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Old 4th May 2009, 01:36 AM   #1
00940 is offline 00940  Belgium
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Default Crazy issues with an Heathkit oscilloscope

I was given an old IO-12 oscilloscope by Heathkit. It seemed to work but :

- The crazy thing runs at 400 to 1500 VDC (tube oscilloscope) and comes... with a two prongs main plug. Checking inside, the enclosure isn't connected to anything anywhere either.

- They used a rotary on-off switch integrated onto a potentiometer as power switch, to switch thus 220VAC. After powering the unit a few times, it started to create crazy sparks at start up to finally end up in fire (tripping my home fuses of course).

What should I do ?

- Strip it for parts ? It has a nice transformer, plenty of switches, some good tubes, etc..
- Try to make it safe ? I'd have to replace the power cord, find a way to earth it, replace the power switch, replace some old electrolytic caps.
- Sell it on ebay for spares ?
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Old 4th May 2009, 03:24 AM   #2
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Making any Heathkit scope safe is a chore. A lot had bum transformers, leaky caps and junk switches.

IMO, fleabay it.

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Old 5th May 2009, 11:47 PM   #3
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I'd say sell it on ebay, inform the buyers of its problems and let someone else have the fun of restoring it. I used to have one, and aside from a horizontal amplitude problem (I didn't know anything at the time) it was OK. Certainly didn't have any sparks and it well assembled. Looked great too. too bad I trashed it. I hate myself for that.

Sell it on ebay. or should I say "fleabay" like geek! lol
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