Re: 7T11 horizontal memory
Hi Chris,
One more suggestion. Set the 7T11 for MANUAL scan. Set the test scope at 5 or 10 us/div, trigger from the 7T11 pulse output. Then probe all TPs 512, 515, 525, 555 of the horizontal amplifier. In each period you will see one horizontal line at a level determined by the SCAN knob setting. The level increases from ground to some maximum when you rotate SCAN from left (ccw) to right (cw). The amounts and ratios depend on the setting of the 7T11 time/div within its range. At TP555 the maximum should always be 5 V.
Albert
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On Mon, Dec 3, 2018 at 05:13 PM, Albert Otten wrote:
Hi Chris,
It's not so easy to interpret the graphs 26 and 27 the correct way. The shaded
area in 26 actually consists of horizontal lines, the value of which are
sampled when the memory gate conducts. In 27 something similar for the rest
period between end of hold-off and next trigger event.
When probe TP555 at a slow sweep speed, 5 ms/div, trigger from this signal and
play with the SCAN rate of the 7T11, you can get a more or less stable
display. You will recognize the 7T11 sweep as a rising envelope with an
amplitude of 5 V. The output at TP564 is a nice 2X inverted, down going sweep
signal with amplitude 10 V. TP556 shows about the same as TP564 but with small
amplitude.
Albert
On Mon, Dec 3, 2018 at 01:06 PM, cmjones01 wrote:
Now I have healthy gate pulses at the collector of Q546. However, I don't have
any sweep at TP555 in equivalent time mode. Need to look in to this next.
Chris
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Re: Tektronix 475A intermittent / lazy sweep
Hi, From my information, it is actually the Coulsdon Amateur Transmitting Society, not Crawley. The URL below gets you to the CATS Bazaar and there are links:
I, too have no association with the event, but I think I might try to visit next year....
Colin.
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of george edmonds via Groups.Io Sent: 23 November 2018 23:59 To: [email protected]Subject: Re: [TekScopes] Tektronix 475A intermittent / lazy sweep Hi All The CATS (Crawley Amateur Transmitting Society) rally is correctly known as the CATS Bazaar, it was not last month but is was held on the 15th November. If you are into Amateur Radio or T&M kit it is a must go to event. Just for the record I have nothing to do with the organising of the event. 73 George G6HIG On Friday, November 23, 2018 8:35 AM, Tom Gardner <tggzzz@...> wrote: On 23/11/18 06:18, Brian Cockburn wrote: At the CATS rally (South London) ... I'm in Cambridge but I'm not familiar with 'CATS Rally'. Googling didn't turn up anything non-feline. Could you elaborate a bit pleas
The canonical source for these rallies is Since the Couldson (Surrey) rally was last month, it no longer appears there.
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i have a couple of 2465B A5 boards for sale. These are the SMD version and will work in the 2445B, 2455B, 2465B, and 2467B scopes with serial # greater than B05XXXX. They have new socketed NVRAM modules and have had the electrolytic capacitors replaced. These boards have absolutely no damage on them from leaking electrolytic capacitors. Fully tested. $300 each shipped USPS Priority Mail to US 48 states. PayPal accepted.
Manuel W4SSB
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Re: FS: miscellaneous Tektronix manuals
Hi Dan,
I can help you test tubes on your 575.
Like you I was very impressed with George Lydeck's (Glydeck) creativity and when a 575 fell into my lap for $20 it acted as a catalyst for me to build an adapter to test tubes. I went one step further than George: I came up with a way to test any tube on a 575, 576, 577, 7CT1N or 5CT1N.
You can read about how you can do it in my paper which you can download at
If you want to get one of my adapter boards please contact me off list at dennis at ridesoft dot com.
Dennis Tillman W7PF
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-----Original Message-----
From: Dan Cordova via Groups.Io
Sent: Tuesday, December 04, 2018 1:52 PM
Subject: Re: [TekScopes] FS: miscellaneous Tektronix manuals
Hi Brad,
Do you have or know anyone selling an adapter/fixture to match tubes on
a Tektronix 575?
Or, do you know if there is a schematic I can buy? Glydeck has a blog
about this, but there is no schematic or info to contact him.
Thanks,
Dan -- Dennis Tillman W7PF TekScopes Moderator
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Re: FS: miscellaneous Tektronix manuals
Hi Brad,
Do you have or know anyone selling an adapter/fixture to match tubes on a Tektronix 575?
Or, do you know if there is a schematic I can buy??
Glydeck has a blog about this, but there is no schematic or info to contact him.
