Date   
Re: 2215 cleaning + recap

guy232
 

Did ya get the screw hiding under the chasis rail circled here?

https://imgur.com/a/O81VEZN

Re: 2465B Option 05 + 06 (TV/CTT)

Chuck Harris
 

You missed the custom ASICs that do all the counter timer
work.

It would be far cheaper to buy another 2465B that has the
options you want.

-Chuck Harris

@app41 wrote:

Hello all,

I own a Tek 2465B and I like it a lot :)
I started digging the web to find options boards but after having bought a TV option 05 I discovered it was the same board as the CTT, but only with components for the TV option.
Since I can't find a TV/CTT board on the web, I wonder if it would be possible to populate the board with missing components, to recreate the CTT option ?
Seems to be standards parts ; I would need only dump of EEPROM of someone owning these options. Did I miss something ?

What do you think about that ? If you have a TV+CTT option to sell, please tell me :)

Guillaume



2465B Option 05 + 06 (TV/CTT)

@app41
 

Hello all,

I own a Tek 2465B and I like it a lot :)
I started digging the web to find options boards but after having bought a TV option 05 I discovered it was the same board as the CTT, but only with components for the TV option.
Since I can't find a TV/CTT board on the web, I wonder if it would be possible to populate the board with missing components, to recreate the CTT option ?
Seems to be standards parts ; I would need only dump of EEPROM of someone owning these options. Did I miss something ?

What do you think about that ? If you have a TV+CTT option to sell, please tell me :)

Guillaume

Re: 7633 is disassembled -- want any parts, CRT? not known to work at all

Randy Newman
 

Do you happen to have the horizontal board? My 7633 has flaky horizontal ( short trace) which I fixed, but recently went to No trace.

Re: New member and my story

Randy Newman
 

Hi Tim:
Rickreall hamfest....wow.....I lived not far from there growing up. Now live further north in Washington state. I happen to have 4 Tek scopes: 7834, 7633, 7623, and a fine 555 ( with 2 CAs, D, W, and 1A7). Plus various other items from Fluke, HP, Keithley, Systron Donner, Analogic, etc.
Are you still involved in this forum?
Best wishes in Tek land.

firmware 2465B

bittau@...
 

Hi Group, I am looking for the 160-5370-11 and 160-5371-11 the firmware for 2465B (below B05xxxx), does anyone has this image binary file? Thanks in advance Claudio

2215 cleaning + recap

ridderg@...
 

Hi all, I’ve recently bought a used, somewhat beat up but functional 2215. The trace sometimes shifts vertically, probably due to dirty switches. The plan is to clean some of the switches and replace all PSU caps.

I’ve started disassembly but am currently blocked as the HV shield seems stuck. I’ve removed all screws as indicated in the service manual (which in itself was a pain as a couple of screws were worn out). The shield can be wiggled but seems stuck at the right side somewhere (looking from the front).

Did I miss anything or should I just apply more force? Any tips would be appreciated. Thanks!

Re: TM500/TM5000 extender project

Arie de Muijnck
 

Add a pin 1 marker (small triangle)  to J4...J10. It might same someone a lot of trouble.

If +8_11.5VDC is max 11.5VDC then the voltage on TTL_HIGH can be max 7V, way too high for TTL.
Better use a 5.6V zener instead of R2.

Regards,
Arie

On 2020-02-12 23:20, Ke-Fong Lin wrote:


Hi everyone,

The PCB is ready! I've updated the preview and the
schematics.

https://drive.google.com/file/d/14WSoPeQoIwup4532_YnxUz44PVxAYJ8T/view
https://drive.google.com/file/d/1E7RxXXPg_3-Kwd652mFbe5g-4zoBeAN_/view

In
particular, I've added a small circuitry to generate the "power good
signal" for the TM5000 modules.
It's basically a voltage divider from 8V
to 5V, and an NPN buffer. The PWR specifies a full load (16mA) of TTL high
(+5V).
A small drawback is that it always draws around 2-3mA even if not
to needed (inserted in a mainframe).

