Date   

Re: Scope schematic needed...

WB4IUY
 

Well, darn. All of the links on that page have expired :-( Still looking...

Dave


Re: Scope schematic needed...

WB4IUY
 

Thanks, I'll give that a try. I've emailed Ballantine but no answer, yet.

Dave


Re: Need a 376-0144-00

Michael W. Lynch
 

On Thu, Dec 3, 2020 at 07:52 AM, zenith5106 wrote:


On Wed, Dec 2, 2020 at 10:45 PM, Michael W. Lynch wrote:



Do you have a dimensional drawing, 3D model, STL File, etc.?
www.hakanh.com/dl/temp/384-1305-00.pdf


/Håkan
Håkan, Thanks for the PDF, saved me the trouble looking for that information.

Looking at the dimensions in the PDF and other information, so graciously provided, this appears to be a simple straight, stepped shaft with a aluminum insert in the larger end. if this is the case, this could easily be turned on a lathe. No need to 3D print this at all. I would think that nylon rod might be suitable? Nylon is easy to machine and durable.

One piece of information that is missing is dimension "C", which is probably a critical dimension. Strange that in this entire list, this part is the only one that omits Dimension "C"?

If we had dimension "C", the rest of the project would be straightforward. It would take time to build, but completely doable. If someone can provide the original Aluminum insert, then that would make the process less time consuming.

--
Michael Lynch
Dardanelle, AR


Re: Need a 376-0144-00

 

On Wed, Dec 2, 2020 at 10:45 PM, Michael W. Lynch wrote:


Do you have a dimensional drawing, 3D model, STL File, etc.?
www.hakanh.com/dl/temp/384-1305-00.pdf

/Håkan


Re: OT: Analog Computer Comdyna GP-6

Wolfgang Schraml
 

Thank you everyone for the great stories you shared about analog computing. Too bad no additional leads for documentation on these older devices turned up (yet). I will keep searching.

My second 455 scope arrived yesterday. It is in great overall shape. Just needs some DeOxit and fader lube for the switches and potentiometers. Otherwise, it appears to be working fine.

Thank you, Wolfgang KI7PFX


Re: Peter Keller book payments PayPal won't release

Jean-Paul
 

Bonjour à tous

Pity for all the waste of time because of PayPal.

their rules, charges and robots make these types and transactions risky as we see.
Even epay will drop them in a few years. Any overseas use of PayPal incurs an additional 10% fee of very bad exchange rate and added fees.

I Suggest we pay by check via post in the future, at least for USA members.

Bon courage

Jon


Re: Peter Keller book payments PayPal won't release

Tam Hanna
 

Hello Folks,

OK. I have literally never seen more Angst in one place than this - Dorit-Mendel will have spinal surgery next week, and my Ex-Wife is less afraid of death, surgery and a four week stay in Hospital than what is exhibited here.


Either way, let me make an offer: I commit to buying up to 10 pieces of the book, if Tilman is left holding onto them because of PayPal BS. I will pay via wire transfer from OTP Banka of Hungary (our government bank).


Is this a good deal?


Tam


--
With best regards
Tam HANNA

Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/


Re: Need a 376-0144-00

Ed Breya
 

If you can print fiber reinforced plastics, I'd recommend that. Those couplings need to be pretty strong. Also, the dielectric strength rating is for through the insulating material - that's usually the easy part. What matters is what can go around the insulator, so the dimensions and clearances have to be big enough, and the surfaces as smooth as possible. If the surface is rough, it can break down at lower voltage, especially after a long time collecting dirt and moisture. This shouldn't be too critical for only 1600V, well below corona voltage, so many plastic types should be just fine in this respect. I think it's safe to assume the original part design handled it with plenty of margin, voltage-wise, and the mechanical size is mostly for strength.

Ed


Re: SUCCESS! The "sick" 475A is now the "fixed" 475A!

 

Hi Jeff,
Yes I know 'ordinary' carbon comp resistors go high, but most resistors in TEK products (and old Fairchild Dumont scopes) are high quality IRC or Welwyn.
In my TEK 191 sig. gen. the very few ordinary resistors were a bit high, but were in non-critical parts of the circuit.
Now to resume work on two 545B's, which do indeed require a substantial workbench!
Regards.


Re: I give up.

-
 

George, It's already taken care of.


Cheater, FWIW I don't know anyone that carries a balance in their PP
account. Not only does PP not pay interest, but PP has been known to yank
money back out of their customer's accounts without warning so everyone
that I know takes their money out of PP as soon as possible. Yes. I know
that PP can also yank money out of their customer's bank accounts as well.
Most people keep only a minimum amount in their linked accounts for that
reason and keep their main bank account in a different bank entirely.

