???

If the seller is prepared to open the scope's cover, you can try this:

1. Ask seller if take a close picture of the grid bias potentiometer to help give you an idea where the grid bias pot is set. Not really necessary but useful to have.???

2. Have him tweet the grid bias either direction ever??????so slightly and adjust intensity after???each tweet. If intensity control is effective, then maybe CRT is ok and you can fix the scope.???

You need to realign grid bias pot later. Adjusting the bias shift???the operating point so that intensity control

Can affect the electron beam.???

Cslim
On Monday, February 11, 2013, wrote:

???

This is also the symptom for a G-K short in the crt. Be careful.
-ls-

"ledlensor" rfwebb@...> wrote:
> OK, thanks. So there is a possibility.
>
> Is there any simple test I could give to the seller which might differentiate between the two?
>
> Thanks
>
> --- In TekScopes@..., David wrote:
> >
> > The hybrids are known to fail but it could also be caused by a bad DC
> > restorer which would be easy and cheap to fix.
> >
> > On Mon, 11 Feb 2013 00:04:53 +0000, Richard Webb
> > wrote:
> >
> > >Hi,
> > >
> > >Just looking at a 2465 on ebay which has ejust come up. It seems like the
> > >intensity is stuck on full brightness.
> > >
> > >I'm just wondering whether this is likely to be an easy fix? I did some
> > >googling and found someone suggesting that a similar problem might be
> > >caused by a faulty hybrid.
> > >
> > >Thanks
> >
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

From: Richard Solomon <dickw1ksz@...>
Subject: Re: [TekScopes] PYRAMID CALIBRATOR AND TESTER FOR TEKTRONIX OSCILLOSCOPES
To: TekScopes@...
Date: Monday, February 11, 2013, 4:12 PM

?

$1 each and you ship !!!!

Seriously though, put a price on them and let folks decide if it's OK or too much.

73, Dick, W1KSZ

On Mon, Feb 11, 2013 at 4:35 PM, Bob Albert <bob91343@...> wrote:

?

I have several of those Tek evaluation boards.? Put in a 9V battery and you are set to go.? Manual available on line.? Make offer. Bob --- On Mon, 2/11/13, Dave Daniel <kc0wjn@...> wrote: From: Dave Daniel <kc0wjn@...> Subject: Re: [TekScopes] PYRAMID CALIBRATOR AND TESTER FOR TEKTRONIX OSCILLOSCOPES To: TekScopes@... Date: Monday, February 11, 2013, 3:24 PM ? Got it. I found the thread. See the TekScopes thread entitled "Scope Tester on Ebay" (around 12/22). Reed Dickinson sent an email owning up to being the designer and seller of these. Cheers, Dave On 2/11/2013 2:36 PM, Pa4tim wrote: ? Nice build cabinet, could be a handy tool. But strange he uses 75 Ohm bnc connectors for a 50 Ohm output. ?Also rather expensive For that price you can make a very nice one yourself.? Just a uProcessor to generate some squares, or maybe a Xtal and something like a 4060, for higher frequency and trigger test you add the cute little Jim williams pulser. Williams also has a schematic of a very simple timemark generator ( i do not the app note from the top of my head) a TL431 or LT1027, a good opamp and some 1% resistors and a switch to make some accurate voltages ( a scope is 2 to 3% so this will be close enough)? It does not matter if frequency is not in all exact steps. For a test its OK to see if the ranges still work. I think for real calibrations this is will not be enough , it only goes up to 1uS/div and for buy-checks it can do more than needed.? If I needed one I would use this as a base :? the Tek evaluation board we reverse engineered around 2 or 3 years ago here on the group. And add this :? if you want use a switch and resistors to make fixed frequencies. 500 ps Tr and 16-160 MHz in 3 ranges so if you use 5 resistors and two switches you have 15 frequencys. Total cost maybe 10 dollar in parts, 10 bucks for a nice cabinet so you can spend 130 dollar for another scope ;-) Fred PA4TIM Op 11 feb. 2013 om 21:54 heeft Dave Daniel <> het volgende geschreven: ? This instrument was specifically discussed a while back. I'm trying to locate the emails I have; I can't recall whether it was in open forum or a series of private exchanges. The person who is selling these wanted something that he could carry around to Hamfests and other places and use to quickly evaluate 'scopes before he bought them. It looks like a very nice instrument to have, IMO. Dave On 2/11/2013 1:47 PM, ukchastuck wrote: ? Anyone ever tried one of these: to test and calibrate Tek oscilloscopes? The ebay description of the Pyramid Generator implies it can be used to reliabily set vertical amplitude calibration, horizontal time calibration and triggering capabilities. Seems you get a lot for your money if it works. Regards, Charles

Try the original home…
O
n 2013-01-13, at 10:53 AM, Michael Shiloh wrote:

Yep; looks like a problem at the site.

