Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
mnementh:
--- Quote from: GerryBags on May 24, 2018, 04:04:46 am ---From what I've seen online (haven't opened it yet) the insides of the 3455A may well induce some wood.
Some great photos in those Volker Ruff books, plus all the necessary plans to build a Fries 16T gantry crane, should the need ever arise (?). I think the range of engines (and guns) they managed to shoe-horn into the Sherman is what it made it such a success. The Chrysler Multibank from the M4A4 has to be my favourite, even more than the radial. Five V8's on a common crank, genius!
--- End quote ---
Here's how they tied those 6-cyl Chrysler L-blocks together.
I personally prefer the Ford GAA (1100CID, All-Aluminum 60 degree DOHC V8!!!); its ungodly torque and narrow block is the stuff of my hot-rod dreams. It was originally designed as a V12 counterpart to the Rolls Merlin aircraft engine, but Ford couldn't get a foot in the door for non-radial designs, so it evolved (devolved?) into this.
https://youtu.be/Z88gEaY0BeY
The Chrysler multibank had a unique sound though; 5 cylinders firing simultaneously at 60 degree offset is definitely different. If they'd made an OHV version it could've been even more amazing.
And, to keep it moderately TEA related, here's a video of NYAN CAT on an oscilloscope. :P
mnem
This is the song that never ends; it goes on and on and on my friends...
bd139:
Well some bad news. Looks like my “good” telequipment D83 has been bodged heavily and got at. This is going to take a long time to work through and fix. Total strip down and rebuild at least.
bd139:
Well 20 minutes into the D83 and the power supply board is out of the good one and it is in a right state. Genuinely surprised it even powered up. I'm going to swap the entire bottom half of the dead scope into the good one. That has IEC sockets, a board which isn't totalled and some healthier looking parts on it. I've got replacement caps so will re-cap, rebuild the power supply and backplane. Fun fun fun! Will temporarily jump the mains switch to bring the power supply up on its own.
This is quite difficult to work on this one. Everything is soldered individual wires. Fortunately it's "solder by numbers" so easy enough to put back together after. I'm happy for once. No 10 minute easy fix here!
Some pictures:
Gunky cap vomit, courtesy of another British quality manufacturer (not): ITT.
PCB-eep! This might have survived if it wasn't for the massive bodge wires helping electrolyte puke capillary action.
Now for some engineering fun that my mother warned me about. The reason those big black wires are on there is a quality control fail. The board exposure was done badly and had gaps in the ground trace. It likely got all the way through assembly like this and then some poor fucker had to debug it and just jumped the duff traces with bodge wire :palm: :palm: :palm: :palm:
Other board is in much better state so will just sub that in.
Specmaster:
--- Quote from: bd139 on May 24, 2018, 04:59:16 pm ---Well 20 minutes into the D83 and the power supply board is out of the good one and it is in a right state. Genuinely surprised it even powered up. I'm going to swap the entire bottom half of the dead scope into the good one. That has IEC sockets, a board which isn't totalled and some healthier looking parts on it. I've got replacement caps so will re-cap, rebuild the power supply and backplane. Fun fun fun! Will temporarily jump the mains switch to bring the power supply up on its own.
This is quite difficult to work on this one. Everything is soldered individual wires. Fortunately it's "solder by numbers" so easy enough to put back together after. I'm happy for once. No 10 minute easy fix here!
Some pictures:
Gunky cap vomit, courtesy of another British quality manufacturer (not): ITT.
PCB-eep! This might have survived if it wasn't for the massive bodge wires helping electrolyte puke capillary action.
Now for some engineering fun that my mother warned me about. The reason those big black wires are on there is a quality control fail. The board exposure was done badly and had gaps in the ground trace. It likely got all the way through assembly like this and then some poor fucker had to debug it and just jumped the duff traces with bodge wire :palm: :palm: :palm: :palm:
Other board is in much better state so will just sub that in.
--- End quote ---
That is rapidly becoming a horror story but if anyone can beat it, that's you, you owe it to your Mother [emoji106] Regarding ITT in the electrical world when they had an interest in wholesaling there was a story that ITT stood for "It takes time" and later they changed their name and became even worse. The new name was STC and never had much stock so it became "Still to come".
From mobile device so predictive text might have struck again [emoji83]
med6753:
--- Quote from: bd139 on May 24, 2018, 04:59:16 pm ---
Now for some engineering fun that my mother warned me about. The reason those big black wires are on there is a quality control fail. The board exposure was done badly and had gaps in the ground trace. It likely got all the way through assembly like this and then some poor fucker had to debug it and just jumped the duff traces with bodge wire :palm: :palm: :palm: :palm:
Other board is in much better state so will just sub that in.
--- End quote ---
That certainly brings back memories. To 1970 and my first Heathkit. AA-14 Stereo Amp. The circuit board sustained corner damage in shipping and fractured the main ground bus. There was no way this impatient 17 year old was going to wait weeks for a replacement board. Large bodge wire very similar to yours. Luckily that was the only damage and it work fine. :-+
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