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| Re: LCIII Recap - Apple design fault -47uF reversed! [message #48328 is a reply to message #48302] |
Thu, 11 April 2013 07:29   |
The One True Stickman
Messages: 85
Registered: April 2013
Karma: 0
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Member |
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I'd chime in over there but I don't think I'm a member of that list. (Or
if I am, I don't recall my login at the moment...)
In a quick read, it's not clear exactly what Paul means by "electrically
the wrong way around". Have pin connections been confirmed with an
ohmmeter? Rick is correct that for any polarized capacitor on a negative
voltage rail, the + side should be connected to ground and the - side to
the negative voltage rail; if that is not the case, then they are indeed
electrically the wrong way around. However, if the + side is connected to
ground, that should be correct.
Paul is also correct about the polarity marking, that the bar denotes the
anode (+) side of the cap. Note that on standard aluminum electrolytics the
bar denotes the cathode (negative) pin.
If these are all the yellow tantalum electrolytics and they are indeed the
wrong way around, I'm extremely surprised they haven't failed - tants
generally hate any reverse voltage at all and will fail, sometimes
spectacularly and more often sooner than later.
On Thursday, April 11, 2013 1:44:48 AM UTC-4, Notgoing Totellyou wrote:
>
> Can somebody electrically experienced please shed some light on this topic?
> Thanks!
> LCIII Recap - Apple design fault -47uF reversed!< http://68kmla.org/forums/viewtopic.php?f=29&t=20936#p201 342>
> http://68kmla.org/forums/viewtopic.php?f=29&t=20936
>
>
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| Re: LCIII Recap - Apple design fault -47uF reversed! [message #48450 is a reply to message #48328] |
Thu, 11 April 2013 16:59 |
Notgoing Totellyou
Messages: 284
Registered: December 2012
Karma: 0
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Senior Member |
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I don't know how apple could have screwed up like that.
On Thu, Apr 11, 2013 at 7:29 AM, The One True Stickman <
theonetruestickman@gmail.com> wrote:
> I'd chime in over there but I don't think I'm a member of that list. (Or
> if I am, I don't recall my login at the moment...)
>
> In a quick read, it's not clear exactly what Paul means by "electrically
> the wrong way around". Have pin connections been confirmed with an
> ohmmeter? Rick is correct that for any polarized capacitor on a negative
> voltage rail, the + side should be connected to ground and the - side to
> the negative voltage rail; if that is not the case, then they are indeed
> electrically the wrong way around. However, if the + side is connected to
> ground, that should be correct.
>
> Paul is also correct about the polarity marking, that the bar denotes the
> anode (+) side of the cap. Note that on standard aluminum electrolytics the
> bar denotes the cathode (negative) pin.
>
> If these are all the yellow tantalum electrolytics and they are indeed the
> wrong way around, I'm extremely surprised they haven't failed - tants
> generally hate any reverse voltage at all and will fail, sometimes
> spectacularly and more often sooner than later.
>
>
>
> On Thursday, April 11, 2013 1:44:48 AM UTC-4, Notgoing Totellyou wrote:
>>
>> Can somebody electrically experienced please shed some light on this
>> topic?
>> Thanks!
>> LCIII Recap - Apple design fault -47uF reversed!< http://68kmla.org/forums/viewtopic.php?f=29&t=20936#p201 342>
>> http://68kmla.org/forums/viewtopic.php?f=29&t=20936
>>
>> --
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| Re: LCIII Recap - Apple design fault -47uF reversed! [message #48451 is a reply to message #48450] |
Thu, 11 April 2013 19:31 |
Britt Dodd
Messages: 26
Registered: August 2012
Karma: 0
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Junior Member |
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By the way not to alarm you but if you do put those in backward and they do
explode its not a pretty sight.
On Apr 11, 2013 4:59 PM, "Hardware Mack" <hardwaremack@gmail.com> wrote:
> I don't know how apple could have screwed up like that.
>
>
>
> On Thu, Apr 11, 2013 at 7:29 AM, The One True Stickman <
> theonetruestickman@gmail.com> wrote:
>
>> I'd chime in over there but I don't think I'm a member of that list. (Or
>> if I am, I don't recall my login at the moment...)
