Test Equipment Anonymous (TEA) group therapy thread

[tonyalbus]

10,- of some spares for 2955 worth 10 times... to me.

I saw that on Marktplaats and though about informing you about it, clearly not necessary 

highly appriciated!!

[mnementh]

speaking of which. It's playing back a very relaxed shine on you crazy diamonds in a quality that is not to be sniffed at.   Winner Winner, no tofu dinner.

The issue with that album is that in quiet passages with good equipment you can hear the master tape hiss.

true. I don't care, it's still good music.

In all honesty... for me it's part of the experience; it feels like the cold stillness of outer space or a moonlit winter night... and it is appropriate. I'd miss it if it went away.

mnem
 

[Cerebus]

Well I don't know. All these people getting exciting post and all that I got today was a bastard file.

Oh, and a box for the cat - but that's most deliveries.

[Specmaster]

This one's going to be a steamer 

I still have a few spare parts for these meters if you need anything.

[bd139]

This one's going to be a steamer 

I still have a few spare parts for these meters if you need anything.

Thanks for the offer but I've sussed it already. U7, the diode bridge is completely and totally nuked. It's borked on amps and ohms. I'm going to desolder it and see where I get...

[med6753]

OMG

Holy shitballs Batman. 

[Kosmic]

If this is chinese fake... they do a hell of a good job!.

not bad for 59,- to my door.

I ordered one too 

I'll let you know if it's real or not. Got a legit Keysight over here to compare.

[bd139]

Aaand it's perma-fucked. I've just identified that the second layer of rotary switch wiper is actually curled up from the amount of current that blew the original HRC fuse 

I've left this image full size as it was difficult to photograph and see.



So I've got £20 worth of F25 bits at least out of that. Works on volts still.

[tonyalbus]

jackpot!!! woop woop,

The Fluke 1920A has options installed
high resolution and the highest prescaler for up to 1,2Ghz ..
all made in '77 
it must have cost a small fortune in that time...

[med6753]

And here's my found Gorilla activity to add to today's lesson in don't trust the prior tech.

See photo. I found why ALT mode not working on the Type 3A6. Remember these 2 transistors with the long legs? Well, that's Q263 on the left and Q260 on the right. They should be the same part number. Do they look like the same part number to you? They should both be Tech Spec 151-0228-00. Q260 is actually P/N 151-0220-00.  It's causing intermittent sync pulse. Just for giggles I swapped Q260 and Q263 and now everything works. For now I'll leave it that way but later I'll go out on Ebay and see if I can source one and a suitable substitute.

FUCKING GORILLAS 

[mnementh]

OMG

Holy shitballs Batman. 

Shitballs is a understatement... more like:   

mnem
 

[tonyalbus]

And here's my found Gorilla activity to add to today's lesson in don't trust the prior tech.

See photo. I found why ALT mode not working on the Type 3A6. Remember these 2 transistors with the long legs? Well, that's Q263 on the left and Q260 on the right. They should be the same part number. Do they look like the same part number to you? They should both be Tech Spec 151-0228-00. Q260 is actually P/N 151-0220-00.  It's causing intermittent sync pulse. Just for giggles I swapped Q260 and Q263 and now everything works. For now I'll leave it that way but later I'll go out on Ebay and see if I can source one and a suitable substitute.

FUCKING GORILLAS 

And that metal strip..is that controling the power switch? ..does also look like a gorrilla worked on that...

[mnementh]

Yeah, med already mentioned that; clearly the plugin was handled carelessly and got dropped. Happens a lot more than we'd care to admit; an occupational hazard with these scopes.

med, dooya think that mismatched part coulda just been a old blind bastard like me misread the numbers...? I mean, it was just one digit, and we all know those plastic packages have a lot of variation. Alternately, coulda-shoulda been a matched pair, which obvi they are not, even if it was the same part number.

mnem
 

[Robert763]

jackpot!!! woop woop,

The Fluke 1920A has options installed
high resolution and the highest prescaler for up to 1,2Ghz ..
all made in '77 
it must have cost a small fortune in that time...

