Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 511363 times)

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Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8350 on: March 09, 2018, 06:54:34 am »
... instead used one of the most corrosive things she could have used, salt, so with that and...

Your blood, and most intra-cellular and extra-cellular fluids are 0.9% salt so, if salt were corrosive to bodily matter you'd fall apart in pretty short order.
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Offline tautech

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8351 on: March 09, 2018, 07:01:03 am »

Well half the vertical is dead and Q4482 is seriously knackered. The collector-emitter junction is a dead short and the base-emitter junction is a deadode not a diode. 

Turns out it was 151-0446-00 (not 466) which is a pretty standard 2n3866.
When I did regular CRO repairs I looked for a well spec'ed generic plate driver amp and came up with BF259 which mostly always had a better Vmax than what designers used. Other specs were better than close enough to make it a pretty useful generic replacement.

That’s good to know. I might have some of them too :)
Grab some datasheets and check them out, I'd be interested if you're of the same opinion as I.



C'mon guys and gals we need knuckle down and get another ~60 posts in to become #2 in the 'By Replies" stats !
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Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8352 on: March 09, 2018, 07:04:20 am »
... instead used one of the most corrosive things she could have used, salt, so with that and...

Your blood, and most intra-cellular and extra-cellular fluids are 0.9% salt so, if salt were corrosive to bodily matter you'd fall apart in pretty short order.
I'm not so sure on that, neat salt brushed directly onto the teeth and into the gums? I'm no expert but that sounds highly abrasive to me wearing down the enamel and creeping beneath the gumline?
Who let Murphy in?
 

Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8353 on: March 09, 2018, 07:20:44 am »
... instead used one of the most corrosive things she could have used, salt, so with that and...

Your blood, and most intra-cellular and extra-cellular fluids are 0.9% salt so, if salt were corrosive to bodily matter you'd fall apart in pretty short order.
I'm not so sure on that, neat salt brushed directly onto the teeth and into the gums? I'm no expert but that sounds highly abrasive to me wearing down the enamel and creeping beneath the gumline?

Corrosive? Abrasive? Which are you going for? BTW, salt as a dentifrice is as old as the hills. Soot and salt was a traditional, if odd sounding, toothpaste.
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8354 on: March 09, 2018, 07:24:48 am »
Put some on a slug and you decide  :-DD
 

Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8355 on: March 09, 2018, 07:28:04 am »
... instead used one of the most corrosive things she could have used, salt, so with that and...

Your blood, and most intra-cellular and extra-cellular fluids are 0.9% salt so, if salt were corrosive to bodily matter you'd fall apart in pretty short order.
I'm not so sure on that, neat salt brushed directly onto the teeth and into the gums? I'm no expert but that sounds highly abrasive to me wearing down the enamel and creeping beneath the gumline?

Corrosive? Abrasive? Which are you going for? BTW, salt as a dentifrice is as old as the hills. Soot and salt was a traditional, if odd sounding, toothpaste.
With the abrasion wearing away the enamel, exposing the denteen which is softer the faster will be the erosion etc. Neither my dad or mum would tolerate sugar or sweets of any sorts but used salt daily and they both lost their teeth. I use normal Toothpaste and have most of my teeth and I'm 69.
Who let Murphy in?
 

Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8356 on: March 09, 2018, 07:29:22 am »
... instead used one of the most corrosive things she could have used, salt, so with that and...

Your blood, and most intra-cellular and extra-cellular fluids are 0.9% salt so, if salt were corrosive to bodily matter you'd fall apart in pretty short order.
I'm not so sure on that, neat salt brushed directly onto the teeth and into the gums? I'm no expert but that sounds highly abrasive to me wearing down the enamel and creeping beneath the gumline?

Corrosive? Abrasive? Which are you going for? BTW, salt as a dentifrice is as old as the hills. Soot and salt was a traditional, if odd sounding, toothpaste.
Don't they scream and fizz a lot.
Who let Murphy in?
 

Offline neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8357 on: March 09, 2018, 08:11:01 am »
Was it on a negative voltage rail or something? In such a case, of course, ground is positive.

Two important bits to note,
It is on a negative rail but it is completely unmarked except for in the manual.
When i do something stupid i am extremely hard on myself..... even if it doesn't ultimately matter.


