Date   

Re: Buying Tek equipment on eBay or on Swap meets

-
 

I don't know about FedEx or UPS but the local electronics companies near
me all use the foam in place machines and they are very effective at
preventing damage to electronic equipment. I'm surprised that UPS and Fedex
don't use those. That would be something that the shipper really needs to
check on before paying FedEx, UPS or anyone else to package an item. OTOH
not even foam in place is going to prevent damage if UPS drives a forklift
fork through the box, or prevent breaking the neck of a CRT if a careless
handler drops the package from several feet in the air.

My strong opinion is that if you want to buy these big heavy old scopes,
then you need to be willing to drive and pick them up in person, regardless
of the distance.

On Wed, May 5, 2021 at 11:16 AM Michael W. Lynch via groups.io <mlynch003=
yahoo.com@groups.io> wrote:

On Wed, May 5, 2021 at 09:35 AM, - wrote:


you could have the seller
drop the bare item off at UPS or FedEx and, for a fee, they will pack it
and ship it to you. Beware the fee though! The last time that I did that,
UPS charged me $100 just to box up a HP 9826 computer and that was at
least
20 years ago! If you're going to have equipment sent to you, you might
also consider getting some very well built boxes and sturdy foam that the
TE will fit into and then ship the box and the packaging to the seller so
that they can pack the TE into it and then return it to you.
Good suggestions for finding equipment.

On the other hand, Having Fed Ex or UPS "pack" any CRT scope is a real
risk of total destruction. Many such stores are clueless about how to pack
a heavy and fragile scope. If they do it right, it is going to cost a
fortune. I recently had a 475 shipped to me for repair. It was packed by
those "experts". The scope had two layers of bubble wrap and a few scoops
of packing peanuts, that is it. The owner said that they charged him $40
to "pack" the scope. The scope was actually sliding around in the box as
you moved it. The only thing that saved the knobs was the fact that they
left the handle up so the handle stopped the knobs from hitting the end of
the box. Miracle was that the scope was not otherwise damaged.

I would agree that you would be better off sending a proper box, packing
materials and instructions for the seller to use to ship the instrument.


--
Michael Lynch
Dardanelle, AR






Re: Buying Tek equipment on eBay or on Swap meets

Michael W. Lynch
 

On Wed, May 5, 2021 at 09:35 AM, - wrote:


you could have the seller
drop the bare item off at UPS or FedEx and, for a fee, they will pack it
and ship it to you. Beware the fee though! The last time that I did that,
UPS charged me $100 just to box up a HP 9826 computer and that was at least
20 years ago! If you're going to have equipment sent to you, you might
also consider getting some very well built boxes and sturdy foam that the
TE will fit into and then ship the box and the packaging to the seller so
that they can pack the TE into it and then return it to you.
Good suggestions for finding equipment.

On the other hand, Having Fed Ex or UPS "pack" any CRT scope is a real risk of total destruction. Many such stores are clueless about how to pack a heavy and fragile scope. If they do it right, it is going to cost a fortune. I recently had a 475 shipped to me for repair. It was packed by those "experts". The scope had two layers of bubble wrap and a few scoops of packing peanuts, that is it. The owner said that they charged him $40 to "pack" the scope. The scope was actually sliding around in the box as you moved it. The only thing that saved the knobs was the fact that they left the handle up so the handle stopped the knobs from hitting the end of the box. Miracle was that the scope was not otherwise damaged.

I would agree that you would be better off sending a proper box, packing materials and instructions for the seller to use to ship the instrument.

--
Michael Lynch
Dardanelle, AR


Re: 577 D2 question(s)

Eric
 

Andy tubes are really available for the 577 d2 they can be salvaged from
one of the 5000 series scopes. If I remember correctly the 5220 is the one
you want to find. It is a direct drop in replacement I can confirm the
scope later today of need be.

Eric

On Wed, May 5, 2021, 11:05 AM Andy Warner <andyw@pobox.com> wrote:

Thanks all,
I was hoping it would not be the tube, I have been lucky enough to
avoid that on my other Tek gear.
I'll take a pass at the HV board first, but it sounds like I likely have a
poisoned cathode.

Any reason I should not try a full rejuvenation - including applying some
current limited HT between cathode and grid, or is there a reason you
suggested just overdriving the heater, Bob ?

From the serial #, my unit has the 154-0633-10 tube, which appears to be
unobtainium - sigh.

On Tue, May 4, 2021 at 10:33 AM <robeughaas@gmail.com> wrote:

The symptom is known as "double peaking" and indicates the CRT has
cathode
interface, AKA cathode poisoning. The CRT is near the end of its life.
Applying 12 volts for 10 or 15 minutes to the filament (with the
instrument
power off, since, in operation, the filament is at -3400 volts), may
effect
a temporary repair. Access to the filament is easy via a two-pin
connector
on the HV/deflection board.

