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Test Equipment Anonymous (TEA) group therapy thread

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mnementh:

--- Quote from: bd139 on May 25, 2018, 12:01:57 pm ---Ok regulators are shot, caps are shot, half the diodes are shot in the power supply.

So I bypassed the power supply, which is neatly possible due to two links on the board, and chucked a bench power supply on it.

And you know what? It only still works perfectly. I am extremely surprised!

It pulls a monster current of 40mA per rail and the supply appears not to require tracking so I'll just knock up a LM317/337 type supply, stick and IEC socket and fuse holder on and rip the old ICs and caps out. Phew!

--- End quote ---

Wouldn't it be easier to just clean up and recap the original board with the bodge wire?  |O

[EDIT]

D'oh!  Or is that what you did?

[/EDIT]


mnem
 :-//

Brumby:
My under bench lighting has revealed something I didn't want to think about .... The dust collection in the far corners looks like there was an explosion in a felting class.

It's something I just can't unsee ...  :(

I'm just wondering what will travel up the hose if I get the vacuum out......

bd139:

--- Quote from: Specmaster on May 25, 2018, 11:20:06 pm ---Excellent work, you will be so proud once you have this completed. Do you think this is one that your Mother might have worked on?

I also secured this just a few minutes ago, of to Clacton tomorrow to collect it, never seen one before but seller swears it works OK.

--- End quote ---

Quite possible actually. There’s no signatures on the QA sticker though. Unlike tek :(

Last cal date on this was 1983!

Those are really nice. My father had one. He left the C battery in it though and it dissolved everything.

bd139:

--- Quote from: tautech on May 25, 2018, 11:46:21 pm ---
--- Quote from: bd139 on May 25, 2018, 11:05:03 pm ---This one is hard work ... this evening's shenanigans...
--- End quote ---
You know it'll be worth it !



--- Quote ---Now one really cool thing is the trace is crispier than a crispy thing from planet crisp. Shot in X-Y mode. Not bad for a 42 year old scope:



--- End quote ---
Some centralization adjustments needed.  ;)

--- End quote ---

The cal is completely shagged to be honest. Mr helpful who fixed it last time decided to just twiddle until it showed something about right  :palm:

bd139:

--- Quote from: mnementh on May 26, 2018, 12:22:35 am ---
--- Quote from: bd139 on May 25, 2018, 12:01:57 pm ---Ok regulators are shot, caps are shot, half the diodes are shot in the power supply.

So I bypassed the power supply, which is neatly possible due to two links on the board, and chucked a bench power supply on it.

And you know what? It only still works perfectly. I am extremely surprised!

It pulls a monster current of 40mA per rail and the supply appears not to require tracking so I'll just knock up a LM317/337 type supply, stick and IEC socket and fuse holder on and rip the old ICs and caps out. Phew!

--- End quote ---

Wouldn't it be easier to just clean up and recap the original board with the bodge wire?  |O

[EDIT]

D'oh!  Or is that what you did?

[/EDIT]


mnem
 :-//

--- End quote ---

I thought about that but the original board actually had electrolyte soak into it and it was oozing out of the sides as well. I think that one is a write off. The other board was in perfect condition just a bit dusty. Also it was attached to the chassis that had an IEC socket instead of the weird as hell 1970s proprietary inline thing they the other one had. Ergo I decided to take the hard road and make a frankenscope!

Edit: plus I actually enjoy doing things the sick twisted and hard way

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