Thanks,
Dan
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On Tuesday, December 4, 2018, 1:31:54 PM PST, Brad Thompson <brad.thompson@...> wrote:
Hello--
I'm offering FS the following original Tektronix manuals-- all are in
very good condition
except as noted. Please note that some of these manuals are available
for downloading at no cost. However, some users prefer printed copies.
Postage is extra (except as indicated).
Scope-mobile 200-1 062-0870-00, May 1969 (R), 8 pp. double-sided. $3.00
postpaid via USPS first-class mail.
*
4957 Series Graphics Tablet Instruction Manual, 070-4784-01, Product
Group 15, Nov.1986 (revised); approx. 72 pp., in 9-inch by 7-inch three-ring
binder. $7.50 plus postage.
*
TDS 200-series Programmer Manual, 071-0493-01, approx. 220 pp., wire-bound,
in as-new condition. Asking $10.00 plus postage
Note1 : "This document supports TDS 210 and TDS 220 with FV:v1.09 and
above when used with TDS2CM version CMV:v1.04 and above, or TDS2MM any
version, and TDS224 when used with any version of TDS2CM or TDS2MM."
Note 2: Requires an optional RS-232 or GPIB interface (TDS2CM Communications
Extension Module or TDS2MM Measurement Extension Module).
*
11401 and 11402 Programmers Quick Reference, 070-6255-00, Product Group 47,
1988 first printing. approx. 80 pp., wire comb-bound (9-inch by 4-inch
format),? In very-good-minus condition (front cover creased). Asking
$7.50? plus postage.
*
DSA 601A and DSA 602A Digitizing Signal Analyzers Quick Reference,
070-8183-00,
Product Group 47, 1991 first printing. approx. 60 pp., wire comb-bound
(9-inch by 4-inch format),? In good-plus condition (front cover creased,
wire comb? slightly distorted).
Asking $7.50? plus postage.
*
P6231 10X Active Probe, DC to 1.5 GHz, Instruction Manual, 070-6027-00
Product
Group 60, revised 1987, (8 1/2 inch by 5 1/2 inch plastic comb binding)
approx 40 pp.
In very good condition (front cover slightly faded)? Asking $7.50 plus
postage.
****
Question welcomed, PayPal honored.
thanks, and 73--
Brad? AA1IP
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Re: OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
How about plastic ice cube trays ?
HankC, Boston, Wa1HOS
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Re: What is this soft metal, and is it toxic?
Hi John:
Did you find out what it was?
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FS: miscellaneous Tektronix manuals
Hello--
I'm offering FS the following original Tektronix manuals-- all are in very good condition
except as noted. Please note that some of these manuals are available for downloading at no cost. However, some users prefer printed copies. Postage is extra (except as indicated).
Scope-mobile 200-1 062-0870-00, May 1969 (R), 8 pp. double-sided. $3.00 postpaid via USPS first-class mail.
*
4957 Series Graphics Tablet Instruction Manual, 070-4784-01, Product
Group 15, Nov.1986 (revised); approx. 72 pp., in 9-inch by 7-inch three-ring
binder. $7.50 plus postage.
*
TDS 200-series Programmer Manual, 071-0493-01, approx. 220 pp., wire-bound,
in as-new condition. Asking $10.00 plus postage
Note1 : "This document supports TDS 210 and TDS 220 with FV:v1.09 and above when used with TDS2CM version CMV:v1.04 and above, or TDS2MM any version, and TDS224 when used with any version of TDS2CM or TDS2MM."
Note 2: Requires an optional RS-232 or GPIB interface (TDS2CM Communications
Extension Module or TDS2MM Measurement Extension Module).
*
11401 and 11402 Programmers Quick Reference, 070-6255-00, Product Group 47,
1988 first printing. approx. 80 pp., wire comb-bound (9-inch by 4-inch format), In very-good-minus condition (front cover creased). Asking $7.50 plus postage.
*
DSA 601A and DSA 602A Digitizing Signal Analyzers Quick Reference, 070-8183-00,
Product Group 47, 1991 first printing. approx. 60 pp., wire comb-bound (9-inch by 4-inch format), In good-plus condition (front cover creased, wire comb slightly distorted).
Asking $7.50 plus postage.
*
P6231 10X Active Probe, DC to 1.5 GHz, Instruction Manual, 070-6027-00 Product
Group 60, revised 1987, (8 1/2 inch by 5 1/2 inch plastic comb binding) approx 40 pp.
In very good condition (front cover slightly faded) Asking $7.50 plus postage.
****
Question welcomed, PayPal honored.
thanks, and 73--
Brad AA1IP
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Re: Large lot of Tek equipment for sale
Q: How many 'scopes does one person need? A: "Just ONE more"!
de G4LUA
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Re: What is this soft metal, and is it toxic?