Can some of you do a review of the
schematic? Or give some comments or suggestions?
For those really curious,
I can send the complete kicad project, just ask. Final version will be an
github of course.
For a pure extender use, there is just some wiring to be
done. Otherwise, I'll have to provide some sort of BOM.
I also have to
write a small "documentation".

Plan is to send the PCB to fabrication
(JLPCB) this week-end, after feedbacks.

Best regards,

Re: 11301/11302 in the Bay area

Jerry
 

I bought a stationwagon-load of Tektronix and HP specific caps, mostly, but a lot of transistors and preformed resistors from a guy last year or so. He was servicing scopes, I guess. In the box was a curve tracer that's available still on ebay and for the heck of it, I tried it out and it did a fairly decent job on small transistors. You can find it on ebay by searching for "curve tracer" and looking for a bag of parts that cost around $25. I also have a Mini-CT I built that was in QST a while back but this simple current step circuit works pretty well. YAou need an analog scope to use it effectively. The trace is best at 500us per division. The persistence on my 3054B does a decent tds784 and DSA602, 2440, and others won't show a trace. I used my Mini Ct recently to match transistors for a mixer but i could have used this other circuit.

Jerry

Re: 11301/11302 in the Bay area

John Griessen
 

On 2/12/20 2:09 PM, Jerry wrote:
The other thing I wanted an analog scope for was doing semiconductor curves. I have a couple of circuits (not the octopus type) that do a pretty good job of displaying curves.
So, what speed are you tracing I-V curves, and how different from octopus circuits of old?

Re: TM500/TM5000 extender project

John Griessen
 

On Feb 12, 2020, at 17:20, Ke-Fong Lin wrote:
For a pure extender use, there is just some wiring to be done. Otherwise, I'll have to provide some sort of BOM.
Please tell us more about how laborious that wiring is in various ways you have made it possible.
How do you see using the 7 through hole connectors? Are there 7 mating connectors you plan to supply
to users who might have difficulty getting just one of them?

Barrie Gilbert: The most prolific Analog IC designer ever

 

https://www.microwavejournal.com/articles/33425-living-and-learning-with-bar
rie-gilbert



More insights from my friend Barrie.



Dennis Tillman W7pF

Re: TM500/TM5000 extender project

Dave Daniel
 

I noticed that you don’t have anything to strain-relieve the wires. I’d add some holes through which cable ties could be run to capture the wires.

DaveD

On Feb 12, 2020, at 17:20, Ke-Fong Lin <anotherlin@...> wrote:

Hi everyone,

The PCB is ready! I've updated the preview and the schematics.

https://drive.google.com/file/d/14WSoPeQoIwup4532_YnxUz44PVxAYJ8T/view
https://drive.google.com/file/d/1E7RxXXPg_3-Kwd652mFbe5g-4zoBeAN_/view

In particular, I've added a small circuitry to generate the "power good signal" for the TM5000 modules.
It's basically a voltage divider from 8V to 5V, and an NPN buffer. The PWR specifies a full load (16mA) of TTL high (+5V).
A small drawback is that it always draws around 2-3mA even if not to needed (inserted in a mainframe).

Can some of you do a review of the schematic? Or give some comments or suggestions?
For those really curious, I can send the complete kicad project, just ask. Final version will be an github of course.
For a pure extender use, there is just some wiring to be done. Otherwise, I'll have to provide some sort of BOM.
I also have to write a small "documentation".

Plan is to send the PCB to fabrication (JLPCB) this week-end, after feedbacks.

Best regards,


Re: Push-push switch repair (need some theory of operation)

Ke-Fong Lin
 

Only remaining issue with the 7CT1N is that with PNP selected the dot is at
bottom right, not top right. Am I right in thinking this is controlled by
S70D, which is the part nearest the latch?
Yes, most probably.
On the 5CT1N, that part is much simpler: It's either +30 and -30 for each poles, or GND for both.
On the 7CT1N, one of the pole is connected to a voltage divider, which is itself connected to S230.
You may want to check the vert/horiz switch (S230).
My 5CT1N issues were only mechanical, with the 2 switches I've replaced the problems were gone.

