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Hi Albert. Sorry for that. :-(

I had a great time fixing up two 454s in the late Summer. One I had owned for some time but had been left unused for a few years, needed a replacement for one of the 0.015uF 2.5kV capacitors in the high voltage box. Not an easy job to dismantle the box with many silver bearing solder connections but once done the scope is almost like new.

The other one was bought very cheaply for spares and had numerous faults but all easy to fix. A shorted capacitor in the high voltage driver section, a few plug in transistors and one power transistor to change. The only difficult job was replacing the trigger tunnel diodes but that is done now and this scope is also working like new. I have given them an approximate calibration against a cheap DDS signal generator and they are easily brought back to spec.

So my story is that I love the 454s, they may well fail with age but parts are easily obtained (apart from the aforementioned tunnel diodes) and they are a delight to use. There is a wealth of expertise to help you with any problems, the biggest difficulty is that if you have a dead scope, almost the first thing you need to fix it is a working scope!

Have fun with your 454,

Roger

On Fri, Dec 12, 2014 at 9:13 AM, <walter2@...> wrote:

I know what signal skew is, but I am baffled why there are so many Tek de-skew fixtures, and what their real purpose is, or even what equipment they are used on. can anybody enlighten me?

Here's the instruction sheet for the 067-0405-02:

I know what signal skew is, but I am baffled why there are so many Tek de-skew fixtures, and what their real purpose is, or even what equipment they are used on. can anybody enlighten me?

foolishly it would seem to me that I could just connect multiple channels to the same source to see if they are skewed, what clever bit am I missing?

many thanks,
walter
Sphere Research Corp.

My recently purchased Tektronix 454 came with some Probemaster 3901-2
probes (switchable 1x, 10x), but the manual recommends P6047 to get maximum
bandwidth support for this scope.

I saw (and bought) a couple P6047 probes on eBay (havent found another
source for them), but I am curious probe compatibility between
manufacturers and if other probes (with equivalent bandwidth ratings are ok
to use as well).

Thanks in advance,
Brian

Thanks for the recommendations on the EHT capacitor and the Nuvistors.
Brian

I live in the St Louis, Missouri area, would be interested if there are
others in this area from the group as well.

Here is a picture of the scope


Brian

You forgot the video link?
Albert


---In TekScopes@..., <sadosp@...> wrote :

Arrived from a friend before 1 week. Problem shown on the video.

Arrived from a friend before 1 week. Problem shown on the video.
I changed up to now the following components with another 2445, as to check what work and what not. All the above work good.


1. PSU
2. Controller board.
3. Readout board.
4. Front controls board.
5. All the hybrid ic's.
6. Display Sequencer.


The PSU output voltages is at specified range. Intensity control not setting down full the beam.
Have someone an idea where to start looking? I mean with the measurements..

On Thu, Dec 11, 2014 at 2:36 PM, <ditter2@... mailto:ditter2@...> wrote:

>Also, consider the fact that Wankel engines are always less efficient than equivalent piston engines...
Huh? Since when are Wankel and piston engines equivalent?

Anywhichways, I concur: someone must be augmenting his/her income by submitting questionable designs to ED and getting them published...
I also concur that this is getting way off topic (especially on a Tekscopes forum: we have far more complex ways to measure crystal frequency)...

Brian:

yes, keep it and enjoy.

There's a 500pf 16kV door-knob capacitor in the EHT which sometimes fails, but it's not nessecarily going to go pop in your 'scope.

Other than that, the Nuvistors, being thermionic valves, do wear out, so you could inverst in a couple of spare 8393's when you spot some at a sensible price.

John

For me personally the answer is simple: for the equipment I own there is no manual in your list that I don't have already. The other way around I own many manuals double or of equipment I don't have and don't want to have; sometimes offered a few cheap for sale but no response at all.

Albert


---In TekScopes@..., <dcasey@...> wrote :

I was surprised to learn from Paul Washa that so far, I am the only
person who has bought manuals from him.

Where do you live, maybe one of our members is close and can come and give
it a once over (for a beverage of choice or similar)?

Regards,
David Partridge

I was surprised to learn from Paul Washa that so far, I am the only
person who has bought manuals from him.
When Dave at Artek had to move his 3 tons of mostly HP manuals, there
were these two boxes of Tek manuals that went to Paul so he could help
find them a home instead of letting them go to the dumpster.
I'm very pleased with the four I bought, and I thought the pricing was
very reasonable (cheaper than you could print and bind them, even if the
PDF were free).
I'm amazed that as much as everyone raves about how they like to have
hardcopies, no one else has bothered to pick any of these up. I know
there's one or two in there you can't give away, but I think there are
still many available that people would be happy to get.