I have a 250g ingot of pure Indium. It was purchased during the developement phase of a 500W Band II amplifier module, to see if it could be formed into thermally-conductive washers (RF transistor flange to heatsink interface). The answer was no: despite being very soft, it was not soft enought to flow at the pressures involved in bolting down the transistors. Gram for gram it's close to silver in cost. Perhaps I should make up some solder for use on gold connections?
John
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Re: OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
On Tue, 04 Dec 2018 04:36:40 -0800, you wrote: If you want, you can color code the envelopes with colored dots from a stationary store, or colored labels. And for the OT? If someone talks about spectrum analyzers, I'm not the right person. Logic analyzers, yes. OT? likely anything. Harvey Hello all,
Thank you everybody for all your valuable input.
I can't possibly summarize everything in an answer, or quote or give appropriate credit to each method, but - in general...
I started with this idea to categorize the transistors in a way that their physical placement would somehow reflect their key characteristics... all that in order to save space and minimize the number of separate "compartments"...
But in the light of all your answers - the idea of the plastic bags or coin envelopes catch my attention the most - I got convinced that it's not all that difficult to really have the transistors separate by individual part numbers.
The bags (or coin envelopes) don't take much space, are cheap, and allow to keep the parts organized, without the need of having that many number of compartments (the envelopes become the compartments).
The discussion about being anti-static or not, well, I`m in Sao Paulo (Brazil) and humidity is usually not lower than 50% so, static is rarely an issue here.
Still, I`ll look for anti-static bags and, if they're affordable, it will be my preferred choice.
Thank you again and Rgrds,
Fabio
P.S. It seems the more OT the subject is, the more it grabs the group's attention and triggers more collaboration than anything else...
It got me thinking... Does that say something about human nature? Or about our nature (as a social group)? No answers required!
|
Phoenix Az. Ham fest pickups
I attended the hamfest in Phoenix last Saturday. I was able to pick up a TM506 with a DC503 and a PS501 all working for $40. Also 3 2430A along with 2 TDS320 and a TDS420 for $100. One of the 2430A are a 10,000 serial number (sad face) and the other two are 30,000+ . The TDS420 has leaking SMD capacitors which I'm going to attempt to change and possibly a power supply issue. One of the TDS320s fails acq self test on channel one, but the other works perfectly. After some cleaning and swapping some broken pots on the 2430A I am left with two working 2430A a working TDS320, a working TM506 and 50/50 chance of a working TDS420. The 2430A all appear to come from the Marine Corps due to the Marine Corps calibration stickers and the TDS320 have Naval Air stickers on them. I really like how the front panel just pops off on the 2430A I was dreading changing the pots with broken shafts but the way the front comes off is pretty slick and made the job painless. The SMD caps for the TDS420 should be here Thursday so I will know more then. Hope everyone is doing well and thanks for letting me share.
Brendan
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Selection criteria of TD3A in trigger circuit
In the manuals for some 500 series Tek scopes, the TD3A tunnel diode (4.7 mA, used in the astable rather than the pulse generation section) has 'selected' next to it. Does anyone know by what criteria the diode was selected?
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Re: OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
eBay has several vendors selling small modular SMT / SMD Surface Mount Parts containers.
You can get them quite cheaply if you look for the bulk sales.
Just do an eBay (or better still Picclick - much better search engine for eBay) search for SMT or SMT Component Boxes.
They are a nice modular system of clip together boxes, originally designed for SMD / SMT component storage, which have transparent hinged lids that flip up 90 degrees & firmly latch closed.
Some boxes have a small metal spring to open the lid while others use a less durable system of a plastic spring.
These modular boxes are designed to clip together on all four sides & are made in a variety of sizes based on a multiple of the smallest size with a common 21mm height.
The smallest box is 25mm across the front with the latch & 31.5mm on the side (No. 1).? These boxes are ESD safe (antistatic) for storing static sensitive components.
The boxes are manufactured in a variety of colours by several different companies but some sizes are commonly available in only one or two colours on eBay.
Some similar looking clip together boxes do not fit these.? The incompatible boxes often have a module with many smaller boxes in a single unit.
Dimension L, Length, is the front side with the latch.
*No.1? 25 x 31.5 x 21.5 mm? L x W x H *
Black / Blue / Brown / Green / Pink / White / Yellow
ID: 21 x 18 x 18 mm??? This is the smallest module size.
*No.2? 75 x 31.5 x 21.5 mm? L x W x H? Green*
Normally only green but also rarely in blue & pink.
3 modules long (front) x 1 module back.