>>
>> In a quick read, it's not clear exactly what Paul means by "electrically
>> the wrong way around". Have pin connections been confirmed with an
>> ohmmeter? Rick is correct that for any polarized capacitor on a negative
>> voltage rail, the + side should be connected to ground and the - side to
>> the negative voltage rail; if that is not the case, then they are indeed
>> electrically the wrong way around. However, if the + side is connected to
>> ground, that should be correct.
>>
>> Paul is also correct about the polarity marking, that the bar denotes the
>> anode (+) side of the cap. Note that on standard aluminum electrolytics the
>> bar denotes the cathode (negative) pin.
>>
>> If these are all the yellow tantalum electrolytics and they are indeed
>> the wrong way around, I'm extremely surprised they haven't failed - tants
>> generally hate any reverse voltage at all and will fail, sometimes
>> spectacularly and more often sooner than later.
>>
>>
>>
>> On Thursday, April 11, 2013 1:44:48 AM UTC-4, Notgoing Totellyou wrote:
>>>
>>> Can somebody electrically experienced please shed some light on this
>>> topic?
>>> Thanks!
>>> LCIII Recap - Apple design fault -47uF reversed!< http://68kmla.org/forums/viewtopic.php?f=29&t=20936#p201 342>
>>> http://68kmla.org/forums/viewtopic.php?f=29&t=20936
>>>
>>> --
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>
>
>
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| RE: LCIII Recap - Apple design fault -47uF reversed! [message #48452 is a reply to message #48451] |
Thu, 11 April 2013 19:46 |
Jason Johnson
Messages: 131
Registered: August 2012
Karma: 0
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Senior Member |
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If they are backwards from factory but worked what are they servicing?
Date: Thu, 11 Apr 2013 19:31:25 -0400
Subject: Re: LCIII Recap - Apple design fault -47uF reversed!
From: brittman914@gmail.com
To: vintage-macs@googlegroups.com
By the way not to alarm you but if you do put those in backward and they do explode its not a pretty sight.
On Apr 11, 2013 4:59 PM, "Hardware Mack" <hardwaremack@gmail.com> wrote:
I don't know how apple could have screwed up like that.
On Thu, Apr 11, 2013 at 7:29 AM, The One True Stickman <theonetruestickman@gmail.com> wrote:
I'd chime in over there but I don't think I'm a member of that list. (Or if I am, I don't recall my login at the moment...)
In
a quick read, it's not clear exactly what Paul means by "electrically
the wrong way around". Have pin connections been confirmed with an ohmmeter? Rick is correct that for any polarized capacitor on a negative voltage
rail, the + side should be connected to ground and the - side to the
negative voltage rail; if that is not the case, then they are indeed
electrically the wrong way around. However, if the + side is connected
to ground, that should be correct.
Paul is also correct about the polarity marking, that the bar denotes the anode (+) side of the cap. Note that on standard
aluminum electrolytics the bar denotes the cathode (negative) pin.
If these
are all the yellow tantalum electrolytics and they are indeed the wrong
way around, I'm extremely surprised they haven't failed - tants
generally hate any reverse voltage at all and will fail, sometimes
spectacularly and more often sooner than later.
On Thursday, April 11, 2013 1:44:48 AM UTC-4, Notgoing Totellyou wrote:
Can somebody electrically experienced please shed some light on this topic?Thanks!
LCIII Recap - Apple design fault -47uF reversed!
http://68kmla.org/forums/viewtopic.php?f=29&t=20936
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| Re: LCIII Recap - Apple design fault -47uF reversed! [message #48453 is a reply to message #48452] |
Thu, 11 April 2013 20:12 |
Notgoing Totellyou
Messages: 284
Registered: December 2012
Karma: 0
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Senior Member |
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I'm not the one that discovered this.
I just wanted to get your guys thoughts on this.
I have recapped many and always put the new ones back just like the old ones and never had a problem with the LC - III
On Apr 11, 2013, at 7:46 PM, Jason Johnson wrote:
> If they are backwards from factory but worked what are they servicing?
>
> Date: Thu, 11 Apr 2013 19:31:25 -0400
> Subject: Re: LCIII Recap - Apple design fault -47uF reversed!
> From: brittman914@gmail.com
> To: vintage-macs@googlegroups.com
>
> By the way not to alarm you but if you do put those in backward and they do explode its not a pretty sight.
> On Apr 11, 2013 4:59 PM, "Hardware Mack" <hardwaremack@gmail.com> wrote:
> I don't know how apple could have screwed up like that.
