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Can you run a 7k mainframe upside down?

 

As in the subject - would anything bad happen if a 7k mainframe were
operated upside down for extended periods of time?

Don't ask why :)

D.
Dave C
 

On 29 Jun 2013, at 09:16 AM, "cheater00 ." <cheater00@...> wrote:

As in the subject - would anything bad happen if a 7k mainframe were operated upside down for extended periods of time?

Don't ask why :)

Why? (c;

Dave
[email protected]
 

Shouldn't make any difference; after all, they've been doing that in Australia and New Zealand for decades... ? ;-)

-Dave

From: "cheater00 ."
To: TekScopes@...
Sent: Saturday, June 29, 2013 9:16:18 AM
Subject: [TekScopes] Can you run a 7k mainframe upside down?

?

As in the subject - would anything bad happen if a 7k mainframe were
operated upside down for extended periods of time?

Don't ask why :)

D.
 

Well, the main idea is to run two CRTs close together so that you can
easily compare them visually.

D.

On Sat, Jun 29, 2013 at 7:09 PM, Dave C <davec2468@...> wrote:
On 29 Jun 2013, at 09:16 AM, "cheater00 ." <cheater00@...> wrote:

As in the subject - would anything bad happen if a 7k mainframe were operated upside down for extended periods of time?

Don't ask why :)

Why? (c;

Dave
Don Black
 

¿ªÔÆÌåÓý

Isn't that how it's always done (Don down-under in Australia)? ;)
Don Black.

On 30-Jun-13 2:16 AM, cheater00 . wrote:

?

As in the subject - would anything bad happen if a 7k mainframe were
operated upside down for extended periods of time?

Don't ask why :)

D.
Mark Wendt (Contractor)
 

Don,

One of my buddies from Bris-Vegas sez it's spelled and pronounced "Dow Nundah."

Is he correct? ;-)

Mark

On 6/30/2013 12:06 AM, Don Black wrote:


Isn't that how it's always done (Don down-under in Australia)? ;)
Don Black.

On 30-Jun-13 2:16 AM, cheater00 . wrote:

As in the subject - would anything bad happen if a 7k mainframe were
operated upside down for extended periods of time?

Don't ask why :)

D.
Don Black
 

¿ªÔÆÌåÓý

Oh yes, he's quite right. However New Zealand isn't pronounced Dow Corning ;).

Don Black.

On 30-Jun-13 9:53 PM, Mark Wendt (Contractor) wrote:

?

Don,

One of my buddies from Bris-Vegas sez it's spelled and pronounced "Dow
Nundah."

Is he correct? ;-)

Mark

On 6/30/2013 12:06 AM, Don Black wrote:
>
>
> Isn't that how it's always done (Don down-under in Australia)? ;)
> Don Black.
>
> On 30-Jun-13 2:16 AM, cheater00 . wrote:
>>
>> As in the subject - would anything bad happen if a 7k mainframe were
>> operated upside down for extended periods of time?
>>
>> Don't ask why :)
>>
>> D.
>>
Mark Wendt (Contractor)
 

But it could be... ;-)

Mark

On 6/30/2013 7:57 AM, Don Black wrote:


Oh yes, he's quite right. However New Zealand isn't pronounced Dow Corning ;).

Don Black.

On 30-Jun-13 9:53 PM, Mark Wendt (Contractor) wrote:

Don,

One of my buddies from Bris-Vegas sez it's spelled and pronounced "Dow
Nundah."

Is he correct? ;-)

Mark

On 6/30/2013 12:06 AM, Don Black wrote:


Isn't that how it's always done (Don down-under in Australia)? ;)
Don Black.

On 30-Jun-13 2:16 AM, cheater00 . wrote:

As in the subject - would anything bad happen if a 7k mainframe were
operated upside down for extended periods of time?

Don't ask why :)

D.
 

Returning to the original post... any ideas? :)

D.