By the way, I'm planning on using KiCad for a class I'm teaching next
week; I've tested it over the past couple of weeks and am quite happy.

I'll be happy to share my experiences and observations as my class
progresses, if there is interest.

Michael

On 01/13/2013 10:42 AM, Ray wrote:

When I try to call up , all I get is a "System
Error". Is anyone else having a similar problem?

From: Dave Daniel
Subject: Re: [TekScopes] PYRAMID CALIBRATOR AND TESTER FOR TEKTRONIX OSCILLOSCOPES
To: TekScopes@...
Date: Monday, February 11, 2013, 3:24 PM

?

Got it. I found the thread. See the TekScopes thread entitled "Scope Tester on Ebay" (around 12/22). Reed Dickinson sent an email owning up to being the designer and seller of these.

Cheers,
Dave

On 2/11/2013 2:36 PM, Pa4tim wrote:

?

Nice build cabinet, could be a handy tool. But strange he uses 75 Ohm bnc connectors for a 50 Ohm output. ?Also rather expensive

For that price you can make a very nice one yourself.?

Just a uProcessor to generate some squares, or maybe a Xtal and something like a 4060, for higher frequency and trigger test you add the cute little Jim williams pulser. Williams also has a schematic of a very simple timemark generator ( i do not the app note from the top of my head)

a TL431 or LT1027, a good opamp and some 1% resistors and a switch to make some accurate voltages ( a scope is 2 to 3% so this will be close enough)?

It does not matter if frequency is not in all exact steps. For a test its OK to see if the ranges still work. I think for real calibrations this is will not be enough , it only goes up to 1uS/div and for buy-checks it can do more than needed.?

If I needed one I would use this as a base :?

the Tek evaluation board we reverse engineered around 2 or 3 years ago here on the group.

And add this :? if you want use a switch and resistors to make fixed frequencies. 500 ps Tr and 16-160 MHz in 3 ranges so if you use 5 resistors and two switches you have 15 frequencys.

Total cost maybe 10 dollar in parts, 10 bucks for a nice cabinet so you can spend 130 dollar for another scope ;-)

Fred PA4TIM

Op 11 feb. 2013 om 21:54 heeft Dave Daniel <kc0wjn@...> het volgende geschreven:

?

This instrument was specifically discussed a while back. I'm trying to locate the emails I have; I can't recall whether it was in open forum or a series of private exchanges. The person who is selling these wanted something that he could carry around to Hamfests and other places and use to quickly evaluate 'scopes before he bought them. It looks like a very nice instrument to have, IMO.

Dave

On 2/11/2013 1:47 PM, ukchastuck wrote:

?

Anyone ever tried one of these: to test and calibrate Tek oscilloscopes? The ebay description of the Pyramid Generator implies it can be used to reliabily set vertical amplitude calibration, horizontal time calibration and triggering capabilities. Seems you get a lot for your money if it works.

Regards, Charles

?

Nice build cabinet, could be a handy tool. But strange he uses 75 Ohm bnc connectors for a 50 Ohm output. ?Also rather expensive

For that price you can make a very nice one yourself.?

Just a uProcessor to generate some squares, or maybe a Xtal and something like a 4060, for higher frequency and trigger test you add the cute little Jim williams pulser. Williams also has a schematic of a very simple timemark generator ( i do not the app note from the top of my head)

a TL431 or LT1027, a good opamp and some 1% resistors and a switch to make some accurate voltages ( a scope is 2 to 3% so this will be close enough)?

It does not matter if frequency is not in all exact steps. For a test its OK to see if the ranges still work. I think for real calibrations this is will not be enough , it only goes up to 1uS/div and for buy-checks it can do more than needed.?

If I needed one I would use this as a base :?

the Tek evaluation board we reverse engineered around 2 or 3 years ago here on the group.

And add this :? if you want use a switch and resistors to make fixed frequencies. 500 ps Tr and 16-160 MHz in 3 ranges so if you use 5 resistors and two switches you have 15 frequencys.