>
>
>
> On Thu, Apr 11, 2013 at 7:29 AM, The One True Stickman <theonetruestickman@gmail.com> wrote:
> I'd chime in over there but I don't think I'm a member of that list. (Or if I am, I don't recall my login at the moment...)
>
> In a quick read, it's not clear exactly what Paul means by "electrically the wrong way around". Have pin connections been confirmed with an ohmmeter? Rick is correct that for any polarized capacitor on a negative voltage rail, the + side should be connected to ground and the - side to the negative voltage rail; if that is not the case, then they are indeed electrically the wrong way around. However, if the + side is connected to ground, that should be correct.
>
> Paul is also correct about the polarity marking, that the bar denotes the anode (+) side of the cap. Note that on standard aluminum electrolytics the bar denotes the cathode (negative) pin.
>
> If these are all the yellow tantalum electrolytics and they are indeed the wrong way around, I'm extremely surprised they haven't failed - tants generally hate any reverse voltage at all and will fail, sometimes spectacularly and more often sooner than later.
>
>
>
> On Thursday, April 11, 2013 1:44:48 AM UTC-4, Notgoing Totellyou wrote:
> Can somebody electrically experienced please shed some light on this topic?
> Thanks!
> LCIII Recap - Apple design fault -47uF reversed!
>
> http://68kmla.org/forums/viewtopic.php?f=29&t=20936
>
>
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| Re: LCIII Recap - Apple design fault -47uF reversed! [message #48454 is a reply to message #48328] |
Thu, 11 April 2013 20:42 |
Scott Holder
Messages: 32
Registered: August 2012
Karma: 0
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Member |
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On 4/11/2013 7:29 AM, The One True Stickman wrote:
> <snip>
>
> If these are all the yellow tantalum electrolytics and they are indeed
> the wrong way around, I'm extremely surprised they haven't failed -
> tants generally hate any reverse voltage at all and will fail,
> sometimes spectacularly and more often sooner than later.
I'm remembering a story relayed to me by an old friend a long time ago
whereby he got a brand new Atari ST with a backwards cap in it
somewhere, which exploded rather spectacularly indeed. If this is indeed
backwards, I'd have expected it to fail or something by now on many
computers. Else there's coincidentally another failure somewhere else
that protected it?
Scott
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| RE: LCIII Recap - Apple design fault -47uF reversed! [message #48455 is a reply to message #48454] |
Thu, 11 April 2013 21:50 |
Jason Johnson
Messages: 131
Registered: August 2012
Karma: 0
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Senior Member |
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I ask only because I have some recapped that worked before and after and are set up as pictured and work. So do I test and turn them around if it shows like stated?
> Date: Thu, 11 Apr 2013 20:42:39 -0400
> From: scott@iamscott.net
> To: vintage-macs@googlegroups.com
> Subject: Re: LCIII Recap - Apple design fault -47uF reversed!
>
> On 4/11/2013 7:29 AM, The One True Stickman wrote:
>> <snip>
>>
>> If these are all the yellow tantalum electrolytics and they are indeed
>> the wrong way around, I'm extremely surprised they haven't failed -
>> tants generally hate any reverse voltage at all and will fail,
>> sometimes spectacularly and more often sooner than later.
>
> I'm remembering a story relayed to me by an old friend a long time ago
> whereby he got a brand new Atari ST with a backwards cap in it
> somewhere, which exploded rather spectacularly indeed. If this is indeed
> backwards, I'd have expected it to fail or something by now on many
> computers. Else there's coincidentally another failure somewhere else
> that protected it?
>
> Scott
>
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| Re: LCIII Recap - Apple design fault -47uF reversed! [message #48456 is a reply to message #48450] |
Thu, 11 April 2013 23:04 |
Dylan McDermond
Messages: 133
Registered: August 2012
Karma: 0
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Senior Member |
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As I recall, my IIcx had two "backwards" caps too. Mounted from the factory opposite the printing on the board.
- Dylan
On Apr 11, 2013, at 1:59 PM, Hardware Mack <hardwaremack@gmail.com> wrote:
> I don't know how apple could have screwed up like that.
>
>
>
> On Thu, Apr 11, 2013 at 7:29 AM, The One True Stickman <theonetruestickman@gmail.com> wrote:
>> I'd chime in over there but I don't think I'm a member of that list. (Or if I am, I don't recall my login at the moment...)
