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mark iv

  1. jpreza

    Project One MARK IV B - FM Muting question?

    Good afternoon everyone, I finally brought back to life a Project/One MARK IV B Receiver that I bought last year. The original owner had disclosed that the R channel appeared to be going out. I worked on it for a while and after not able to figure out what was wrong I set it aside for a few...
  2. U

    Project/One Mark IV protection

    I've come across a strange one. When the unit came in for repairs, one channel had shorted outputs. I replaced the outputs and found a weak coupling capacitor and the unit fired up. I had it on a Dim Bulb Tester, thankfully, since 30 secs after firing up, it thumped, the bulb lit up and the...
  3. Fasturd

    Pair of Dynaco Mark IV buzz. SOLVED

    New to the Dynaco world. My new to me Mark IV amps have an identical buzz that is too loud to ignore. They were partially updated prior to my ownership and did not buzz at the sellers home. I do not know the make of the boards yet but they are currently running 1 Sylvania 6GH8A on each board...
    • Fasturd
    • Thread
    • 120hz 60hz 6gh8 buzz dynaco mark iv problem solved
    • Replies: 69
    • Forum: Tube Audio
  4. Johnny_Law

    SAE Mark IV DM Amplifier Manual / Schematic?

    I'd love to find a schematic / service manual for my Mark IV DM ... It seems the sources of this are now gone. SAE Talk Yahoo group (https://groups.yahoo.com/neo/groups/SAE_Talk/info) I've requested to join, but heard nothing back ... Jims SAE Site, now gone, you can see what it used to look...
  5. gdmoore28

    Help Identifying a Tube Amp

    The short backstory: My old WWII electrician friend recently passed away. He was the only other person in our small southern town who was a fellow audio enthusiast. Before he died, he sold me all of his NOS Altec and University speaker components. Last week, I finally received his two tube amps...
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