On Wed, Dec 2, 2020 at 9:11 AM George Onufer <amatec@att.net> wrote:

Mr. RigdonI am so sorry to hear of the tribulations you have endured in
trying to buy these books.Dennis took on this task (beyond the
resposibility he already had as moderator) out of his respect and sense of
duty to the group. He established ground rules to make it manageable for
himself. If, for whatever reason, these don't work for you, then by all
means he should make a special exception in your case.GeorgeSent from my
T-Mobile 4G LTE Device





Re: Need a 376-0144-00

Michael W. Lynch
 

Eric,

BTW, the Dielectric Strength of my preferred printing material (PETG, See Below) is 45kV/mm so I can print the parts if you can give me some accurate dimensions to work from.
Materials Dielectric Strength (kV/mm) Min Max
PET - Polyethylene Terephthalate 60.00 60.00
PET, 30% Glass Fiber-reinforced 16.80 22.50
PETG - Polyethylene Terephthalate Glycol 45.00 45.00

I'll print it free of charge just cover the cost of shipping.

Should cost next to nothing to ship as it will weigh almost nothing.

Let me know.

--
Michael Lynch
Dardanelle, AR


Re: Need a 376-0144-00

Michael W. Lynch
 

/Håkan,

I knew that there was some discrepancy somewhere. I was not seeing anything that looked like a coupler or that part number in my manual. #72 the 384-1305-00 shaft assy. was as close as I could get. I do not have a copy of the older version of the service manual. Thanks for shedding light on this.

--
Michael Lynch
Dardanelle, AR


Re: Peter Keller book payments PayPal won't release

stevenhorii
 

I have used PayPal for purchasing something from an eBay seller using his
PayPal account (automatic, but when I see the statement from PayPal, it is
his e-mail that gets used). As for any purchase from eBay, PayPal deducted
the fee from the payment. More than once, I purchased something from the
same person using the same e-mail address, but it was a direct purchase and
not through eBay. It was also not an item listed on eBay; he sent me an
e-mail saying he had it and asked if I wanted it. I did, so I purchased it
and paid using PayPal F&F. They sent the full amount. I actually did this
again a couple of months later and again, it went using F&F with no fee
deducted. So, I purchased from the same person using the same PayPal
account on both my end and his both times. I think they would certainly not
have let it go through as an F&F if it had been for an eBay sale. I also
have reimbursed my brother when he had some expenses from taking care of
our mother - but that really is an F&F transaction and his e-mail address
has his name in it. No problems there, either. But the recent experience
with replacing F&F or adding an extra step to it with "I do not accept/need
insurance for this transaction" and the "do you trust this recipient?" is
new (at least to me).

Steve H.

On Wed, Dec 2, 2020 at 3:10 PM Vince Vielhaber <vev@michvhf.com> wrote:

It's not Dennis' fault. Plenty of people have paid with F&F with no
issues. PayPal will stop your ability to pay F&F if 1) you've abused it
and/or 2) you've had bounced transactions (bought something and the bank
said NSF or had some other reason to decline it.

If you accept F&F and then use PP to send something to that person, PP
will change it from F&F to product purchased and take the fee.

Vince - K8ZW.

On 12/02/2020 03:03 PM, Eric wrote:
If there is an underlying issue with Dennis's pay pal reputation as this
seems to be an ongoing issue and it is just a few button clicks to make
badly written software happy If there is enough transactions to build the
reputation this would no longer be in issue in the future. I would be more
then happy to buy a string of $0.50 or $1.00 random Tek vaper ware from
Dennis and just say I received the parts I am guessing about 50 ish
transactions should make the pay pal software happy that Dennis is not a
scammer and we would be able to proceed as normal.

Thoughts on this?

Eric
-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Chuck
Harris
Sent: Wednesday, December 2, 2020 1:18 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Peter Keller book payments PayPal won't release

I have written you personally, but I may as well tell the group why
there is a problem publicly.

Paypal accounts that are using a credit card to make payments cannot do
friends and family, without incurring a cash advance charge from their CC
company, and starting the interest rolling on the balance on their card....
even if they pay the full bill every month.

So, to sent cash using paypal, we have to use the purchase goods and
services method. That allows for an ordinary charge on our credit cards.

To make this work, though, he has to lie to paypal and say that he has
shipped the book. Then we can lie to paypal and say that we have received
the book.

IT MUST BE DONE IN THIS ORDER!

If Dennis doesn't tell paypal he has shipped the book, he will have to
wait 30 days before paypal will release the funds.