>>
>> In a quick read, it's not clear exactly what Paul means by "electrically the wrong way around". Have pin connections been confirmed with an ohmmeter? Rick is correct that for any polarized capacitor on a negative voltage rail, the + side should be connected to ground and the - side to the negative voltage rail; if that is not the case, then they are indeed electrically the wrong way around. However, if the + side is connected to ground, that should be correct.
>>
>> Paul is also correct about the polarity marking, that the bar denotes the anode (+) side of the cap. Note that on standard aluminum electrolytics the bar denotes the cathode (negative) pin.
>>
>> If these are all the yellow tantalum electrolytics and they are indeed the wrong way around, I'm extremely surprised they haven't failed - tants generally hate any reverse voltage at all and will fail, sometimes spectacularly and more often sooner than later.
>>
>>
>>
>> On Thursday, April 11, 2013 1:44:48 AM UTC-4, Notgoing Totellyou wrote:
>>>
>>> Can somebody electrically experienced please shed some light on this topic?
>>> Thanks!
>>> LCIII Recap - Apple design fault -47uF reversed!
>>> http://68kmla.org/forums/viewtopic.php?f=29&t=20936
>>>
>> --
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| RE: LCIII Recap - Apple design fault -47uF reversed! [message #48457 is a reply to message #48456] |
Thu, 11 April 2013 23:39 |
Jason Johnson
Messages: 131
Registered: August 2012
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But he says the polarity marking on the board is incorrect also.
Subject: Re: LCIII Recap - Apple design fault -47uF reversed!
From: dylan@mcdermond.net
Date: Thu, 11 Apr 2013 20:04:03 -0700
To: vintage-macs@googlegroups.com
As I recall, my IIcx had two "backwards" caps too. Mounted from the factory opposite the printing on the board.
- Dylan
On Apr 11, 2013, at 1:59 PM, Hardware Mack <hardwaremack@gmail.com> wrote:
I don't know how apple could have screwed up like that.
On Thu, Apr 11, 2013 at 7:29 AM, The One True Stickman <theonetruestickman@gmail.com> wrote:
I'd chime in over there but I don't think I'm a member of that list. (Or if I am, I don't recall my login at the moment...)
In
a quick read, it's not clear exactly what Paul means by "electrically
the wrong way around". Have pin connections been confirmed with an ohmmeter? Rick is correct that for any polarized capacitor on a negative voltage
rail, the + side should be connected to ground and the - side to the
negative voltage rail; if that is not the case, then they are indeed
electrically the wrong way around. However, if the + side is connected
to ground, that should be correct.
Paul is also correct about the polarity marking, that the bar denotes the anode (+) side of the cap. Note that on standard
aluminum electrolytics the bar denotes the cathode (negative) pin.
If these
are all the yellow tantalum electrolytics and they are indeed the wrong
way around, I'm extremely surprised they haven't failed - tants
generally hate any reverse voltage at all and will fail, sometimes
spectacularly and more often sooner than later.
On Thursday, April 11, 2013 1:44:48 AM UTC-4, Notgoing Totellyou wrote:
Can somebody electrically experienced please shed some light on this topic?Thanks!
LCIII Recap - Apple design fault -47uF reversed!
http://68kmla.org/forums/viewtopic.php?f=29&t=20936
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| Re: LCIII Recap - Apple design fault -47uF reversed! [message #48458 is a reply to message #48456] |
Thu, 11 April 2013 23:42 |
Notgoing Totellyou
Messages: 284
Registered: December 2012
Karma: 0
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Senior Member |
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well please go to my Caps! thread on that and tell me what caps are as so.
http://68kmla.org/forums/viewtopic.php?f=29&t=19596
knowing about this, but not documenting it, will not help anyone :-P
On Apr 11, 2013, at 11:04 PM, Dylan McDermond wrote:
> As I recall, my IIcx had two "backwards" caps too. Mounted from the factory opposite the printing on the board.
>
> - Dylan
>
> On Apr 11, 2013, at 1:59 PM, Hardware Mack <hardwaremack@gmail.com> wrote:
>
>> I don't know how apple could have screwed up like that.
>>
>>
>>
>> On Thu, Apr 11, 2013 at 7:29 AM, The One True Stickman <theonetruestickman@gmail.com> wrote:
>> I'd chime in over there but I don't think I'm a member of that list. (Or if I am, I don't recall my login at the moment...)
