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Test Equipment Anonymous (TEA) group therapy thread

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bd139:

--- Quote from: GerryBags on May 27, 2018, 01:21:15 pm ---
--- Quote from: bd139 on May 27, 2018, 12:50:44 pm ---That’s the jobby. Looks in fantastic condition  :-+

I’ll shout what I did five minutes ago “fucking hells bells”. Power supply just blew up on my 465. Took a bridge rectifier with it. Fuuuuuuu. And such is life i now have three dead scopes on my hands.

--- End quote ---

Sorry to hear that, and I feel your pain (i'm on 4  :) )

Can we have pics of the repair, please, you know they'll come in handy for quite a few other TEA freaks... me included. There's a 475 that looks in very nice cosmetic condition, claimed to be but not shown working, on the Bay for £120.... if you feel like you need to join me on 4 dead 'scopes.

--- End quote ---

Will do. Looks like the caps are fine after testing ESR in circuit. The bridge rectifiers in these are seriously weak so tend to just blow up on their own. They replaced them with a different unit later in the production cycle. Might be that. Haven’t debugged it properly yet.

I saw that scope. It’s also only 20 mins down the road from me as well.

Honestly though the D83 is a hard one so I’m not sure I’m going to do much for my mental health taking on another project. Especially as I’m supposed to be studying for my full amateur radio license at the moment.

Specmaster:
Sorry to hear about your lovely 465 power supply falling on its sword like that  :-- On the other hand it does kind of make me glad I never ventured down the Tek route  :phew: as they are it seems forever going fucking wrong so maybe its time to look at other brands for the future?

med6753:

--- Quote from: Specmaster on May 27, 2018, 11:24:13 am ---bd139, I do indeed have the blue one, its a IG-4505 and she is in all of her original splendor the modification made was to remove the pre-attached BNC lead with the 50 \$\Omega\$ termination resistor with a BNC socket for more flexibility and of course easier storage when not in use as the lead always got in the way. I have made up a special lead with the 50 \$\Omega\$ resistor built in to retain the 50 \$\Omega\$ connection if required.

I have also recapped and cleaned it and thoroughly checked it over and tweaked the calibration to bring the output voltages up and now she is bang the money. Now of course having seen that IG-4244 of med6753 I want one as well. Not too sure which is the earlier one but I'm kinda guessing its not mine as if the numbering system went in chronological order, mine is the newer of the two.


--- End quote ---

The IG-4244 was introduced in 1984. Your IG-4505 dates much earlier than that, back into the early to mid 1970's. I think they were available concurrently, at least for a while, but I would have to check the catalogs to verify that.

The IG-4244 also has the special 50 ohm terminated coax for the "Time" output for scopes with 1MEG input impedance. Since my two 2465's have a 50 ohm input available I can use a standard RG-58 patch cable and it's properly terminated. 

I don't have time today but tomorrow I'll pull it down off the shelf and take some pron shots of the insides. I have to dexoit the range switch anyway...it's getting a little dodgy.

 

med6753:

--- Quote from: Specmaster on May 27, 2018, 02:42:02 pm ---Sorry to hear about your lovely 465 power supply falling on its sword like that  :-- On the other hand it does kind of make me glad I never ventured down the Tek route  :phew: as they are it seems forever going fucking wrong so maybe its time to look at other brands for the future?

--- End quote ---

I'm putting my 465 project on the shelf for a while. Too many other things going on here lately involving life.  I still have to pull the vertical board and fix the issues with channel 2 attenuator deck but at least all my power supply issues (for now!  :-DD) are fixed.

bd139:

--- Quote from: Specmaster on May 27, 2018, 02:42:02 pm ---Sorry to hear about your lovely 465 power supply falling on its sword like that  :-- On the other hand it does kind of make me glad I never ventured down the Tek route  :phew: as they are it seems forever going fucking wrong so maybe its time to look at other brands for the future?

--- End quote ---

To be honest they are pretty reliable. The problem here is the age of the units, the lifespan of the parts and the complexity aren’t in your favour. They were built with no compromises using the highest quality parts at the time with the intention of lasting under 8 years. This one is 44 years old so it has done fine :)


--- Quote from: med6753 on May 27, 2018, 02:57:09 pm ---
--- Quote from: Specmaster on May 27, 2018, 02:42:02 pm ---Sorry to hear about your lovely 465 power supply falling on its sword like that  :-- On the other hand it does kind of make me glad I never ventured down the Tek route  :phew: as they are it seems forever going fucking wrong so maybe its time to look at other brands for the future?

--- End quote ---

I'm putting my 465 project on the shelf for a while. Too many other things going on here lately involving life.  I still have to pull the vertical board and fix the issues with channel 2 attenuator deck but at least all my power supply issues (for now!  :-DD) are fixed.

--- End quote ---

Yeah I find you have to approach these in bursts of energy. Going to forward engineer something I think before I go insane :)

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