On Sun, Jun 30, 2013 at 5:24 PM, Mark Wendt (Contractor)
<mark.wendt@...> wrote:
But it could be... ;-)

Mark

On 6/30/2013 7:57 AM, Don Black wrote:


Oh yes, he's quite right. However New Zealand isn't pronounced Dow
Corning ;).

Don Black.

On 30-Jun-13 9:53 PM, Mark Wendt (Contractor) wrote:

Don,

One of my buddies from Bris-Vegas sez it's spelled and pronounced "Dow
Nundah."

Is he correct? ;-)

Mark

On 6/30/2013 12:06 AM, Don Black wrote:


Isn't that how it's always done (Don down-under in Australia)? ;)
Don Black.

On 30-Jun-13 2:16 AM, cheater00 . wrote:

As in the subject - would anything bad happen if a 7k mainframe were
operated upside down for extended periods of time?

Don't ask why :)

D.


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Stefan Trethan
 

Yes, you can run them upside down, but only with the trace inverted,
and be prepared to go back in time (no heavy meals beforehand).

When turning over any old piece of equipment listen carefully for any
loose parts and do a visual inspection. They may cause shorts and most
equipment contains a few loose screws by design (The ones you are
always left with when putting something back together).

You'd really have to flip the CRT or deflection pins to make this
work, and everything else will still be backwards.
For heaven's sake get a few rackmounts.

ST

On Sun, Jun 30, 2013 at 7:35 PM, cheater00 . <cheater00@...> wrote:
Returning to the original post... any ideas? :)

D.
 

That raises another "Why" question.

?
HankC, Boston
WA1HOS

From: "TekScopes@..."
To: TekScopes@...
Sent: Saturday, June 29, 2013 3:06 PM
Subject: [TekScopes] Digest Number 7894

15 New Messages

Digest #7894

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by "cheater00 ." cheatercheater00@...

We are making changes based on your feedback, Thank you !
The Yahoo! Groups Product Blog


 

On Sun, Jun 30, 2013 at 8:40 PM, Stefan Trethan <stefan_trethan@...> wrote:
Yes, you can run them upside down, but only with the trace inverted,
and be prepared to go back in time (no heavy meals beforehand).

When turning over any old piece of equipment listen carefully for any
loose parts and do a visual inspection. They may cause shorts and most
equipment contains a few loose screws by design (The ones you are
always left with when putting something back together).
Are you serious or are you just joking?

You'd really have to flip the CRT or deflection pins to make this
work, and everything else will still be backwards.
For heaven's sake get a few rackmounts.
Huh.. I could just invert the vert..

OK, you can't invert the time base, now can you? I don't think so.

But this is only for XY input so I should be fine.

Hmm, now that I think about it, there's some really cool stuff I could
come up with if we had invertible timebases....!

D.
Mark Wendt
 

Unless there are some mercury switches or the like, I don't think running it upside down is going to hurt it much, if at all. The trick is going to be getting it stable in that position, and then remembering your switchology is going to be different. ;-)

Mark

On 06/30/2013 01:35 PM, cheater00 . wrote:
Returning to the original post... any ideas? :)

D.

On Sun, Jun 30, 2013 at 5:24 PM, Mark Wendt (Contractor)
<mark.wendt@...> wrote:
But it could be... ;-)

Mark

On 6/30/2013 7:57 AM, Don Black wrote:

Oh yes, he's quite right. However New Zealand isn't pronounced Dow
Corning ;).

Don Black.

On 30-Jun-13 9:53 PM, Mark Wendt (Contractor) wrote:
Don,

One of my buddies from Bris-Vegas sez it's spelled and pronounced "Dow
Nundah."

Is he correct? ;-)

Mark
 

On Sun, Jun 30, 2013 at 3:49 PM, cheater00 . <cheater00@...> wrote:
On Sun, Jun 30, 2013 at 8:40 PM, Stefan Trethan <stefan_trethan@...> wrote:
Yes, you can run them upside down, but only with the trace inverted,
and be prepared to go back in time (no heavy meals beforehand).