>>
>> In a quick read, it's not clear exactly what Paul means by "electrically the wrong way around". Have pin connections been confirmed with an ohmmeter? Rick is correct that for any polarized capacitor on a negative voltage rail, the + side should be connected to ground and the - side to the negative voltage rail; if that is not the case, then they are indeed electrically the wrong way around. However, if the + side is connected to ground, that should be correct.
>>
>> Paul is also correct about the polarity marking, that the bar denotes the anode (+) side of the cap. Note that on standard aluminum electrolytics the bar denotes the cathode (negative) pin.
>>
>> If these are all the yellow tantalum electrolytics and they are indeed the wrong way around, I'm extremely surprised they haven't failed - tants generally hate any reverse voltage at all and will fail, sometimes spectacularly and more often sooner than later.
>>
>>
>>
>> On Thursday, April 11, 2013 1:44:48 AM UTC-4, Notgoing Totellyou wrote:
>> Can somebody electrically experienced please shed some light on this topic?
>> Thanks!
>> LCIII Recap - Apple design fault -47uF reversed!
>> http://68kmla.org/forums/viewtopic.php?f=29&t=20936
>>
>>
>> --
>> --
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>>
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>> Charles
>>
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| RE: LCIII Recap - Apple design fault -47uF reversed! [message #48459 is a reply to message #48458] |
Fri, 12 April 2013 00:28 |
Jason Johnson
Messages: 131
Registered: August 2012
Karma: 0
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Senior Member |
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I'm just trying to get it straight at the moment. I'm looking at mine right now and it works, so does this cap go to anything or is it like a backup? How can it function? If incorrectly polarized what does that cause? Was it intended? I am unclear.
From: hardwaremack@gmail.com
Subject: Re: LCIII Recap - Apple design fault -47uF reversed!
Date: Thu, 11 Apr 2013 23:42:35 -0400
To: vintage-macs@googlegroups.com
well please go to my Caps! thread on that and tell me what caps are as so.http://68kmla.org/forums/viewtopic.php?f=29&t=19596
knowing about this, but not documenting it, will not help anyone :-P
On Apr 11, 2013, at 11:04 PM, Dylan McDermond wrote:As I recall, my IIcx had two "backwards" caps too. Mounted from the factory opposite the printing on the board.
- Dylan
On Apr 11, 2013, at 1:59 PM, Hardware Mack <hardwaremack@gmail.com> wrote:
I don't know how apple could have screwed up like that.
On Thu, Apr 11, 2013 at 7:29 AM, The One True Stickman <theonetruestickman@gmail.com> wrote:
I'd chime in over there but I don't think I'm a member of that list. (Or if I am, I don't recall my login at the moment...)
In
a quick read, it's not clear exactly what Paul means by "electrically
the wrong way around". Have pin connections been confirmed with an ohmmeter? Rick is correct that for any polarized capacitor on a negative voltage
rail, the + side should be connected to ground and the - side to the
negative voltage rail; if that is not the case, then they are indeed
electrically the wrong way around. However, if the + side is connected
to ground, that should be correct.
Paul is also correct about the polarity marking, that the bar denotes the anode (+) side of the cap. Note that on standard
aluminum electrolytics the bar denotes the cathode (negative) pin.
If these
are all the yellow tantalum electrolytics and they are indeed the wrong
way around, I'm extremely surprised they haven't failed - tants
generally hate any reverse voltage at all and will fail, sometimes
spectacularly and more often sooner than later.
On Thursday, April 11, 2013 1:44:48 AM UTC-4, Notgoing Totellyou wrote:
Can somebody electrically experienced please shed some light on this topic?Thanks!
LCIII Recap - Apple design fault -47uF reversed!
http://68kmla.org/forums/viewtopic.php?f=29&t=20936
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| RE: LCIII Recap - Apple design fault -47uF reversed! [message #48460 is a reply to message #48459] |
Fri, 12 April 2013 00:38 |
Jason Johnson
Messages: 131
Registered: August 2012
Karma: 0
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Senior Member |
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Ok I tested my LCIII, my 605's and my 475 and all read 5.13 (give or take) volts from the positive side of the positive marked board for the positive side of the capacitor. Now I am not sure but are you positive that yours were capped correctly? My positive marking is toward the ram slots and work as such with the proper 5 volts.