Paul has given me his consent to advertise his inventory to the list for
him. Of the four I bought, three were originals and one was a very well
done, comb-bound photocopy. If you'd like any of these, talk to Paul
about pricing (his address is in the original post below) and
availability; I don't have them (n.b. there's also a handful of Wavetek
manuals at the bottom of the list):

2245A Service (070-6557-00)
453A Option 5 Instruction (070-1714-00)
222 Service (070-7459-00)
2232 User (070-7066-02)
D11/D15 Display Unit (070-1133-01)
7B70 SNB205000+ (070-1579-00)
DAS 91S16, 91S32, P6464 Operators (070-5396-00/062-5847-08)
2445A/2455A/2465A Operators (070-6014-00)
2710 Service (070-6024-01)
7313/R7313 Interim Instruction (no number)
1121 Amplifier (no number)
11A71 Extended Service (070-7392-99)
613 (070-1407-01)
7M11 (070-0987-00)
11301/11302 Incoming Inspection Procedure (070-6693-00)
D10 Display Unit (070-1132-00)
Type S Plug In (070-223)
067-0521-00 Calibration Fixture (070-0407-01)
P6075A (070-1597-00)
P6065A (070-1596-00)
P6120 (070-3392-010)
11401/11402 Introduction (070-6103-00)
Type Q Plug In (no number)
1240 Logic Analyzer Reference Guide (870-4641-00)
190A (no number)
Type K Plug In (070-230)
5A15N (070-1136-00)
5-inch Oscilloscope Camera System (070-0383-01)
1A2 (070-430-01)
1A1 (070-0378-01)
7A16A (070-1378-00)
7A15 (070-1044-00)
Type 82 Plug In (070-0349-01)
021-0065-00 Data Communications Interface Unit (070-1458-00)
190A/190E (070-257)
475A and DM44 Instruction (070-2163-00)
466/464 and DM44 Instruction (070-2037-00)
466/464 with Options Instruction (070-1652-00)
496/496P Operators Handbook (070-3483-00)
1106 Power Supply/465/475 Option 07 (070-1514-00)
Type 163 Pulse Gen (no number)
7B92 Operators (070-1401-00)
7B70 (070-0982-00)
141A/R141A (070-1008-00)
1101 (070-0949-60)
7L18 Interim Service (061-1469-02)
760A/760D/760N (070-5992-02)
184 Instruction/Service (no number)

Wavetek manuals:
Model 130 Function Generator
Model 181 XCG/Sweep Generator
Model 162 30MHz Function Generator
Model 98 1 MHz Frequency Generator Op and Maintenance
Model 164 30MHz Sweep Generator

Ya'll help Paul get a couple bucks for saving these and clear out some
space in his garage!

Regards,

Dave Casey


On 11/25/2014 12:55 PM, Paul Washa paulwasha@... [TekScopes] wrote:

I have two bankers boxes of original Tek manuals, if your looking for
a manual, let me know the Manual description and number. I will check
my list and get back to you, Paul Washa Delano, MN w0tok@...

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Dan,

I do not know what it is but I bought it. I think it is worth having.

Jerry Massengale

Just bought a working (I can see both traces, on-board calibration seems ok
on both channels) Tektronix 454 with a Scope-Mobile Type 200C cart.

I havent attempted the adjustments in the manual, and didnt even look a the
calibration section as I dont have the equipment and not even sure cost or
who can even calibrate this old of a scope.

I mostly was wanting a cheap scope to help repair some 70's, 80's arcade
circuit boards that I have (ie. sound circuits, vector boards (oscope in
x-y mode, etc).

I love how this scope looks, but not sure how long I would be able to use
it due to its age.

Any known components that fail on these often, or should I just plan on
using it while I can and hope for the best? I'd like to keep this running
as long as possible.

Sincerely,
Brian

Ebay 281520188515
Looks like a P613x probe, is this a mechanical sample (no guts, not working), or what?

Back at my long-time sick 2246

I've replaced 2209, 2210 and 2214.
Right now my symptoms are that I have no voltages at the large
feed-through connector. I have about 170 volts at the test
points marked "DC+" and "DC-" near diodes, I assume on the incoming
side of the supply.

The heat sink on Q2201 is warm (is that good?). The fan is not turning.

I am not getting any relay sounds, no sounds at all.

Any suggestions on what I should test?


Chris

On Thu, Dec 11, 2014 at 2:36 PM, <ditter2@...> wrote:

Yea, a good example that comes to mind is the piston gasoline engine in several hundred million cars. Most bright kids in junior high school who study momentum would question the stupidity of having all that mass in all the pistons reversing several dozen times a second. And this is suppose to be efficient?

Assuming this is serious: The momentum of the pistons is not relevant
in computing the efficiency of an engine. The question is whether the
kinetic energy of the pistons is somehow wasted when they reverse
direction... and it is not.

Also, consider the fact that Wankel engines are always less efficient
than equivalent piston engines...

---In TekScopes@..., <edbreya@...> wrote :


<snip>

Sometimes, once an evolutionary path is chosen, it can only continue one way, even if it makes no sense compared to alternatives. The alternatives are not all necessarily apparent or available at the beginning, and the path taken can depend on a lot of things.


<snip>
Ed

Yea, a good example that comes to mind is the piston gasoline engine in several hundred million cars. Most bright kids in junior high school who study momentum would question the stupidity of having all that mass in all the pistons reversing several dozen times a second. And this is suppose to be efficient?

- Steve