When turning over any old piece of equipment listen carefully for any
loose parts and do a visual inspection. They may cause shorts and most
equipment contains a few loose screws by design (The ones you are
always left with when putting something back together).
Are you serious or are you just joking?
We are all wondering the same thing about the original question.
 

Given that he was also interested in "coloring" the display - it may be that he's just trying to reverse the effects of some peculiar mushrooms...

If he asks about complementary colors we'll know for sure.....

--- In TekScopes@..., David DiGiacomo <daviddigiacomo@...> wrote:

Are you serious or are you just joking?
We are all wondering the same thing about the original question.
 

Must this be done in real time? ?I assume so, since otherwise you could just digitize (or scope photograph) and compare at your leisure.
Must it absolutely be a 7000 series scope display? What are you trying to do?


On 29 June 2013 14:07, cheater00 . <cheater00@...> wrote:
Well, the main idea is to run two CRTs close together so that you can
easily compare them visually.

D.

On Sat, Jun 29, 2013 at 7:09 PM, Dave C <davec2468@...> wrote:
> On 29 Jun 2013, at 09:16 AM, "cheater00 ." <cheater00@...> wrote:
>
> As in the subject - would anything bad happen if a 7k mainframe were operated upside down for extended periods of time?
>
> Don't ask why :)
>
> Why? (c;
>
> Dave


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John Griessen
 

On 07/01/2013 11:20 AM, Bryce Schroeder wrote:
the main idea is to run two CRTs close together so that you can
easily compare them visually.

That's what a Tek 7844 does royally...
 

On Mon, Jul 1, 2013 at 6:35 PM, John Griessen <john@...> wrote:
On 07/01/2013 11:20 AM, Bryce Schroeder wrote:
the main idea is to run two CRTs close together so that you can
easily compare them visually.

That's what a Tek 7844 does royally...
I realize, but... they actually need to be separate CRTs.

Not going to nore you guys with my ideas. If I get it done I'll let you know.
 

--- In TekScopes@..., "cheater00 ." <cheater00@...> wrote:

As in the subject - would anything bad happen if a 7k mainframe were
operated upside down for extended periods of time?

Don't ask why :)

D.
On a more serious note, you many need to consider cooling. There may be the possibility of heat sinked transistors that rely on convection cooling. This may not be the case with the particular mainframe you are considering, but it would be worth a look to see how the heat sinks are oriented. Pay a special attention to those which are moted horizontally such as the horizontal amplifer, LV power supply, and possibly the z-axis circuit (some 7000 series only).

A friend of mine mouted a flat screen LCD TV set on a sloped ceiling. While I would guess the orietation was only about 20-25 degrees off vertical, it quickly experienced a failure. A power transistor that was cooled with convection through a small tab mounted heatsink died. The fins in the heat sink were positioned for vertical convection airflow, which was reduced due to the mounting position.

- Steve
 

I'd say enroll for the ISS. There's no up and down there, you can install your scope any way you like. :-)

--- In TekScopes@..., "Steve" <ditter2@...> wrote:

--- In TekScopes@..., "cheater00 ." <cheater00@> wrote:

As in the subject - would anything bad happen if a 7k mainframe were
operated upside down for extended periods of time?

Don't ask why :)

D.
On a more serious note, you many need to consider cooling. There may be the possibility of heat sinked transistors that rely on convection cooling. This may not be the case with the particular mainframe you are considering, but it would be worth a look to see how the heat sinks are oriented. Pay a special attention to those which are moted horizontally such as the horizontal amplifer, LV power supply, and possibly the z-axis circuit (some 7000 series only).

A friend of mine mouted a flat screen LCD TV set on a sloped ceiling. While I would guess the orietation was only about 20-25 degrees off vertical, it quickly experienced a failure. A power transistor that was cooled with convection through a small tab mounted heatsink died. The fins in the heat sink were positioned for vertical convection airflow, which was reduced due to the mounting position.

- Steve

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