From: havokalien@hotmail.com
To: vintage-macs@googlegroups.com
Subject: RE: LCIII Recap - Apple design fault -47uF reversed!
Date: Thu, 11 Apr 2013 21:28:23 -0700
I'm just trying to get it straight at the moment. I'm looking at mine right now and it works, so does this cap go to anything or is it like a backup? How can it function? If incorrectly polarized what does that cause? Was it intended? I am unclear.
From: hardwaremack@gmail.com
Subject: Re: LCIII Recap - Apple design fault -47uF reversed!
Date: Thu, 11 Apr 2013 23:42:35 -0400
To: vintage-macs@googlegroups.com
well please go to my Caps! thread on that and tell me what caps are as so.http://68kmla.org/forums/viewtopic.php?f=29&t=19596
knowing about this, but not documenting it, will not help anyone :-P
On Apr 11, 2013, at 11:04 PM, Dylan McDermond wrote:As I recall, my IIcx had two "backwards" caps too. Mounted from the factory opposite the printing on the board.
- Dylan
On Apr 11, 2013, at 1:59 PM, Hardware Mack <hardwaremack@gmail.com> wrote:
I don't know how apple could have screwed up like that.
On Thu, Apr 11, 2013 at 7:29 AM, The One True Stickman <theonetruestickman@gmail.com> wrote:
I'd chime in over there but I don't think I'm a member of that list. (Or if I am, I don't recall my login at the moment...)
In
a quick read, it's not clear exactly what Paul means by "electrically
the wrong way around". Have pin connections been confirmed with an ohmmeter? Rick is correct that for any polarized capacitor on a negative voltage
rail, the + side should be connected to ground and the - side to the
negative voltage rail; if that is not the case, then they are indeed
electrically the wrong way around. However, if the + side is connected
to ground, that should be correct.
Paul is also correct about the polarity marking, that the bar denotes the anode (+) side of the cap. Note that on standard
aluminum electrolytics the bar denotes the cathode (negative) pin.
If these
are all the yellow tantalum electrolytics and they are indeed the wrong
way around, I'm extremely surprised they haven't failed - tants
generally hate any reverse voltage at all and will fail, sometimes
spectacularly and more often sooner than later.
On Thursday, April 11, 2013 1:44:48 AM UTC-4, Notgoing Totellyou wrote:
Can somebody electrically experienced please shed some light on this topic?Thanks!
LCIII Recap - Apple design fault -47uF reversed!
http://68kmla.org/forums/viewtopic.php?f=29&t=20936
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| Re: LCIII Recap - Apple design fault -47uF reversed! [message #48461 is a reply to message #48458] |
Fri, 12 April 2013 02:57 |
Dylan McDermond
Messages: 133
Registered: August 2012
Karma: 0
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Senior Member |
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On Apr 11, 2013, at 8:42 PM, Hardware Mack <hardwaremack@gmail.com> wrote:
> well please go to my Caps! thread on that and tell me what caps are as so.
> http://68kmla.org/forums/viewtopic.php?f=29&t=19596
>
> knowing about this, but not documenting it, will not help anyone :-P
They were C15 and C16. The 10uf capacitors.
- Dylan
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| Re: LCIII Recap - Apple design fault -47uF reversed! [message #48464 is a reply to message #48460] |
Fri, 12 April 2013 07:16 |
The One True Stickman
Messages: 85
Registered: April 2013
Karma: 0
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Member |
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On Fri, Apr 12, 2013 at 12:38 AM, Jason Johnson <havokalien@hotmail.com>wrote:
> Ok I tested my LCIII, my 605's and my 475 and all read 5.13 (give or take)
> volts from the positive side of the positive marked board for the positive
> side of the capacitor. Now I am not sure but are you positive that yours
> were capped correctly? My positive marking is toward the ram slots and
> work as such with the proper 5 volts.
>
I wouldn't mess with success - if your caps have correct voltage polarity
as you measured and everything works, I wouldn't change anything. The
easiest way to know if caps or markings are backward is to do exactly what
you did - measure voltage across the cap. If the voltage polarity matches
the cap polarity, you're all set, regardless of what the silkscreen says.
It's been noted before, but for anyone else testing: Aluminum electrolytics
(the silver cans) have the stripe on the negative side of the cap, but
tantalums (the yellow bricks) mark the positive side.
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