Re: TM500/TM5000 extender project

Abc Xyz
 

Nice Board!

On Wed, Feb 12, 2020, 2:20 PM Ke-Fong Lin <anotherlin@...> wrote:

Hi everyone,

The PCB is ready! I've updated the preview and the schematics.

https://drive.google.com/file/d/14WSoPeQoIwup4532_YnxUz44PVxAYJ8T/view
https://drive.google.com/file/d/1E7RxXXPg_3-Kwd652mFbe5g-4zoBeAN_/view

In particular, I've added a small circuitry to generate the "power good
signal" for the TM5000 modules.
It's basically a voltage divider from 8V to 5V, and an NPN buffer. The PWR
specifies a full load (16mA) of TTL high (+5V).
A small drawback is that it always draws around 2-3mA even if not to
needed (inserted in a mainframe).

Can some of you do a review of the schematic? Or give some comments or
suggestions?
For those really curious, I can send the complete kicad project, just ask.
Final version will be an github of course.
For a pure extender use, there is just some wiring to be done. Otherwise,
I'll have to provide some sort of BOM.
I also have to write a small "documentation".

Plan is to send the PCB to fabrication (JLPCB) this week-end, after
feedbacks.

Best regards,



Re: TM500/TM5000 extender project

Ke-Fong Lin
 

Hi everyone,

The PCB is ready! I've updated the preview and the schematics.

https://drive.google.com/file/d/14WSoPeQoIwup4532_YnxUz44PVxAYJ8T/view
https://drive.google.com/file/d/1E7RxXXPg_3-Kwd652mFbe5g-4zoBeAN_/view

In particular, I've added a small circuitry to generate the "power good signal" for the TM5000 modules.
It's basically a voltage divider from 8V to 5V, and an NPN buffer. The PWR specifies a full load (16mA) of TTL high (+5V).
A small drawback is that it always draws around 2-3mA even if not to needed (inserted in a mainframe).

Can some of you do a review of the schematic? Or give some comments or suggestions?
For those really curious, I can send the complete kicad project, just ask. Final version will be an github of course.
For a pure extender use, there is just some wiring to be done. Otherwise, I'll have to provide some sort of BOM.
I also have to write a small "documentation".

Plan is to send the PCB to fabrication (JLPCB) this week-end, after feedbacks.

Best regards,

Re: WTF: TDS3000 Blank option modules.

Magic_Smoke
 

A very good tip. I'll see if I can get my hands on one somewhere, I've found it a little tricky to get things just right based on drawings alone.

Re: 11301/11302 in the Bay area

Jerry
 

The manual looks interesting but no real troubleshooting in it. I did see an adjustment for horizontal dynamic jitter or positioning, I can't find it again. The issue with my scope, other than dropping the constants, is that I can adjust the scope display pots to get a nice text display but there is something stored incorrectly because when I reboot, it is all out of focus again. But even when I get a nice text display, the trace doesn't overlay correctly. so the trace looks wide horizontally. I have the software for calibration and went through some of those but it looked, if I remember from last year or so, that it wasn't saving or holding the settings so it probably needs new flash ram.

I wanted a 400Mhz+ analog scope because all my DSOs do a poor job at displaying modulation no matter how much I screw around with them. The other thing I wanted an analog scope for was doing semiconductor curves. I have a couple of circuits (not the octopus type) that do a pretty good job of displaying curves. My DSOs, with the exception of my TDS3054D just don't work well there. I have all the plug-ins and use them in my DSA602 so I would love to get this one working, but I really think it is toast and I am going to take one more look and then trash it.

Thanks

Jerry

Re: 11301/11302 in the Bay area

Siggi
 

On Wed, Feb 12, 2020 at 10:21 AM Oz-in-DFW <lists@...> wrote:

Where did you find it? I have a sick one needing attention.



Re: 11301/11302 in the Bay area

Oz-in-DFW
 

Where did you find it? I have a sick one needing attention.