*No.3? 75 x 63 x 21.5 mm? L x W x H??? Pink *
Normally only pink but also rarely in blue & green.
3 modules long (front) x 2 modules back.
*No.4? 125 x 63 x 21.5 mm? L x W x H??? Yellow *
Normally yellow but also rarely in blue, green, & pink.
5 modules long (front) x 2 modules back.
The great thing about these is that you can clip them together in a nice sized stack for ease of handling.
You can colour code for contents but the "alternate" colours may be more expensive.
I haven't got around to it yet but I have a cheap tool box with drawers in the front that I am going to gut & use slides of plywood in aluminium channel to make the boxes into layer drawers.
Because they are so low & small, a lot of compartments can fit into a small area.
You do find a certain number of faulty boxes.
Sometimes the hinge sort of falls apart when the box opens - you may be able to tension the spring to stop that or keep those boxes in a row other than the back one.
Often they do not fall apart if there is another row behind them.
Sometimes a box will not open fully.? Exercising it will often get it to come right.
If you do end up with too many faulty ones from an eBay seller then they normally have to either send you more or do a discount.
There are some other similar containers that are not interchangeable, often in blocks of containers, so you need to check the dimensions.
Regards,
Brian.
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On 04-Dec.-18 08:56, Harvey White wrote: On Mon, 3 Dec 2018 17:04:15 -0500, you wrote:
If you have more than a couple of each, get small pill bottles with
snap on caps, write the device number on top and keep them in order.
Make small trays slightly higher than the bottle and you can stack
them in a drawer. You could probably stuff a couple hundred in a
drawer.
Not my idea, I saw a collection of smd parts organized that way
(using smaller vials) and it was pretty impressive. I use bead organization containers for SMD parts. Locally, Michaels
or Hobby lobby may have them. You get about 20 screw top plastic
vials in a plastic case for not too much (look for sales). These are
about 1 inch in diameter.
I put a 3/4 inch colored dot label to discriminate between 1% and 5%
resistors, for instance.
Some containers are available in a 1 3/4 (or so) diameter. Those can
be used for tape mounted SMD parts.
Be aware that these containers are not necessarily anti-static.
Things that need static protection may be left in the tape which can
be cut or curled to fit the container.
Other containers for beads, especially with locking tops, are good for
screws and nuts.
Harvey
Paul
|
Re: OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
Hello all,
Thank you everybody for all your valuable input.
I can't possibly summarize everything in an answer, or quote or give appropriate credit to each method, but - in general...
I started with this idea to categorize the transistors in a way that their physical placement would somehow reflect their key characteristics... all that in order to save space and minimize the number of separate "compartments"...
But in the light of all your answers - the idea of the plastic bags or coin envelopes catch my attention the most - I got convinced that it's not all that difficult to really have the transistors separate by individual part numbers.
The bags (or coin envelopes) don't take much space, are cheap, and allow to keep the parts organized, without the need of having that many number of compartments (the envelopes become the compartments).
The discussion about being anti-static or not, well, I`m in Sao Paulo (Brazil) and humidity is usually not lower than 50% so, static is rarely an issue here.
Still, I`ll look for anti-static bags and, if they're affordable, it will be my preferred choice.
Thank you again and Rgrds,
Fabio
P.S. It seems the more OT the subject is, the more it grabs the group's attention and triggers more collaboration than anything else...
It got me thinking... Does that say something about human nature? Or about our nature (as a social group)? No answers required!
|
Re: TDS3032 does not boot. LCD backl-ight and fan working.
Thanks David.
Unfortunately, holding the B-trig during power up makes no difference.
Benjamin
|
Re: OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
My original database was custom software on a Commodore 64. Due to limited memory, I had to have multiple databases, one for each class of components.
Large quantities are in anti-static bags, in small corrugated paper boxes that fit nicely into lager boxes on the shelves. Tape and reel are sorted and stored in open topped boxes with dividers to find each reel or reels of components. I have over 500 reels of SMD components, and the latest addition is a reel of 1000 78L05 in a SOT-89 package.
Michael A. Terrell
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-----Original Message----- From: Jose Luu <jose.luu@...>
Sent: Dec 4, 2018 3:15 AM
To: [email protected]
Subject: Re: [TekScopes] OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
I use small bags in bins.
Inside the bag, a paper label tells the type.
If too numerous: no bag, single part number in the whole bin. (Or 2 part
numbers with very different packages)
Most important: I use partsbox.io to keep track of the bins contents
On Dec 4, 2018 9:02 AM, "Michael A. Terrell" <mike.terrell@...>
wrote:
I use small coin envelopes for bipolar transistors. Then, if they cross to
the ECG/NTE system, the envelope goes into a drawer in the 20+ 50 drawer
cabinets in the shop. I started doing this in 1970, and it has worked well.