The cap blew itself to smithereens, had to use an ounce of IPA to get the crud back off besides wasting a 2 dollar capacitor and that 2 dollar capacitor with shipping is a 7 dollar capacitor. But nothing more expensive than that blew up.... that i know of yet.
Hopeless addict and slave to TEA.
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Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8358 on: March 09, 2018, 08:29:09 am »
Ah, OK. Glad it was just the capacitor. As for shipping, yeah, it's kind of a bummer for small quantities. It's also a pain trying to cluster parts needs in order to make a worthwhile order.
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Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8359 on: March 09, 2018, 08:35:58 am »
Was it on a negative voltage rail or something? In such a case, of course, ground is positive.

Two important bits to note,
It is on a negative rail but it is completely unmarked except for in the manual.
When i do something stupid i am extremely hard on myself..... even if it doesn't ultimately matter.


The cap blew itself to smithereens, had to use an ounce of IPA to get the crud back off besides wasting a 2 dollar capacitor and that 2 dollar capacitor with shipping is a 7 dollar capacitor. But nothing more expensive than that blew up.... that i know of yet.
I did surmise that you managed to blow the cap, hence your comment about $7, but don't be too hard on yourself, I think we have all done that or similar things at some point in our time, especially as the circuit board was not marked. Chalk it up one of life's experience and a lesson to double check next time.  :-+ 
Who let Murphy in?
 
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Offline neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8360 on: March 09, 2018, 09:11:38 am »
Was it on a negative voltage rail or something? In such a case, of course, ground is positive.

Two important bits to note,
It is on a negative rail but it is completely unmarked except for in the manual.
When i do something stupid i am extremely hard on myself..... even if it doesn't ultimately matter.


The cap blew itself to smithereens, had to use an ounce of IPA to get the crud back off besides wasting a 2 dollar capacitor and that 2 dollar capacitor with shipping is a 7 dollar capacitor. But nothing more expensive than that blew up.... that i know of yet.
I did surmise that you managed to blow the cap, hence your comment about $7, but don't be too hard on yourself, I think we have all done that or similar things at some point in our time, especially as the circuit board was not marked. Chalk it up one of life's experience and a lesson to double check next time.  :-+

My first time popping a cap believe it or not...
Hopeless addict and slave to TEA.
Wallet does not equal Wife.
High frequency = Hoodoo.
 

Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8361 on: March 09, 2018, 09:24:58 am »
I believe it, don't they make you jump as well?
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Offline tautech

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8362 on: March 09, 2018, 09:33:00 am »
Was it on a negative voltage rail or something? In such a case, of course, ground is positive.

Two important bits to note,
It is on a negative rail but it is completely unmarked except for in the manual.
When i do something stupid i am extremely hard on myself..... even if it doesn't ultimately matter.


The cap blew itself to smithereens, had to use an ounce of IPA to get the crud back off besides wasting a 2 dollar capacitor and that 2 dollar capacitor with shipping is a 7 dollar capacitor. But nothing more expensive than that blew up.... that i know of yet.
I did surmise that you managed to blow the cap, hence your comment about $7, but don't be too hard on yourself, I think we have all done that or similar things at some point in our time, especially as the circuit board was not marked. Chalk it up one of life's experience and a lesson to double check next time.  :-+

My first time popping a cap believe it or not...
To use Specmaster's sig:

That bl**dy Murphy is always watching waiting for a chance to strike !  :rant:
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Offline neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8363 on: March 09, 2018, 11:16:28 am »
I believe it, don't they make you jump as well?

It takes alot to make me jump, this didn't. Then again it was buried in the instrument and i was too busy trying to flip it off.  :-DD
Hopeless addict and slave to TEA.
Wallet does not equal Wife.
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Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8364 on: March 09, 2018, 12:22:27 pm »
My first time popping a cap believe it or not...

I thought a while before I posted this. So far, I have never managed to make a cap pop accidentally. I've nuked a few resistors, and quite a few semiconductors, but never a cap.

I will now tip-toe around for the next few weeks, waiting for Murphy to catch up with me.

Edited to add: On thinking about it, I have had bloody Riva X-class caps go on me, but that doesn't count as it's not through application of my own stupidity.
« Last Edit: March 09, 2018, 12:24:51 pm by Cerebus »
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Offline Brumby

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8365 on: March 09, 2018, 02:54:24 pm »
My first time popping a cap believe it or not...

I thought a while before I posted this. So far, I have never managed to make a cap pop accidentally. I've nuked a few resistors, and quite a few semiconductors, but never a cap.
I could say the exact same ... but ... this is why I won't:
Quote
I will now tip-toe around for the next few weeks, waiting for Murphy to catch up with me.