--
Bob Haas





--
Andy






Re: 577 D2 question(s)

Andy Warner
 

Thanks all,
I was hoping it would not be the tube, I have been lucky enough to
avoid that on my other Tek gear.
I'll take a pass at the HV board first, but it sounds like I likely have a
poisoned cathode.

Any reason I should not try a full rejuvenation - including applying some
current limited HT between cathode and grid, or is there a reason you
suggested just overdriving the heater, Bob ?

From the serial #, my unit has the 154-0633-10 tube, which appears to be
unobtainium - sigh.

On Tue, May 4, 2021 at 10:33 AM <robeughaas@gmail.com> wrote:

The symptom is known as "double peaking" and indicates the CRT has cathode
interface, AKA cathode poisoning. The CRT is near the end of its life.
Applying 12 volts for 10 or 15 minutes to the filament (with the instrument
power off, since, in operation, the filament is at -3400 volts), may effect
a temporary repair. Access to the filament is easy via a two-pin connector
on the HV/deflection board.

--
Bob Haas





--
Andy


Re: Plastic Part for a 3L5

Michael W. Lynch
 

Post a picture, If it is like the ones that Dave is describing from the 7B53, it would be a simple task to turn out the part from nylon on a lathe. if supplied the dimensions and pictures, I could probably make one from nyl0n stock or model one and 3D print it. I looked in the TEK "Mechanical parts" catalog, but did not see this part listed along with the other shaft couplings.

--
Michael Lynch
Dardanelle, AR


Searching for 2247A Front Foot

Wayne
 

I recently acquired a just-like-new 2247A from a friend that was a long-time Tek employee. It has had very little use, and you cannot tell it from a new one fresh out of the box except for one missing part. The only flaw in the entire scope, cosmetically or functionally, is one of the black polyurethane front feet is missing, 348-0659-00. As far as I have found so far, this part number was used only on the 2245A and 2247A The 2246 parts list shows the foot, but no part number, and the description says "Not replaceable at this time". The part was made by a company called Triquest according to the Tek manual, but a web search indicates they must be out of business.

The "further-down-the-line" 22xx scopes I looked at use a different part number. Wondering if anyone has a 2245A or 2247A parts mule that might be willing to sell me a foot to put this beautiful machine back into absolutely pristine condition.

Thank you!
Wayne


Re: Buying Tek equipment on eBay or on Swap meets

-
 

I'm on the opposite side of the country but don't you have some sea ports
there and a navy base? (Also large airports and/or universities) If so then
I can guarantee that there are a lot of civilian companies near them that
support them and that have very sophisticated TE and that also frequently
discard their old equipment for newer models. Seek out those companies,
see if they have surplus disposal auctions and also see if they just send a
lot of the TE and other electronics to electronic disposal companies for
recycling. Seek out those disposal companies see if they will sell any of
the "scrap" to you. It's not like shopping at Sears where you can go in
and pick the exact model that you want, it's more like digging for car
parts in an automotive junk yard, but can guarantee that you will find and
then *want* things that you never imagined! You have to persistent and
probably have to visit them over and over and over so be friendly to them
and *respect* their property and equipment and don't leave a mess behind or
they won't let you return. They never know what is coming in in advance so
you need to visit them over and over again, so I said, stay on GOOD terms
with them.

IMO shopping on Ebay is for people that are too LAZY to go out and look
for the items that they want. It's more convenient and you won't have to
get your hands dirty but it is expensive. OTOH when you start getting into
really specialized TE such as HP 3458 meters, then you're probably not
going to find one locally and you may have to resort to E-Greed. But hang
onto your wallet if you do!

