开云体育

"Apparently even Tektronics was not above a well executed kludge."
Please stop this. Bad enough in ebay listings, but here?

I spoke so highly of my 571 last month. When I recently went to use it, I
was getting some artifacts in the display so I have set out to investigate.

Unfortunately you can tell this wasn't designed in Beaverton because you
have to remove the CRT to get the main board out. There are some large
Roedenstein electrolytics used for supply smoothing that have a bit of a
dome to the end of them. Not sure if these were flat when new, but they
don't appear to be leaky (neither physically nor electrically). There is
significant noise (100-200mVpp) on the supplies, but it's not line ripple.
It appears to be around 2 MHz and is two similarly disruptive pulses around
200ns out of phase.

In the process of disassembly, I have pulled and saved the three EPROM
images. Two run the 8032 controller, and one runs the NS405 "terminal on a
chip" that is used to draw the display and printer output.
I haven't exhaustively perused the images, but the graphics ROM has some
ASCII easter eggs I noticed. After the usual Tektronix copyright statement
is "Written by: Folkert ten Brummelhuis (started). Sjoerd J. Punter" and
soon after "[Makke yn Frysl?n]" which is Frisian for "Made in Friesland",
the province in which Heerenveen is situated. Later in the ROM the phrase
"Joke Mirjam Esther" appears twice, about (but not exactly) 64 bytes apart.
I believe these are three given names commonly used in the region, perhaps
the names of those endeared to one or both programmers.

Dave Casey

On Fri, Aug 21, 2020 at 1:31 PM Dave Casey via groups.io <polara413=
[email protected]> wrote:

I stand corrected; can confirm, my S/N also starts with H. Thanks!

Dave Casey

On Fri, Aug 21, 2020 at 5:12 AM zenith5106 <hahi@...> wrote:

On Fri, Aug 21, 2020 at 05:49 AM, Dave Casey wrote:

Built by Sony-Tektronix.

No,not Sony-Tek. It was built by Tek Netherlands (SN begin with H) and as
far as I remember it was also designed by them.

/H?kan

It's like Uber for scopes! If I ever find a 570 and can't retrieve it myself, I'll keep you in mind!
-Dave
On Wednesday, September 23, 2020, 03:32:29 PM PDT, Richard R. Pope <mechanic_2@...> wrote:
Hello all,
And this is why I offer a premium delivery service. Expensive but
the equipment is handled by just me. It will not be dropped, spindled,
nor mutilated and it is kept in a climate controlled environment. I
will pick up anywhere in the lower 48 and deliver to anywhere else in
the lower 48. Please contact off list for details?
GOD Bless Bless and Thanks,
rich!

On 9/23/2020 4:38 PM, John Williams wrote:

Good advice. Having shipped and received literally hundreds of tube scopes, there is always a few things overlooked. One that is ALWAYS overlooked is the crt. The crt in these old scopes is supported in only two places, that is the front panel and the rear socket. The front support is very rigid. The back support however is usually a white plastic ring that may be used to rotate the tube. Sadly this plastic is the kind that eventually hardens. It does not take much force to break it. Even time can cause it to fail. Now when the packed scope gets dropped by the carrier, and it WILL get dropped, the crt is unsupported and will usually break in half at the neck. All carriers use conveyor belts, and a package this size sometimes falls off the conveyor to the concrete floor. I have even seen the UPS driver, when picking up a box clearly marked fragile in 10 places actually THROW the box into his truck. CRTs are getting very hard to find, so if yours gets broken the whole scope may be junk.

I have also received scopes in their original Tektronix shipping box, unopened. There is no way this box could survive shipping conditions today. It always has to be packed inside another box.

I know of no easy answer to this. I have sometimes removed the crt and packed it separately in a proper Tektronix crt box. This is good but increases the cost. I have also received scopes with some packing material around the crt inside the mu-metal shield. As I recall this had limited success. Oh and btw no carrier will insure glass.

Any time you ship it is a crap shoot. All you can do is try to make sure your package can be dropped 6 feet onto concrete and you are ok. Maybe. Good luck.

I

Good advice. Having shipped and received literally hundreds of tube scopes, there is always a few things overlooked. One that is ALWAYS overlooked is the crt. The crt in these old scopes is supported in only two places, that is the front panel and the rear socket. The front support is very rigid.? The back support however is usually a white plastic ring that may be used to rotate the tube. Sadly this plastic is the kind that eventually hardens. It does not take much force to break it. Even time can cause it to fail. Now when the packed scope gets dropped by the carrier, and it WILL get dropped, the crt is unsupported and will usually break in half at the neck. All carriers use conveyor belts, and a package this size sometimes falls off the conveyor to the concrete floor. I have even seen the UPS driver, when picking up a box clearly marked fragile in 10 places actually THROW the box into his truck. CRTs are getting very hard to find, so if yours gets broken the whole scope may be junk.

I have also received scopes in their original Tektronix shipping box, unopened. There is no way this box could survive shipping conditions today. It always has to be packed inside another box.

I know of no easy answer to this. I have sometimes removed the crt and packed it separately in a proper Tektronix crt box. This is good but increases the cost. I have also received scopes with some packing material around the crt inside the mu-metal shield. As I recall this had limited success. Oh and btw no carrier will insure glass.

Any time you ship it is a crap shoot. All you can do is try to make sure your package can be dropped 6 feet onto concrete and you are ok. Maybe. Good luck.

I

On Sep 23, 2020, at 12:44 AM, Thomas Garson <tgarson@...> wrote:

?My "new to me" TWD120 arrived today. Thank you Charlie.

