Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
Specmaster:
--- Quote from: med6753 on May 27, 2018, 02:52:40 pm ---
--- 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.
--- End quote ---
Thanks for putting me right on that, all it does is make even more determined to get one like yours >:D
I'd love to see the naked view of it please, I need more porn :-DD
I agree with the 1M input, most newer scopes come with 1M these days, hence why I made a up a 50 \$\Omega\$ lead so if I need to have 50 \$\Omega\$ for a particular scope, I have the lead ready for it :-+
EDIT Just found this excellent site where a person has built one from a kit documented it as they went.
http://www.pestingers.net/pages-images/heathkit/test-equipment/ig4244/ig4244.htm
Specmaster:
--- Quote from: bd139 on May 27, 2018, 03:01:16 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 ---
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 :)
--- End quote ---
How about forward engineering a device that predicts / warns of when kit is going to let go like that, now that would be really useful.
bd139:
Already got a doomsday clock. It’s 23:59:59 all the time when you’re using “vintage” kit.
Forward engineering here is arguing with my PICkit3 to persuade it to fill up a 12f629 with something akin to a 555’s worth of functionality.
mnementh:
--- Quote from: GreyWoolfe on May 27, 2018, 01:36:18 pm ---
--- 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 ---
I scored one for free. Mine needed recapped as there were 2 bulging caps in it. I also did the same BNC mod. It probably wouldn't be a bad idea to tweak the calibration. Yours does look a bit nicer than mine but mine is quite nice considering the age.
--- End quote ---
Going price for a working example appears to be $65-80 on fleaBay. Not too bad if they do what they say, actually.
mnem
*Currently being hated by my wife's Saturn*
Specmaster:
Trust me, they exactly what they say they do, they are spot on.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version