If Dennis does tell paypal he has shipped the book, then we can click on
the Received button, and his funds will be released immediately. (Well,
unless he has other problems with paypal, like a history of not sending
stuff, or a lot of returns...)

-Chuck Harris

Dennis Tillman W7pF wrote:
The following people have sent payment for Peter Keller's book but
PayPal is holding the funds and will not release them to me so I can
pay Peter Keller for your book(s).
BL, $35.63, ON HOLD Nov 22
SJ, $68.53, ON HOLD Nov 22
BG, $38.54, ON HOLD Nov 23
CH, $73.93, ON HOLD Nov 23
DG, $68.53, ON HOLD Nov 23
DG, $6.20, ON HOLD Nov 24
LS, $35.63, ON HOLD Nov 26

PayPal describes these transactions as "Pending". It explains that
"This payment is in your on hold balance. Update your shipping info or
order status to get your money sooner."

If each of you will give me permission to tell PayPal one of the
following:
1) I shipped, or I am planning to ship, Peter Keller's book to you;
2) Your payment was for a service or virtual product which doesn't
need to ship.

Then I think PayPal will release your payment.

Dennis Tillman W7pF














--
K8ZW http://www.metalworkingfun.com http://www.hamradio.fun






Re: 2710 mpu lockup on start. Help!!

 

On Wed, Dec 2, 2020 at 11:53 PM, Stephen Bell wrote:


A failing EPROM can be very sensitive to the supply voltage being a bit low.

You can check this with one of the better EPROM programmers that has voltage
marginning to verify the data. Read in the data at nominal 5V Vcc and
re-verify the data at Vcc +/- 10%
Many (early) devices have a Vcc spec of 5V +/- 5% (like standard TTL, Intel 2732 etc.), so 4.78V is marginal in any case. Also, It's low for a +5V nominal power supply.
I'd really check that.

Raymond


Re: 2710 mpu lockup on start. Help!!

Stephen Bell
 

A failing EPROM can be very sensitive to the supply voltage being a bit low.

You can check this with one of the better EPROM programmers that has voltage marginning to verify the data. Read in the data at nominal 5V Vcc and re-verify the data at Vcc +/- 10%


Re: Are all 177 test fixtures created equal

DW
 

Thanks!


Re: Need a 376-0144-00

 

On Wed, Dec 2, 2020 at 11:21 PM, Eric wrote:


In the mechanical of the 177 service manual I have it is part # 70
In an older manual it is as you say #70 however this part and #71 were both replaced with
384-1305-00 which is the coupler and shaft in one piece. In a newer manual only the newer
part is shown and then as #72.

/Håkan


Re: Need a 376-0144-00

Eric
 

In the mechanical of the 177 service manual I have it is part # 70 it is under the extension shaft it sits between the switch and the shaft that goes to the current per div knob. Apparently collector voltage is on this switch so that is why the need for the insulated coupler.

Eric

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Michael W. Lynch via groups.io
Sent: Wednesday, December 2, 2020 4:46 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Need a 376-0144-00

On Wed, Dec 2, 2020 at 02:28 PM, Eric wrote:


Does anyone have or know how to duplication a 376-0144-00 This is a
mechanical shaft coupler used in the 177 fixture. It needs to be
insulated up to 1600 Vdc from the collector supply. This is one of the
last pieces I need to get a 577 up and running again. I currently do
not have a 3d printer so this is not an option for me at the moment.
Eric,

I went to my 177 (JAN/1983) Fixture Mechanical parts manual and I do not see a part listed by that number. Is that extension a part of the switch? Are you sure about that Part #? I see "384-1305-00 EXTENSION SHAFT: 0.494" x 1.2" LONG. W/SHLDR". Perhaps I am overlooking this in the list?

Do you have a dimensional drawing, 3D model, STL File, etc.? One would need to make sure that the 3D printing materials used had the Dielectric strength to insulate 1600V. I can print it if we can determine that the materials that I use have the proper insulation properties.

.
Michael Lynch
Dardanelle, AR


Re: Are all 177 test fixtures created equal

Eric
 

As far as I am aware yes they are however there are some build differences and the knob is different as well as the lighting. Early examples have 2 lights later ones have a single light and a printed ring.

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of DW
Sent: Wednesday, December 2, 2020 5:16 PM
To: TekScopes@groups.io
Subject: [TekScopes] Are all 177 test fixtures created equal

A simple question, can any 177 test fixture fit into any 577 curve tracer regardless of its build date / serial number? Thanks


Are all 177 test fixtures created equal

DW
 

A simple question, can any 177 test fixture fit into any 577 curve tracer regardless of its build date / serial number? Thanks

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