As Charlie advised in previous email, it did not pass self test, leaving the front panel LED unmistakably solid red.

However, the repurposed IBM laptop external power supply worked admirably so I dove into it.

After removing a number of screws and a cal sticker, I was presented with a single nice and compact SMD loaded PCB. No out-sourced PWM supplies for Tek. The regulator circuitry occupies a compact "can" in one corner.

As I was working w/o a schematic I had to find supply lines on some chips to check voltages. Voltages were good, but one was a bit noisy. DC to DC portion of supply looked good on (Tek 5000) scope. After sniffing around a bit (figure of speech. It did not smell) I noticed several Motorola T10N05e TO-263 type SMD packages near the supply wall, but outside of it. At first I was puzzled as I could find these parts for sale but no data sheet. Figured out they were N-channel power mosfet. I determined they were used for gates to enable/disable DC power feeding from the supply. Interesting. Squinting trough my trusty Swiss Army Knife magnifier (glass lens!) I noticed serious corrosion on the Source solder connection of one of those FETS (Q104: +8v line), which I theorized may have been the source of the noise I has seen. Reflowed the funky joint. Kicked on the power, waited a minute or so for self test to complete: Bingo! LED now turns Green!

That's as far as I got today. Next thing is I have to pull the software for it off of the floppy discs (fingers crossed) for copying over to the server and then burn a back up disk. After that, get my Win98SE PC set up with SCSI (not too big a deal as I used to do a lot of SCSI stuff) and see if I can actually get the thing to work. At the moment, I'm fairly optimistic this will happen in short order.

A few photos here:


Thomas Garson
Aural Technology, Ashland, OR
By my calculation, the dynamic range of the universe is roughly 679dB,
which is approximately 225 bits, collected at a rate 1.714287514x10^23 sps.

Good advice. Having shipped and received literally hundreds of tube scopes, there is always a few things overlooked. One that is ALWAYS overlooked is the crt. The crt in these old scopes is supported in only two places, that is the front panel and the rear socket. The front support is very rigid. The back support however is usually a white plastic ring that may be used to rotate the tube. Sadly this plastic is the kind that eventually hardens. It does not take much force to break it. Even time can cause it to fail. Now when the packed scope gets dropped by the carrier, and it WILL get dropped, the crt is unsupported and will usually break in half at the neck. All carriers use conveyor belts, and a package this size sometimes falls off the conveyor to the concrete floor. I have even seen the UPS driver, when picking up a box clearly marked fragile in 10 places actually THROW the box into his truck. CRTs are getting very hard to find, so if yours gets broken the whole scope may be junk.

I have also received scopes in their original Tektronix shipping box, unopened. There is no way this box could survive shipping conditions today. It always has to be packed inside another box.

I know of no easy answer to this. I have sometimes removed the crt and packed it separately in a proper Tektronix crt box. This is good but increases the cost. I have also received scopes with some packing material around the crt inside the mu-metal shield. As I recall this had limited success. Oh and btw no carrier will insure glass.

Any time you ship it is a crap shoot. All you can do is try to make sure your package can be dropped 6 feet onto concrete and you are ok. Maybe. Good luck.

I

There is a seller on ebay that has several 22xx covers at a reasonable price of ~ $30 each, and even sensible shipping that to me in FL shows up as $5.

He specifically states that "it will fit a 2213, and a 2225".

324227818105








.

Here's a page on a fabulous, late 570 I sold into Japan in 2000:



and here's a page detailing the crate I made to get there in one piece:



And, just for fun, a page of pix of the internals:



Bill @ PEARL, Inc.

Fedex and UPS pack things fairly well, I have not had any damage.
It can be pricey, but is usually less then traveling to pick something up.
Some people offering equipment demand that you pick it up from them. I
have accounts with both Fedex and UPS, that allows me to take care of
everything from my end and convince reluctant sellers to take items to
the stores. I ask everyone who demands pickup only to reconsider and be
willing to take the item to a shipper who will take care of the packing
and shipping.

Bruce Gentry, KA2IVY

On 23Sep, 2020, at 8:30 AM, Bill Riches via groups.io <bill.riches@...> wrote:

Depending on how many boxes you need check out Uline.? They have double wall boxes of all sizes.? Staples have some boxes that are better than the Amazon boxes.
73,
Bill, WA2DVUCape May, NJ
? ? On Wednesday, September 23, 2020, 10:26:12 AM EDT, Adam Beasley <abeasley@...> wrote:

Is there a good service to use to ship scopes?? The only boxes I have available are from Amazon and they are not very sturdy so I wouldn't trust shipping something heavy and expensive in them.

Thanks,
Adam

From: "stevenhorii" <sonodocsch@...>
To: [email protected]
Sent: Wednesday, September 23, 2020 12:43:55 PM
Subject: Re: [TekScopes] Shipping Scopes

If I can, I pack items myself and take them to UPS or FedEx for shipping.
Double-wall boxes are available at Home Depot and Lowes. They are usually
in the “moving supplies” aisle.

On 23Sep, 2020, at 8:30 AM, Bill Riches via groups.io <bill.riches@...> wrote:

Depending on how many boxes you need check out Uline. They have double wall boxes of all sizes. Staples have some boxes that are better than the Amazon boxes.
73,
Bill, WA2DVUCape May, NJ
On Wednesday, September 23, 2020, 10:26:12 AM EDT, Adam Beasley <abeasley@...> wrote:

Is there a good service to use to ship scopes? The only boxes I have available are from Amazon and they are not very sturdy so I wouldn't trust shipping something heavy and expensive in them.

Thanks,
Adam