 ;D
 

Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8366 on: March 09, 2018, 04:58:41 pm »
Likewise. ;D I get enough of a reminder from old tantalum caps shooting into the air when powered correctly.
You don't acquire TEA. It acquires you.
 

Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8367 on: March 09, 2018, 06:13:10 pm »
My first time popping a cap believe it or not...

I thought a while before I posted this. So far, I have never managed to make a cap pop accidentally. I've nuked a few resistors, and quite a few semiconductors, but never a cap.

I will now tip-toe around for the next few weeks, waiting for Murphy to catch up with me.

Edited to add: On thinking about it, I have had bloody Riva X-class caps go on me, but that doesn't count as it's not through application of my own stupidity.

I’ve had lots of them go on me:

1. A few mistakes when I was a kid and had no idea what I was doing. This was interesting because most of the ones I played with back then were axial and chassis cans extracted from old radios which have comedic levels of venting ie none. Experiment number 412.  Connect capacitor across AC winding. Result: hole in nan’s curtains.
2. A few not paying attention and not owning a current limiting supply. . One bounced off my head.
3. I suppose this counts but assuming that the line on an SMD tant was negative

And the most important:

4. Hundreds of sacrifices to the Flying Spaghetti Monster just because sacrificing them is fun. I will occasionally buy a bag just to blow up! Better entertainment than a Netflix sub.

Rifa X class are the suicide bombers in the rebellion against my sacrifices. They’ve got me twice now.
« Last Edit: March 09, 2018, 06:15:11 pm by bd139 »
 

Offline beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8368 on: March 09, 2018, 06:52:37 pm »
How many volts does it take to blow a 500v electro  ???

Having beer and lots of nibbles in the late afternoon sun  :popcorn:
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8369 on: March 09, 2018, 06:53:46 pm »
Not many volts if you use it wrongly :)
 

Offline beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8370 on: March 09, 2018, 06:59:06 pm »
I have a leftover lot of rather large unvented ones and I am about to salvage a Microwave >:D
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8371 on: March 09, 2018, 07:26:34 pm »
It's your moral obligation to add a large vent to each capacitor via the application of volts :D
 

Online BravoV

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8372 on: March 09, 2018, 07:34:24 pm »
Touch down, its here ...  :P

Only the unit, printed manual and power cord only.  ::)  No probe.  :'(
« Last Edit: March 09, 2018, 07:41:12 pm by BravoV »
 

Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8373 on: March 09, 2018, 08:10:49 pm »
Ooh that looks interesting. Let us know how it goes. I am looking out for an SA at the moment so might be another thing to add to the "look out for" list.


Edit: boo hiss. Looks like a couple of resistors have burned as well. Might have to rebuild the vertical amp and test it properly outside the scope  ::)  Smells "interesting".

Replying to myself here on the Tek 465 ... it is operational again after a 2 hour replacement job. Looks like the transistor just gave up. There was no other damage other than to a resistor. I didn't have a suitably rated or valued one so I used two in parallel and that worked fine. There was a moment of annoyance when it showed large trace distortion so I pulled the transistor and measured hfe (DT830 FTW) and it was way off for that transistor. So I chucked another one in and it was fine. The one with the knackered hfe I'd already had on a breadboard so it might have been slightly toasted or zenered.
 

Offline neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #8374 on: March 09, 2018, 09:24:53 pm »
Ooh that looks interesting. Let us know how it goes. I am looking out for an SA at the moment so might be another thing to add to the "look out for" list.


Edit: boo hiss. Looks like a couple of resistors have burned as well. Might have to rebuild the vertical amp and test it properly outside the scope  ::)  Smells "interesting".

Replying to myself here on the Tek 465 ... it is operational again after a 2 hour replacement job. Looks like the transistor just gave up. There was no other damage other than to a resistor. I didn't have a suitably rated or valued one so I used two in parallel and that worked fine. There was a moment of annoyance when it showed large trace distortion so I pulled the transistor and measured hfe (DT830 FTW) and it was way off for that transistor. So I chucked another one in and it was fine. The one with the knackered hfe I'd already had on a breadboard so it might have been slightly toasted or zenered.

Nice fix, it is nice to see one so simple.  :-+

I've reached a point of fixing everything to such an extent that all i have left are annoying bastards and cosmetics. Cue the part of me ordering a 7A18 just for it's knobs.
Hopeless addict and slave to TEA.
Wallet does not equal Wife.
High frequency = Hoodoo.
 


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