Also have you tried placing WANT ads on Craigslist, Facebbook
Marketplace or in the newspapers not only in your town but everywhere
within driving distance? Years ago, even before E-bay, a friend of mine
installed an incoming 1-8oo number on his phone line. Then, even though he
lived several states away, he placed I-want-to-buy-HP want ads in all of
the newspapers surrounding several of HPs biggest US manufacturing plants.
He had hundreds and hundreds of calls from people who had worked at HP, or
one of their family members had, and they all had HP items that wanted to
sell. He had an account with UPS at the time so he would buy their items
and have them drop them at UPS and UPS would send them to him. The key to
his operation was to make it as simple and as easy and as cheap as possible
for the sellers to sell and send their stuff to him. No E-bay, no PayPal,
no (then very expensive) long distance phone calls. Just call his 800
number, tell him what you had and if you made a deal, then drop the item at
UPS and he would send you a check or money order. If you're willing to
drive and pick up the item in person, then I think that this approach would
be extremely effective for buying from people that have old big heavy TE
that they don't want to test or have to box up and ship. IMO you would be
MUCH better off picking scopes up in person since you could be sure that
they didn't get damaged in shipping and avoid the expensive packing and
shipping fees. Buf it that is impossible, then you could have the seller
drop the bare item off at UPS or FedEx and, for a fee, they will pack it
and ship it to you. Beware the fee though! The last time that I did that,
UPS charged me $100 just to box up a HP 9826 computer and that was at least
20 years ago! If you're going to have equipment sent to you, you might
also consider getting some very well built boxes and sturdy foam that the
TE will fit into and then ship the box and the packaging to the seller so
that they can pack the TE into it and then return it to you.

On Wed, May 5, 2021 at 8:54 AM Lawrance A. Schneider <
llaassllaaass@gmail.com> wrote:

I live in the willy-wags of Maine. About the only way go getting anything
is ebay or CraigsList. If someone else lives in Maine, I'd like to know
how they (you) get anything without resorting to the above.

Thanks, larry






Re: Buying Tek equipment on eBay or on Swap meets

Oz-in-DFW
 

It's pretty clear that eBay has had a significant impact. The volume of stuff sold there is so great, it can't *not* have had an impact. Dayton nee' Xenia is a good example. Before eBay it had several folks selling recent vintage HP and Tek. With the advent of eBay that dwindled to nothing over less than five year. I still see stuff at the local fests, but the nature of the content is now largely floor sweepings.

There are certainly other significant effects - the aging of the ham radio hobby, liability and venue cost, etc. but eBay is a major factor.

--
Oz (in DFW) N1OZ


Re: Upcoming changes to our PayPal legal agreements

-
 

Do you mean that Tek *isn't* a division of PayPal??

On Wed, May 5, 2021 at 8:20 AM Rick <rpbale@gmail.com> wrote:

I didn't Paypal was a division of Tek






Re: Tektronix Probe Replacement Parts and Accessories

Lawrance A. Schneider
 

On Tue, May 4, 2021 at 11:00 AM, Dennis Tillman W7pF wrote:


I created this list because I have a lot of probes. Since I have all of the
7000 and 5000 series plugins as well as many TM500/TM5000 plugins all these
probes are necessary to use the plugins.
If COVID ever ends and I ever make it out of Maine and to the opposite side of the USA, I hope to somehow see your collection. It would be the fulfillment of a boyhood dream; I can't remember the first 'tekscope' I ever saw, but I'll bet I drooled. I would hope that were the 'fulfillment' to come to pass, I would not drool.

Good for you Dennis, larry


Re: Buying Tek equipment on eBay or on Swap meets

Lawrance A. Schneider
 

I live in the willy-wags of Maine. About the only way go getting anything is ebay or CraigsList. If someone else lives in Maine, I'd like to know how they (you) get anything without resorting to the above.

Thanks, larry


Re: Upcoming changes to our PayPal legal agreements

Rick
 

I didn't Paypal was a division of Tek


Novice X-Y Problem 2265

Alan Young <agyoung@...>
 

Hello all,
I am trying to use a 2246 for monitoring a two tone input in ch1 and 2 to look at the beat pattern of a transmitter.
When in X-Y mode I don’t see anything. If I push the beam finder I see the two dots all the way to the left and have superimposed them. The test setup is a demodulation signal from the tap to X and the Y is the RF sampler out. The device has a trigger port for triggering, using ch 3 for the trigger. When the transmitter is keyed and beam finder pushed in I can see vertical deviations of the demod signal but no movement in time. Without pushing in the beam finder I see nothing. I haven’t used a scope in 40 years, last one used was a 465.
Any thoughts would be helpful, and thanks in advance.

Alan
N5AGY


Re: FG504 pricing

 

I'm the enquirer, not Dennis. If you're in the UK please PM me.

David

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of SMOSborne@centurylink.net
Sent: 05 May 2021 04:01
To: TekScopes@groups.io
Subject: Re: [TekScopes] FG504 pricing

Dennis,

I have an FG504 that is working that I no longer want/need and would be willing to sell at a reasonable price. Contact me off list if you are interested.


Re: Scope camera weight

stevenhorii
 

There were camera bezel attachments for the various Tek scopes. I bought a
7704A that had a camera bezel on it (but no camera). My recollection (that
7704A went off at a hamfest years ago) is that the camera bezel was metal
and had a hinge where the camera would attach. The camera could be swung
out of the way for observation and swung in and latched for photos. The
7704A has grooves on the sides of the standard bezel into which the camera
bezel slid. This is all from memory which may be a little "dusty". This
arrangement to me suggests that the bezel on a 7704A can take quite a bit
of weight.

