I'm more of a guitar amp and old radio guy. Some...
  4. bzenic

    SX-650: Upgrade heatsinks on Amp2 D313?

    Although everything works on my SX-650 I noticed that two D313 on Amp2 board are running very hot. I'm curious if anybody tried to replace their original with bigger or better heat sinks? Additional problem is that there is no too much space around for expansion. It would be nice to make those...
  5. merlynski

    STVs and heatsink compound Question

    I am in the middle of rebuilding the power amp in my SX-1050 and I added some heatsink compound between the STV and the heatsinks for the drivers. I will do so on the main heatsink STVs as well. I have not seen it mentioned in any threads, though I think I have seen a few times it was done in...
  6. PROJECT 2501

    Does a high DC offset cause excessive heat?

    Marantz model 32 amplifier. DC offset of 89mv on the right channel and noticeably higher heat radiating from the right heatsink. Any correlation? Red flag?
    • PROJECT 2501
    • Thread
    • amplifier design dc offset heatsink marantz marantz amplifier troubleshooting
    • Replies: 11
    • Forum: Solid State
  7. dlucy

    How to apply thermal compound to TO-3 mica insulators

    I've read a few of the threads here on AK on which thermal compound to use and how to apply it when replacing TO-3 transistors. I'm replacing all the output transistors in a vintage Kenwood KR-6140A quadrophonic receiver, so I'm doing this thermal compound on a mica insulator for the first time...
    • dlucy
    • Thread
    • heatsink mica insulator thermal compound to-3 transistor replacement
    • Replies: 12
    • Forum: Solid State
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