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Hi Phil,


Yep, that's me. And I did get your email and have sent a response.


What I do is entirely non-destructive. I just need to take measurements from the existing foot

Jeff
________________________________
From: [email protected] <[email protected]> on behalf of Phillip Potter <p.potter@...>
Sent: Thursday, March 1, 2018 1:56 PM
To: [email protected]
Subject: Re: [TekScopes] Back feet for 335 scope

Hi Jeff,

Are you N0dy? If so, I just emailed you about your 400 series feet.

If your process is nondestructive, maybe we can get Lee H. (on list) to
volunteer his one surviving complete foot for measurement...

I have a picture of the foot, upon which I have drawn (crudely) the
measurements, that I will put that in my folder on the server:



If it comes to pass that Lee would allow you to measure and print out
feet... he should probably be the one to receive your kind offer of
printed feet, not me, but I would buy a set from you.

Phil



On 3/1/2018 1:36 PM, Jeff Davis wrote:

Hi all,


I'd be willing to undertake the 3D modelling and printing with a durable nylon material if I could get my hands on a reasonable existing foot to take measurements from. I've already developed models of 465/475 and 453/454 feet that are near identical replacements for the existing feet.


In exchange for the use of your foot, I'd be happy to provide a set of nylon printed feet gratis to upgrade your existing feet. I would then make these feet available to the community through the same channels I use for my 465/475 and 453/454 feet.


PM me if interested.


Thanks,
Jeff


________________________________
From: [email protected] <[email protected]> on behalf of Phillip Potter <p.potter@...>
Sent: Thursday, March 1, 2018 12:34 PM
To: [email protected]
Subject: [TekScopes] Back feet for 335 scope

Hello all,

The feet on the rear of my 335 are crumbling apart, literally!

I talked to Walter at Sphere and he has nothing even close, and searches
on the net reveal nothing... so, I am coming to the group to see if
there might happen to be someone who has any extra rear feet (Tek PN
348-0425-00) or even just one, that could be spared (or loaned?) to me
as an example of a complete foot? I don't know if they could be 3-D
printed or cast, but I don't have even one that is complete... mine are
all crumbled.

Here is a picture of what it looks like (borrowed from the internet):



Thanks for any suggestion or help you can provide.

Phil

Hi,
I have one of these with no disks, has anyone got a sample waveform disk they can upload to the files section please? I haven't checked what format the disks use, I guess an imaging tool such as Dave Dunfield ImageDisk would cater for it.

Regards,
John

Hi Jeff,

Are you N0dy?? If so, I just emailed you about your 400 series feet.

If your process is nondestructive, maybe we can get Lee H. (on list) to volunteer his one surviving complete foot for measurement...

I have a picture of the foot, upon which I have drawn (crudely) the measurements, that I will put that in my folder on the server:

/g/TekScopes/photo/33014/2?p=Name,,,20,1,0,0

If it comes to pass that Lee would allow you to measure and print out feet... he should probably be the one to receive your kind offer of printed feet, not me, but I would buy a set from you.

Phil

Hi all,


I'd be willing to undertake the 3D modelling and printing with a durable nylon material if I could get my hands on a reasonable existing foot to take measurements from. I've already developed models of 465/475 and 453/454 feet that are near identical replacements for the existing feet.


In exchange for the use of your foot, I'd be happy to provide a set of nylon printed feet gratis to upgrade your existing feet. I would then make these feet available to the community through the same channels I use for my 465/475 and 453/454 feet.


PM me if interested.


Thanks,
Jeff


________________________________
From: [email protected] <[email protected]> on behalf of Phillip Potter <p.potter@...>
Sent: Thursday, March 1, 2018 12:34 PM
To: [email protected]
Subject: [TekScopes] Back feet for 335 scope

Hello all,

The feet on the rear of my 335 are crumbling apart, literally!

I talked to Walter at Sphere and he has nothing even close, and searches
on the net reveal nothing... so, I am coming to the group to see if
there might happen to be someone who has any extra rear feet (Tek PN
348-0425-00) or even just one, that could be spared (or loaned?) to me
as an example of a complete foot? I don't know if they could be 3-D
printed or cast, but I don't have even one that is complete... mine are
all crumbled.

Here is a picture of what it looks like (borrowed from the internet):



Thanks for any suggestion or help you can provide.

Phil

Hi Lee,

I have been considering making a mold, but I am going to have to learn how... If I can figure out how to do that, without harming the example, I will get back to you on this...

Thanks for offering such a valuable piece... as it seems they are "unobtainium" these days!

Phil

Ps thanks to all who have made suggestions, so far... I am going to follow up on them.

On 2018-03-01 3:34 PM, Phillip Potter wrote:

Hello all,

The feet on the rear of my 335 are crumbling apart, literally!

I talked to Walter at Sphere and he has nothing even close, and searches
on the net reveal nothing... so, I am coming to the group to see if
there might happen to be someone who has any extra rear feet (Tek PN
348-0425-00) or even just one, that could be spared (or loaned?) to me
as an example of a complete foot?? I don't know if they could be 3-D
printed or cast, but I don't have even one that is complete... mine are
all crumbled.

Here is a picture of what it looks like (borrowed from the internet):

/g/TekScopes/photo/33014/1?p=Name,,,20,1,0,0

Thanks for any suggestion or help you can provide.

This is such a common malady that a few people have developed
replacement feet.