Anything that doesn't fit that system ends up sorted in part number order
in tray bins.
|
Re: OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
I use small bags in bins.
Inside the bag, a paper label tells the type.
If too numerous: no bag, single part number in the whole bin. (Or 2 part
numbers with very different packages)
Most important: I use partsbox.io to keep track of the bins contents
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Show quoted text
On Dec 4, 2018 9:02 AM, "Michael A. Terrell" <mike.terrell@...> wrote: I use small coin envelopes for bipolar transistors. Then, if they cross to the ECG/NTE system, the envelope goes into a drawer in the 20+ 50 drawer cabinets in the shop. I started doing this in 1970, and it has worked well. Anything that doesn't fit that system ends up sorted in part number order in tray bins. Michael A. Terrell -----Original Message----- From: ¸é±ð²Ô¨¦±ð <k6fsb.1@...>
Sent: Dec 4, 2018 1:24 AM
To: [email protected]
Subject: Re: [TekScopes] OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
Jim-your memory is fine. most likely meant both "boring" types in
similar package styles.....
¸é±ð²Ô¨¦±ð
On 2018-12-03 10:18 p.m., Jim Ford wrote:
Say, isn't the 2N3906 a PNP transistor? And 2N3904 is the NPN
complement? Or does my memory from 30 some odd years ago fail me? Thanks.
Jim F.
|
Re: OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
I use small coin envelopes for bipolar transistors. Then, if they cross to the ECG/NTE system, the envelope goes into a drawer in the 20+ 50 drawer cabinets in the shop. I started doing this in 1970, and it has worked well.
Anything that doesn't fit that system ends up sorted in part number order in tray bins.
Michael A. Terrell
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Show quoted text
-----Original Message----- From: ¸é±ð²Ô¨¦±ð <k6fsb.1@...>
Sent: Dec 4, 2018 1:24 AM
To: [email protected]
Subject: Re: [TekScopes] OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
Jim-your memory is fine. most likely meant both "boring" types in
similar package styles.....
¸é±ð²Ô¨¦±ð
On 2018-12-03 10:18 p.m., Jim Ford wrote:
Say, isn't the 2N3906 a PNP transistor?? And 2N3904 is the NPN complement?? Or does my memory from 30 some odd years ago fail me?
Thanks.
Jim F.
|
Re: OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number)
Thanks, Renee'. The old memory is not what it used to be. Not totally
gone yet, though, evidently.
Jim
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------ Original Message ------ From: "¸é±ð²Ô¨¦±ð" <k6fsb.1@...> To: [email protected]Sent: 12/3/2018 10:24:31 PM Subject: Re: [TekScopes] OT - Method of choice to sort and store assorted transistors (apart from having one bin for every part number) Jim-your memory is fine. most likely meant both "boring" types in
similar package styles.....
¸é±ð²Ô¨¦±ð
On 2018-12-03 10:18 p.m., Jim Ford wrote:
Say, isn't the 2N3906 a PNP transistor? And 2N3904 is the NPN
complement? Or does my memory from 30 some odd years ago fail me?
Thanks.
Jim F.
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: "Vladimir _ via Groups.Io"
<vladimirshs@...> Date: 12/3/18 8:14 PM (GMT-08:00)
To: [email protected] Subject: Re: [TekScopes] OT - Method of choice
to sort and store assorted transistors (apart from having one bin for
every part number)
I thought about four drawers, each with maybe a dozen or sixteen bins
(4 x 3 or 4 x 4).
The four drawers would be Small and Medium PNP (or P-channel) - Small
and Medium NPN (or N-channel), Large PNP - Large NPN. I use the same system, except instead of drawers I use plastic
compartment boxes lined with aluminum foil. I also happen to have
several hundreds of "boring" small NPNs (basically 2N3906s and
similar), so that's a separate fifth group.
I keep track of individual transistors on my computer. For each group,
I have a folder with datasheets for each part number, with available
quantity and important specs (Vceo, Ic, fT, etc) in the filename.
There is also a backup copy of the entire thing on a flash drive.
This system makes it very easy to tell what's in stock and identify
substitutes. Once I decide on a specific part, all I need to do is to
look through that compartment, and I already know what the part looks
like because of the datasheet. It takes some care to set up and
maintain, but the space savings and ease of use are incredible.
--- This email has been checked for viruses by AVG.
|
John Sykes
Fabio Trevisan
Michael A. Terrell
Jose Luu