Wait until one with a skanky case or duff LCD turns up cheap.
Who need current meaurement on a hammer anyway?

[Saskia]

heydiddlidey, the parts for Streamer #2 are working fine.
now I need to heatpipe everything and mount it appropriately, and then I can offer Zucca another Apple

[med6753]

Well lucky day for me. Turns out I already had a 151-0228-00 on hand. Back in June when I was working on the Type 561B and I created the smoke and flames the PSU used that transistor so I ordered one just in case. Turns out the original was OK and in addition I now have that Type 561B parts unit thanks to Nixiefreqq. So the 151-0220-00 was removed and correct part installed. Now solid ALT function and this finally fixes all the issues with this Type 3A6 plug-in.

What's now left is calibration/gain adjustments and compensation.

[tonyalbus]

Even de calculator works... not batteries but with powercord.... those old displays took a lot of power..
having fun with calculator...

https://youtu.be/vv2gw_I4oZY

[Kosmic]

Anybody's looking for a mouth simulator ? There's a BRUEL & KJAER 4227 on ebay.

https://www.ebay.com/itm/BRUEL-KJAER-4227-MOUTH-SIMULATOR-ARTIFICIAL-VOICE-LOOK-REF-289G/2030796521631



Funny not exactly what I had in my head when thinking about a mouth simulator.

[Specmaster]

Aaand it's perma-fucked. I've just identified that the second layer of rotary switch wiper is actually curled up from the amount of current that blew the original HRC fuse 

I've left this image full size as it was difficult to photograph and see.



So I've got £20 worth of F25 bits at least out of that. Works on volts still.

Why is it perma-fucked  PM me your address and I'll pop a new board in the post for you, untouched by any gorillas.

[SilverSolder]

Well lucky day for me. Turns out I already had a 151-0228-00 on hand. Back in June when I was working on the Type 561B and I created the smoke and flames the PSU used that transistor so I ordered one just in case. Turns out the original was OK and in addition I now have that Type 561B parts unit thanks to Nixiefreqq. So the 151-0220-00 was removed and correct part installed. Now solid ALT function and this finally fixes all the issues with this Type 3A6 plug-in.
[...]

There is something cozy about a hot tube-based scope on a chilly evening!

[bd139]

Why is it perma-fucked  PM me your address and I'll pop a new board in the post for you, untouched by any gorillas.

Ooh might take you up on that. Will be compensated of course. Will PM you later. Shit has just hit the fan here so need to go do some actual work 

[xrunner]

perma-fucked

Added to my spell check dictionary. 

[med6753]

Yeah, med already mentioned that; clearly the plugin was handled carelessly and got dropped. Happens a lot more than we'd care to admit; an occupational hazard with these scopes.

med, dooya think that mismatched part coulda just been a old blind bastard like me misread the numbers...? I mean, it was just one digit, and we all know those plastic packages have a lot of variation. Alternately, coulda-shoulda been a matched pair, which obvi they are not, even if it was the same part number.

mnem
 

Yea, that's the Channel 1 Trigger Only switch and it works OK despite being slightly bent so I'm leaving it.

OK, just one digit off. Yea, shit happens. But wouldn't the fact that the damn thing didn't work after the change be a fucking clue? 

[Cerebus]

Well lucky day for me. Turns out I already had a 151-0228-00 on hand.

AKA a 2N4888 according to one rubric. PNP, V_BCEO=150V, h_fe=500 @ 1mA 10V, I_C=100mA max, P_TOT300mW max, f_t=160 MHz.

Still made as the PN4888 by On Semi.

[Specmaster]

Why is it perma-fucked  PM me your address and I'll pop a new board in the post for you, untouched by any gorillas.

Ooh might take you up on that. Will be compensated of course. Will PM you later. Shit has just hit the fan here so need to go do some actual work 

Just paying it forwards again, I've had lots of help before, now its my turn to help 

Also the 2nd wafer is not perma-fucked either, It'll be good to bring another Fluke back into the useful world again. I take it the display is OK, all of my spare ones are knackered.