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Test Equipment Anonymous (TEA) group therapy thread

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glarsson:

--- Quote from: GerryBags on May 24, 2018, 09:28:18 pm ---... it was telling me a Vishay .01% 110k resistor was 100.009 - 100.010.

--- End quote ---
That's not good. Bad meter or bad typing?

Specmaster:

--- Quote from: GerryBags on May 24, 2018, 09:28:18 pm ---Thank the stars for dopey Ebay sellers (sometimes)!

My 3455A was sold as not working because it wasn't reading on the resistance ranges (apparently), I have just tested it after first checking the line voltage selectors, and because I remembered to RTFM, the line frequency selector.... which was set to 60 Hz, not 50. I didn't think that on its own would be the issue, but apparently it must have been as once powered up, and self-test run (not even warm) it was telling me a Vishay .01% 110k resistor was 100.009 - 100.010.

Then I had to turn it off because I thought I smelled magic smoke. I opened it up though, and I can't see any signs.... just really clean, gold-plated loveliness. I didn't find any evidence of smoke release, but I did find a dry solder joint on one of the EL caps inside the shield. I gave it a wiggle and you can feel both too much movement and a vary faint click as the joint opens and closes. Bummer.

Does anyone have a hi-res scan of the service manual? Most of the schematics in the one I found are just too low to see component IDs. I've got an original Operating Instructions manual on order, but I'm not sure that has the full schematics in.

Whichever way I cut it, it looks like a real bargain: Best £100 I ever spent  :-+

--- End quote ---
Are you sure of the figures here, 110K .01% should read no more or less then 110.011K or 109.989K your resistor seems to have lost 10K??

GerryBags:

--- Quote from: Neomys Sapiens on May 24, 2018, 09:42:24 pm ---My granddad served with a PzInst, first in Africa, later in Russia. So my early youth (when he was still around) was filled with stories about how to salvage a Tiger with three 18ton-halftracks, how the material suffered from the eastern cold and how they improvised vehicles (specially in africa), like scabbing a british PaK onto a salvaged italian tank and so on.
It took a long time for me to come back to armoured vehicles, but when I did, it was in the veritable house of Krauss-Maffei Wegmann. Had a lot of fun and interesting work there. As it is the home of the Leopard2, it was always very funny when you had someone at the telephone and they always were a bit shocked when a driver in the yard opened the throttle a bit. Lovely sound!

--- End quote ---

It was the skill and ingenuity of fellows like your Grandfather, recovering and repairing vehicles thought by the Allies to be destroyed, that led to the Royal engineers going out at the end of a day's action and using as much explosive as they had to hand to blow up any tanks into as small pieces as possible.

I have pictures in one of my books of the recovery of a Tiger with three FAMO's, and somewhere I have one of a Tiger being towed by four because of a missing track, that's a serious amount of metal, and too much for many of the bridges they had to cross in the East. The maintenance and recovery operations always interested me as much as the combat and strategy. They certainly make for interesting models. I sold a really nice kit of the FAMO 18-Ton half-track to buy a 'scope - I only have room for one space hungry hobby ;D

I'd have loved a chance to rifle through your company's archives, I bet there's some model-maker's gold in their filing cabinets!

And yes, 100K... My typing AND screen reading suck, I double tapped the one, not the zero. I also forgot to store the lead resistance and subtract it from the reading. Now I'm off to find which set of Kelvin leads got the recommendation in that recent thread.

tautech:

--- Quote from: GerryBags on May 24, 2018, 10:00:27 pm ---I sold a really nice kit of the FAMO 18-Ton half-track to buy a 'scope - I only have room for one space hungry hobby ;D

--- End quote ---
YOU SOLD WHAT ?  :scared:

You should've bought a bigger place !  :P

My son  ::) but god bless him, bought a 35hp Fiat crawler for shits and giggles the other day and it spent a couple of weeks getting from one end of NZ to us in the north. Why, well cause he could and has his own decent shed in which to keep it. At only 2 tonne you can shift it on a decent 2 axle trailer.
I'll try and plonk a pic of it here in the next day or so.

bd139:

--- Quote from: Specmaster on May 24, 2018, 09:46:49 pm --- Are there any Hacker radio fans out there in TEA land? I like to repair and restore radios and Hackers and HMV Diplomats especially and today I couldn't believe my eyes at the price this old Hacker sold for on Ebay today https://www.ebay.co.uk/itm/HACKER-SUPER-SOVEREIGN-RADIO-MODEL-NO-RP-75-MB-WELL-OVER-40-YEARS-OLD/163052588190?hash=item25f6b10c9e:g:2U4AAOSwkcFa~dc5

Just wish it was one of mine and it sold for that kind of money, could reinvest in some TEA as well then  :-DD

--- End quote ---

How the fuck did it get that much money.  You can pick up those for twenty quid at BVWS auctions!

Another D83 update. I just spent four hours rebuilding the arse of the scope from scratch.

First I had to separate the entire top half from the bottom half. This took a while, and a metric shit ton of desoldering. I really don't get why most of the power supply is connected to the top chassis with a nice connector. And then some dick decided to rats nest the rest of the wires and the heater connectors for the tube.



Now all the caps were eviscerated and new ones chucked in. The 3-pin ones, a new hole was drilled in the substrate with the Dremel into the ground plane so it took 2 pin snap in caps properly. As you can see here, I used the IEC socket equipped bottom half and jumped it onto the voltage selector.



Turn it on? Well thank fuck I checked as it was set to 220V to start with and look what turned up on the line! 250V selector activated!



In lieu of bring it up slowly on the scariac, I decided that I couldn't be arsed to drag it out so I donned suitable PPE (ear protectors and goggles) and fired it up. No explosions!

-24v rail came up at -24v ... 105V rail came up at 106V .... 24V rail came up at 27V and won't settle back down to 24V. Grr. I shall debug that one another day.

BTW if you want an exercise regime, I do recommend bench pressing Telequipment scopes. Each half of that is about 7Kg and I've been lifting bits of it around all evening. I feel like I could fight off some ninjas now.

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