boom3 Posted October 22, 2023 Share Posted October 22, 2023 I have a Tektronix 502A scope, all tubes. A battleship of its day. It still works fine except for one little issue. The front panel is 60 v above ground. I am not equipped to work on tube gear. Anyone have an idea how this is a happening? I have the tech manual for it. TIA! 1 Quote Link to comment Share on other sites More sharing options...
JJkizak Posted October 22, 2023 Share Posted October 22, 2023 42 minutes ago, boom3 said: I have a Tektronix 502A scope, all tubes. A battleship of its day. It still works fine except for one little issue. The front panel is 60 v above ground. I am not equipped to work on tube gear. Anyone have an idea how this is a happening? I have the tech manual for it. TIA! I loved those scopes and they were built like a battleship. I would start with the power supply area. JJK Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted October 26, 2023 Share Posted October 26, 2023 I don't have an answer for you except to point you to this game changer. A 12 bit 2 channel for under $300.00 Rigol DHO802 https://www.ebay.com/itm/175959091278?hash=item28f7faa84e:g:ITAAAOSwSwhlJ~zE&amdata=enc%3AAQAIAAAA4HTlF%2Fd9zzPDdwvplEarJts5EY4UZjmCjOB%2F7MK%2Bo4ndM7%2FaePEKnHoSMF7szeHipys7rzUNzcORMiU2AHnSu1x2yLdBv7gsC3gj7l%2Bk%2BhqCdGPe8xLjXgvaZkSKYfQbFwfHiojWU7xlQs8BmtGplmQOCEAj9HnsCBv4OfHKRAQkHvHPo7sLNhOLBYKPS6%2BgPRHX%2Fsjj2O0hfo6TtDCdH1nusWg8Z2xCaDI9BCuO5O1%2BGj%2B8Pq0MSrjn2tH%2FVz%2B1ugttbUhu4h4yRGRT66fzvfFDwWOEd3ohTrZsLvJJSDNx|tkp%3ABk9SR9LqhdvtYg 70MHz, 1.25GSa/s, 2 channels 2 channels / 70MHz bandwidth 12-bit resolution 7" (1024 x 600) capacitive multi-touch screen Small footprint - only 10.5"W x 6.4"H x 3.1"D VESA mounting pattern on rear (100x100) Digital phosphor display with real-time 256-level intensity grading USB Device and Host, LAN, and HDMI interfaces Real-time sample rate up to 1.25 GSa/s Memory depth up to 25 Mpts Capture rate up to 1,000,000 wfms/s Quote Link to comment Share on other sites More sharing options...
the real Duke Spinner Posted October 27, 2023 Share Posted October 27, 2023 On 10/22/2023 at 2:24 PM, boom3 said: I have a Tektronix 502A scope, all tubes. A battleship of its day. It still works fine except for one little issue. The front panel is 60 v above ground. I am not equipped to work on tube gear. Anyone have an idea how this is a happening? I have the tech manual for it. TIA! I have several. 🙂 You have a leaking/ failed cap in the power supply Quote Link to comment Share on other sites More sharing options...
boom3 Posted October 30, 2023 Author Share Posted October 30, 2023 JL you are spot on, except...I'd like to keep the Tek going (if it's safe). I rarely need a scope these days but looking to retirement I'd like to keep the Tek available without concerns. If I had a '63 Lincoln (and I wish I did) I'd pay for a brake job if it needed it. Quote Link to comment Share on other sites More sharing options...
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