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Egnator 40

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  • Egnator 40

    I have one that blew a mains fuse & after replacing it, blew the one on the plug. I’ve read that these have power transformer problems. How do i check the transformer to know whether it’s bad?

  • #2
    Do you have a light bulb limiter? If not, now's a good time to build one. I'd first pull the tubes and fire it up on a LBL. It could just be shorted/bad tubes. If you suspect the transformer, unhook the secondaries and fire it up with only the primary hooked up. Does the LBL go bright or does the fuse blow again?
    "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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    • #3
      The question to ask is how do I find WHERE the problem is.
      Education is what you're left with after you have forgotten what you have learned.

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      • #4
        I tested the tubes in my BK tester. Power tubes were fine, but the 3 ax7s were weak. I replaced the blown plug fuse, detached all of the secondary wires, pulled all tubes, plugged into 8 ohm speaker & powered on & was happy to see that it didn’t blow any fuses. Was this the correct procedure to determine whether the PT is bad?

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        • #5
          I put the tubes in, replaced the ax7’s & started it up on my variac with current meter. The current rose quickly at as I slowly raised the voltage so I powered down. How do I find where the problem is from here?

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          • #6
            Well, if you unhooked all of the PT secondaries, it doesn't matter if there's a speaker, tubes, or anything else. The amp is not powered. If the fuse held, I'd next check those secondaries to see if you have ACV there. You should, but verify. Be careful not to electrocute yourself!
            "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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            • #7
              [QUOTE=The Dude;551475]Well, if you unhooked all of the PT secondaries, it doesn't matter if there's a speaker, tubes, or anything else. The amp is not powered. If the fuse held, I'd next check those secondaries to see if you have ACV there. You should, but verify. Be careful not to electrocute yourself![/QUOTE

              Check AC on each of the secondaries with the tubes out and the secondary wires pulled?

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              • #8
                Yes just the secondary wires hanging there unhooked from the amp. Then check for voltage coming out of the tranformer (wires). We are only testing the transformer- not the amp. Tubes in or out- it doesn't matter.
                "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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                • #9
                  Originally posted by The Dude View Post
                  Yes just the secondary wires hanging there unhooked from the amp. Then check for voltage coming out of the tranformer (wires). We are only testing the transformer- not the amp. Tubes in or out- it doesn't matter.

                  What do you mean "voltage coming out of the transformer? Isn't that the ACV I'm checking the 2o's for? Or do you mean another set of wires?

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                  • #10
                    Originally posted by Perkinsman View Post
                    ......Isn't that the ACV I'm checking the 2o's for?......
                    I'm not sure what that means? But, yes check ACV out of transformer with secondary unhooked.
                    "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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                    • #11
                      Originally posted by The Dude View Post
                      I'm not sure what that means? But, yes check ACV out of transformer with secondary unhooked.
                      I think I misunderstood your message. I'll measure the 6 secondaries (2o's) & report back.

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                      • #12
                        What do you mean by 2o's? Not come across that term before.

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                        • #13
                          Originally posted by Mick Bailey View Post
                          What do you mean by 2o's? Not come across that term before.
                          It's a new one on me too. 2o's = secondaries

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                          • #14
                            I'll measure the 6 secondaries (2o's) & report back.
                            And pay attention to measure between the corresponding wires of each secondary and not wrt to ground/chassis.
                            - Own Opinions Only -

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                            • #15
                              [QUOTE=Helmholtz;551518]And pay attention to measure between the corresponding wires of each secondary and not wrt to ground/chassis.[/QUOT

                              You mean measure ACV green to green, red to red & yellow to yellow?

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