On Tue, May 4, 2021 at 1:16 PM Dave Seiter <d.seiter@att.net> wrote:

Marion,
I just put a c-53 on my shipping scale; it's 5lbs, 11oz. Center of mass
feels like it's about in the middle, so about 4.5"?
-Dave
On Tuesday, May 4, 2021, 10:06:49 AM PDT, Marian B <public@enkore.de>
wrote:

Hello TekScopes!

I've been finally getting around to making (or planning, anyway) a proper
camera mount for my Tek scopes. My main concern is if it's mechanically
O.K. to hang a camera on the front of my 7000-class ships (not
boat-anchors).

At the closest I can get to the CRT with my current camera + lens combo I
would end up hanging ~1.3 kg (2.9 lbs) onto the faceplate, with the center
of mass being ~24 cm (~10 in) in front of the scope. This seems awfully
heavy to me with a lot of leverage.

I searched for the weight of the C-50/51/52/53 series cameras which were
meant to go on these scopes, but didn't find it in the manuals. How do
these compare, mass and center of mass wise?

(I also own a 2246, but the attachment slot is out of thin plastic on
those, so I doubt hanging anything other than a hood on that is a good
idea)

Cheers, Marian











Tek 465

Dr. Manfred K. Zeller
 

"Y shift from channel 1 move only in the upper part of the screen vertically?"
A part is out of screen.
Amplifier discret version.
Power supply ok
Manual there
Serial B011126
Channel 2 is ok.
Thank you!
Manfred


Re: Repairing a 7704A - No Read-out...

Ulf Kylenfall
 

Several signals that should be present from interface boards
were not present. Scope will be used for spare parts...


P6006 style probes...loose connection at the BNC?

Sean Turner
 

Hi folks,

Recently I got me a beautiful Type 547, cart, and all kinds of goodies at an estate sale. Naturally it makes a good home for the Type 1A4 plug in I already had, and it came with one P6006 probe. I got two more P6006 recently (need to find a fourth!) but one one of these new ones has an intermittent connection going on near the BNC, Is there any way to get under the strain relief to fix it there, or is it hosed?

Thanks,

Sean


Re: Tek 465B Diagnosis Comments Requested #photo-notice

 

Glad to hear that you fixed the problem!

The sheet metal cover is easy to assemble incorrectly, and a number of 475s that I have handled (whose construction is almost identical to the 465) had their sheet metal covers assembled in various wrong ways. I don't entirely understand your fix, but you may have simply restored the cover to its correct configuration. It certainly should NOT have been pressing on the attenuator blocks.

These scopes can be operated with both 1X and 10X probes, which is why they have a probe readout sense ring (you're cheap Chinese probes almost certainly don't have a readout sense pin, so the vertical gain range lamps will be lit incorrectly, but that's merely an inconvenience). However, a 1X probe (or a 1X/10X probe in 1X mode) has very different bandwidth characteristics than a 10X probe (or a 1X/10X probe in 10X mode). In almost all cases you will want to have your probe set to 10X, unless you need the increased sensitivity of 1X mode, and can accept the drastically lower bandwidth.

-- Jeff Dutky


Re: Tek 465B Diagnosis Comments Requested #photo-notice

 

Thank you. But this response came too late. I have already buttoned up the project, calling it finished. Now that I know those little rectangular white plastic blocks are actually easily removed, I "fixed" my problem another way. I had already cleaned the contacts, best as I could with those blocks in the way. Here was the problem: I noticed that both channels behave more or less the same way when my cheap chinese probes are set to 10X, when the sheet metal cover of channel 1 was off. But as soon as I tried to put the little sheet metal cover back on, the trace would get pointed and noisy again. That cover is a snap-on arrangement, and it was squeezing together the metal sides of the attenuator mounting bracket. So what it did was bend one of the flanges of the cover outwards out so it didn't squeeze and snap on. Now it is only held in place by the 5 little screws. Now both channels behave almost perfectly identically. What i also learned was this scope doesn't like when you set the switch the probes to 1X. Apparently the correct way to operate this scope is with the probes set at 10X all the time. I believe I like this scope better than my 2215, even though my 2215 is light as a feather and works absolutely perfectly. This 465B has the DM44 volt/ohmeter on top. From what I read, it has a 10meg impedence on the voltmeter, which means you can use it as a VTVM. Is that true? Thank you. PS: this 465B is a sweet machine.

6121 - 6140 of 188158