Total cost maybe 10 dollar in parts, 10 bucks for a nice cabinet so you can spend 130 dollar for another scope ;-)

Fred PA4TIM

Op 11 feb. 2013 om 21:54 heeft Dave Daniel <kc0wjn@...> het volgende geschreven:

?

This instrument was specifically discussed a while back. I'm trying to locate the emails I have; I can't recall whether it was in open forum or a series of private exchanges. The person who is selling these wanted something that he could carry around to Hamfests and other places and use to quickly evaluate 'scopes before he bought them. It looks like a very nice instrument to have, IMO.

Dave

On 2/11/2013 1:47 PM, ukchastuck wrote:

?

Anyone ever tried one of these: to test and calibrate Tek oscilloscopes? The ebay description of the Pyramid Generator implies it can be used to reliabily set vertical amplitude calibration, horizontal time calibration and triggering capabilities. Seems you get a lot for your money if it works.

Regards, Charles

?

This instrument was specifically discussed a while back. I'm trying to locate the emails I have; I can't recall whether it was in open forum or a series of private exchanges. The person who is selling these wanted something that he could carry around to Hamfests and other places and use to quickly evaluate 'scopes before he bought them. It looks like a very nice instrument to have, IMO.

Dave

On 2/11/2013 1:47 PM, ukchastuck wrote:

?

Anyone ever tried one of these: to test and calibrate Tek oscilloscopes? The ebay description of the Pyramid Generator implies it can be used to reliabily set vertical amplitude calibration, horizontal time calibration and triggering capabilities. Seems you get a lot for your money if it works.

Regards, Charles

----- Original Message -----

From: Bert Haskins

To: TekScopes@...

Sent: Monday, February 11, 2013 3:51 PM

Subject: Re: [TekScopes] Re: Sources for shipping cartons for vintage Tek scopes?

?

On 02/11/2013 11:16 AM, Ron Simmons wrote:

?

I have shipped over 60 ….400 series scopes all around the country. IMO the best packaging is bubble wrap. Its expensive but does the job really well.

In my career in computer peripheral sales I watched many a customer do what their packaging engineers ?called the “shake and bake” ?( temperature and shock and vibration testing) on products that they were about to purchase ( thousands of them) and ship globally. As to packaging, they said the ?best was “foam in place” where the unit sealed in plastic ?is immersed in a liquid that turns into form fitting hardened foam.? The worst protection the packaging engineers said was ?“peanuts” because they tended to shift in the box resulting in too much peanuts in one place and none in another.

As to bubble wrap, they said it was great stuff but far too expensive to use in high volume shipments. For my purposes, a good sturdy box and a scope wrapped with several layers of bubble wrap always did the job spot on

?

Does anyone know the maximum temperature for bubble wrap?
My reason for asking is that this stuff would seem to be ideal for
attic insulation but never seems to be used that way.... fire hazard???

This plus that nice 7K packing box I have stored in the attic.


Bert

?

Anyone ever tried one of these: to test and calibrate Tek oscilloscopes? The ebay description of the Pyramid Generator implies it can be used to reliabily set vertical amplitude calibration, horizontal time calibration and triggering capabilities. Seems you get a lot for your money if it works.

Regards, Charles

Raymond
The good news is that replacing the Motorola part with the Tek specified
item produces a cure & all is good again.
Probably not relevant but the Motorola part was aluminium, and
featherweight, the original part is steel and of substance. I think the
problem was junction heat related, in that there was a direct
relationship between length of 'off' time, in days, and 'on' time in
minutes, with a minimum of 1 day 'off' to get any 'on' time at all.

Thanks for all responses
regards
Chris HJ

?

This is also the symptom for a G-K short in the crt. Be careful.
-ls-

"ledlensor" rfwebb@...> wrote:
> OK, thanks. So there is a possibility.
>
> Is there any simple test I could give to the seller which might differentiate between the two?
>
> Thanks
>
> --- In TekScopes@..., David wrote:
> >
> > The hybrids are known to fail but it could also be caused by a bad DC
> > restorer which would be easy and cheap to fix.
> >
> > On Mon, 11 Feb 2013 00:04:53 +0000, Richard Webb
> > wrote:
> >
> > >Hi,
> > >
> > >Just looking at a 2465 on ebay which has ejust come up. It seems like the
> > >intensity is stuck on full brightness.
> > >
> > >I'm just wondering whether this is likely to be an easy fix? I did some
> > >googling and found someone suggesting that a similar problem might be
> > >caused by a faulty hybrid.
> > >
> > >Thanks
> >
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>