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Tektronix Cables Found

Richard Solomon
 

In my stash I came up with
two Cables, marked 010-164.

A little Googling says they are
part of a Probe P-6041 that
has two Current Transformers,
CT-1 and CT-2.

Since I have neither of those
Transformers, the cables are
maybe useful as recycled test
leads.

Anyone know the characteristics
of the coax (at least it looks like
coax) used in these cables ?

Thanks, Dick, W1KSZ

Greg Muir
 

Dick,

Do you realize that you are hanging on to a cable currently selling new through distribution for $300+? Although offers through ePay mostly for used ones are a lot cheaper.

According to the data sheet for the probes (http://www.farnell.com/datasheets/1797419.pdf) The attached probes function out to beyond 1 GHz with rise times down to 200 ps so I suspect that the cable must be exhibiting a fairly low capacity to do so.

Greg

Richard Solomon
 

I saw the prices on e-Bay for
the cables with transformers.

Didn't see any of the cables
by themselves.

Maybe I should just put them up
there and see what happens.

Thanks for the reply,

Dick, W1KSZ

On Fri, Aug 16, 2019 at 7:13 PM Greg Muir via Groups.Io <big_sky_explorer=
yahoo.com@groups.io> wrote:

Dick,

Do you realize that you are hanging on to a cable currently selling new
through distribution for $300+? Although offers through ePay mostly for
used ones are a lot cheaper.

According to the data sheet for the probes (
http://www.farnell.com/datasheets/1797419.pdf) The attached probes
function out to beyond 1 GHz with rise times down to 200 ps so I suspect
that the cable must be exhibiting a fairly low capacity to do so.

Greg



Greg Muir
 

Dick,

The offerings from distributors are poorly worded to a great extent making it rather confusing as to what the offering is.. Looking in a 1966 Tektronix catalog (yes, these things have been around for some time) on page 145 they single out the "probe" (cable) from the CT series current transformers by stating that the "probe" serves as an interconnecting cable between the current transformer and oscilloscope. And it was a jaw drop to see the prices then as compared to now:

CT-2 current transformer: $17
P6041 current probe: $12
Both together: $31

If you look on Newark, they specifically call out the P-6041 as the cable only (https://www.newark.com/tektronix/p6041/ac-current-probe/dp/11B2427) and offer the CT probes together with the P-6041 for a price in the $800 range. The current price offering as compared to the 1966 one seems to have appreciated in a manner akin to that of gold.

As to why one would give a cable the label of "probe" as well as a probe model designation is beyond me. The CT-6 is a horse of a different color and also draws a hefty price close to $1k. But it's bandwidth is good to 2 GHz.

Greg

 

I learned an interesting lesson about eBay pricing trends from the CT-1 and CT-2. Back in the first half of the new decade (approximately 2000 to 2005) the CT-1 and CT-2 sold on eBay for $25 to $35 typically. I bought a few in those years and I kept track of the prices for them in case I wanted to buy one or two more.

Economists study auctions to gain an understanding about how prices are set for goods and services. There are few constraints on prices in an auction so whenever an auction for an item is successful it matches a seller who is willing to sell an item to a buyer willing to buy it for a price they both perceive to be fair. Auctions continuously establish the fair price for an item even as people's perceptions continuously change due to surrounding conditions. Most people alive today are forced to deal with a totally different system of pricing where items have fixed prices (and price stickers to reinforce this concept) and your only choice is to take it or leave it at that price. As recently as 150 years ago in the US there were no fixed prices and everything was negotiable in the form of barter which is just a variation on an auction.

eBay brought back our ability to barter for items we wanted as was done in the 1800s. One day I saw someone list a CT-1 for a starting price of $125. I send him an email telling him he should take a look at the current prices and the completed listings to realize he overpriced his listing and he would never sell it at that price. As politely as he could he told me to piss off.

He kept relisting his current probe every week and it never sold because there were always others listed for $25-$35. Most buyers knew there was almost nothing that can go wrong with these things so why pay more for one? This went on for at least 6 months then someone bought this sellers CT-1 current probe. This probably happened because that week there were no others listed and the buyer needed it in a hurry or didn't know how to look up the price of completed listings.

Overnight the new listings for these current probes all jumped to over $100 and stayed there. This seller had forced the asking price to jump almost 4X by what he did. After a while I stopped following the prices since I was not going to pay that for something I used to pay a lot less for. Prices for these things on eBay are now off the wall. $125 would be a bargain compared to what they are asking today.

Since then I have seen the same kind of thing happen with other items. But the opposite must happen as well from time to time when the market adjusts the price down to a level where buyers see the value of something and the demand starts to pick up. At the higher price there was no demand at all.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Greg Muir via Groups.Io
Sent: Friday, August 16, 2019 10:28 PM

Dick,

The offerings from distributors are poorly worded to a great extent making it rather confusing as to what the offering is.. Looking in a 1966 Tektronix catalog (yes, these things have been around for some time) on page 145 they single out the "probe" (cable) from the CT series current transformers by stating that the "probe" serves as an interconnecting cable between the current transformer and oscilloscope. And it was a jaw drop to see the prices then as compared to now:

CT-2 current transformer: $17
P6041 current probe: $12
Both together: $31

If you look on Newark, they specifically call out the P-6041 as the cable only (https://www.newark.com/tektronix/p6041/ac-current-probe/dp/11B2427) and offer the CT probes together with the P-6041 for a price in the $800 range. The current price offering as compared to the 1966 one seems to have appreciated in a manner akin to that of gold.

As to why one would give a cable the label of "probe" as well as a probe model designation is beyond me. The CT-6 is a horse of a different color and also draws a hefty price close to $1k. But it's bandwidth is good to 2 GHz.

Greg




--
Dennis Tillman W7PF
TekScopes Moderator

Craig Sawyers <c.sawyers@...>
 

Overnight the new listings for these current probes all jumped to over $100 and stayed there. This
seller had forced the asking price to jump almost 4X by what he did. After a while I stopped
following
the prices since I was not going to pay that for something I used to pay a lot less for. Prices for
these
things on eBay are now off the wall. $125 would be a bargain compared to what they are asking today.

Since then I have seen the same kind of thing happen with other items. But the opposite must happen
as well from time to time when the market adjusts the price down to a level where buyers see the
value of something and the demand starts to pick up. At the higher price there was no demand at all.

Dennis Tillman W7PF
It is a shame that Deane Kidd is no longer with us - he could always find what I was looking for no
matter how obscure, and on a few occasions asked for no money and shipped it free of charge (to the
UK). I am sure that he would have charged a fair price for a CT1 or CT2 independently of what the
current eBay pricing was.

Craig

Greg Muir
 

Aside from two understandable factors – no knowledge of what you are selling and a little greed, it is always amusing to see the wide variance in pricing of the same item on ePay. What I don’t understand is why sellers don’t first look at the prices of what is currently listed then adjust their price accordingly.

True some of these sellers may have been taken to the cleaners when they first purchased the item (if they did) and may be trying to recoup their expenditure plus a little profit but most of them are clueless about what sort of price it may bring.

Then there is the bottom feeders. When in Colorado an engineering friend of mine purchased an item for a reasonable price being sold by the seller in a nearby town. It looked to be in good condition in the photos and the seller used that well-worn cliché “removed from a working environment” (well, maybe there were people working there at the time but the equipment was broken). Anyway he decided to save on shipping and drove over to pick it up. When he opened it on site the innards had been cannibalized of certain components. He asked the seller where he picks his items up to which the seller walked over, rolled up his garage door exposing a pile of junk. The seller replied “dumpsters.” The money paid was returned.

End of story.

Greg