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Pinörkel · 5th Sep 2020, 2:14 pm

Yesterday, my D755 did not switch on anymore. Turned out, the fuse had blown silently. Maybe this was caused by the recent defects in the PSU that I repaired. I found a Eaton & BUSSMANN TDC11 1A time delay fuse in it. Unfortunately I did not find a usable source for TDC11 1A fuses on the net, where one does not have to buy 1000 fuses minimum. Searching for good a replacement I noticed that all locally available time delay fuses had a very different arcing behavior in low over-current situations. While the TDC11 1A takes only 1 to 4 seconds to blow at 2A, the replacements I found can last from 100 seconds up to 10 minutes at that amperage. Now I am afraid that a fuse like this will not protect the scope reliably. However, I am not sure if the TDC11 was the original fuse to begin with. Maybe not and it is already too sensitive in the low amperage area to reliably survive the powering on phase of the scope. Has anyone some useful experiences to share on this?

5th Sep 2020, 2:14 pm	#120
Pinörkel Pentode Join Date: Jun 2019 Location: Dortmund, Germany Posts: 161	Re: Telequipment D75 scope. Yesterday, my D755 did not switch on anymore. Turned out, the fuse had blown silently. Maybe this was caused by the recent defects in the PSU that I repaired. I found a Eaton & BUSSMANN TDC11 1A time delay fuse in it. Unfortunately I did not find a usable source for TDC11 1A fuses on the net, where one does not have to buy 1000 fuses minimum. Searching for good a replacement I noticed that all locally available time delay fuses had a very different arcing behavior in low over-current situations. While the TDC11 1A takes only 1 to 4 seconds to blow at 2A, the replacements I found can last from 100 seconds up to 10 minutes at that amperage. Now I am afraid that a fuse like this will not protect the scope reliably. However, I am not sure if the TDC11 was the original fuse to begin with. Maybe not and it is already too sensitive in the low amperage area to reliably survive the powering on phase of the scope. Has anyone some useful experiences to share on this?