One reference is /g/TekScopes/message/144184

And I've bought a few sets from Fred Usack on ebay, and can vouch for
him (I don't know if he is on TekScopes):




These are for other models, but given some basic measurements, Fred (or
others) is likely able to produce feet that are compatible with your
model, even if not identical to the originals.

--Toby

Phil

Why not "print" a foot and use that
to make a mold. Then you can cast
them in more robust material.

73. Dick, W1KSZ

On Thu, Mar 1, 2018 at 1:59 PM, Malcolm Hunter <malcolm.r.hunter@...>
wrote:

It can be done. I've 3D printed feet for the 465 based on this model I
"designed" based on the original feet:
. Printed in PLA, they are
functional but I wouldn't bank on them holding out for every day use.
Someone with a bit of 3D modelling ability and an original foot should be
able to craft a suitable replacement for the 335 too. Printed in something
a bit more durable would work and even if they weren't as good as the
original, you could have plenty of spares.

Malc

On 1 March 2018 at 20:34, Phillip Potter <p.potter@...> wrote:

Hello all,

The feet on the rear of my 335 are crumbling apart, literally!

I talked to Walter at Sphere and he has nothing even close, and searches
on the net reveal nothing... so, I am coming to the group to see if there
might happen to be someone who has any extra rear feet (Tek PN

348-0425-00)

or even just one, that could be spared (or loaned?) to me as an example

of

a complete foot? I don't know if they could be 3-D printed or cast, but

I

don't have even one that is complete... mine are all crumbled.

Here is a picture of what it looks like (borrowed from the internet):

/g/TekScopes/photo/33014/1?p=Name,,,20,1,0,0

Thanks for any suggestion or help you can provide.

Phil

It can be done. I've 3D printed feet for the 465 based on this model I
"designed" based on the original feet:
. Printed in PLA, they are
functional but I wouldn't bank on them holding out for every day use.
Someone with a bit of 3D modelling ability and an original foot should be
able to craft a suitable replacement for the 335 too. Printed in something
a bit more durable would work and even if they weren't as good as the
original, you could have plenty of spares.

Malc

My 335 has ONE good, complete foot that I would loan out in the hope it might lead to the production of four new replacement feet.

Hello all,

The feet on the rear of my 335 are crumbling apart, literally!

I talked to Walter at Sphere and he has nothing even close, and searches on the net reveal nothing... so, I am coming to the group to see if there might happen to be someone who has any extra rear feet (Tek PN 348-0425-00) or even just one, that could be spared (or loaned?) to me as an example of a complete foot?? I don't know if they could be 3-D printed or cast, but I don't have even one that is complete... mine are all crumbled.

Here is a picture of what it looks like (borrowed from the internet):

/g/TekScopes/photo/33014/1?p=Name,,,20,1,0,0

Thanks for any suggestion or help you can provide.

Phil

On Thu, 1 Mar 2018 at 02:00 Francesco <madowax@...> wrote:

Ok I have checked the Voltage at Q1980 collector, with r1878 full CW (max
grid bias) = 60V, with r1878 full CCW (min grid bias) = 120V, so there is
the correct range but shifted of 13V more or less. Q1980 test good out of
circuit.

Well, this shifting does seem to be your problem - especially if you're
measuring this at power-on, as the slow start should increase the nominal
voltages by ~10V initially. So if you're measuring this in the "cold"
state, you're more like 20V low.

I don't know where this is coming from, but there aren't very many
candidates.
If R1994 has drifted low, that'd do it.
If R1881 or R1992 have drifted high, that'd do it.
If R1878, the grid bias pot had high contact resistance or resistance to
ground, that'd do it.
If C1991 was leaky, that'd do it.

I think you'd best trace this by the currents to and from the Q1980 base
node. By measuring the values of R1881, R1992 and R1994, then measuring the
voltage drop over them, you should be able to to suss this out.

Good luck,
Siggi

forget to add some pictures:

Use this picture to make the scale. Think new scale looks good and will work. Make 3 different types to try the illumination under the scale.
I think the better one will be with the foil on bottom of the scale , but will try all.
Now will try to find a time to make new metal knob and to install all.
Thanks to all!

Measurements are taken at power on.

Ok I have checked the Voltage at Q1980 collector, with r1878 full CW (max grid bias) = 60V, with r1878 full CCW (min grid bias) = 120V, so there is the correct range but shifted of 13V more or less. Q1980 test good out of circuit.

Also some plug-ins like the ubiquitous 7B53A used chiefly in 76xx
mainframes have no built in illumination anyway so adding the lamp
power modification to the mainframe makes no difference for them.

Thankyou Roger and Menahem for your recommendations ... my Scope has run trouble free for quite few hours now ... and I am discovering its functionality is more complex than my el cheapo scope .... :)

Cheers,
Ian

Using the TM500 PSU / back plane as a standalone card tester :
I did the same as Edward some years ago before I made up my own (TM503 )
plug in metal frame extenders, (turned out to be a fiddly job) which fully supports the cable and card plug
But one thing to watch out for when just using the PSU/card cage is that, without
the TM500 case, the card alignment plastic slot(s) are not there to hold the card in, and it can easily
fall out of the socket, especially when you re position the PSU to get at a test connection, so you
might be back to square one. When I could, I used thin plastic tubing to tie/hold the cable plug in at that time
Rgds
John

The easy way for people to add to a database is right here in the group. Create a Database here.

I was going to say yesterday, they should have just sent you a new nozzle and tube. At least they finally wised up. And yup, I meant both ends of the tube, you got me! =)
--Eric
Sent from my Samsung Galaxy S8.