Test Equipment Anonymous (TEA) group therapy thread

[K0ELB]

If I were a betting man, I’d say it’s the European made Type 53/54B.
Per the Tekwiki:
“ Like Type A, Type B has its roots in the 1954 introduction of the 531 and 535, as the five-tube Type 53B, with 1x bandwidth of DC to 10MHz (limited by the mainframe) and 10x-AC bandwidth of 2 Hz to 9 MHz.”

Which is exactly what is on that plugin. https://w140.com/tekwiki/wiki/B

—-edited to add more information—-

[factory]

There is no Tek 735 on the wiki, looks more like an early 535 or 545 to me. 

David

[bsdphk]

Sorry, typo!  Yes, it's a 535

[Vince]

I never heard of a 735 Tek scope ? Are you sure ?

Looks 100% to me like a bog standard 535 scope, an early one, pre-round cabinet.

Neither Google nor Tekwiki know of a 735 Tek tube scope, but I am all for learning new exciting stuff if it did actually exist ! 

The 535 is good for 10MHz, 15MHz depending on serial number.

https://w140.com/tekwiki/wiki/535

The plug-in is easy, no room for error. It's a type 53B, good for 10MHz tops, it's even written on it, see your picture ! 

https://w140.com/tekwiki/wiki/B


EDIT : messages collided... OK so no mystery 735  then...

[med6753]

The S/N for that early Type 535 is directly under the word "Oscilloscope". It can't be seen in the photo because it is stamped.

[K0ELB]

Here’s a 53B that’s on the bay that matches your pic perfectly. It’s quite possible that the one in the op is a Portland made one, as the name is on the left side and not the right.

[Wolfgang]

Some more import TEA related acronyms:

VPNHAGANE - Vintage Products Not Half As good As New Equipment
UWTERS - Unworthy Test Equipment Repair Syndrome
MPIFOAS - Mega Precision Instrument Far Off Any Standard

[Zucca]

In case you missed it...

https://www.eevblog.com/forum/buysellwanted/fs-(us-to-xx)-tek-afg3252-like-new-single-owner-$3k/

It will be hard to sell, to expect the price to go down...

[TERRA Operative]

Calling out to my American friends! I'm in need of some inch size screws, something which is almost unobtanium here in Japan........

If someone can grab some packs of these screws (and appropriate thread taps too) next time you are at the hardware store or making an order from McMaster Carr and stick them in a parcel to send my way, I have Paypal ready and I'd love you long time. 

Flat or oval head (countersunk) slotted machine screws, zinc plated or similar:
6-32, 3/16 long
6-32, 5/16" long
6-32, 3/4" long
10-24 1/4" long
5/16-18, 1/2" long (ideally 3/16" long if available)

For this thing I made. 
https://www.thingiverse.com/thing:6607366



Also @Vincent, some development on one of your old threads!
https://www.eevblog.com/forum/repair/vintage-chip-programmer-micropross-rom-3000u/msg5484001/#msg5484001

[Vince]

Calling out to my American friends! I'm in need of some inch size screws, something which is almost unobtanium here in Japan........
If someone can grab some packs of these screws (and appropriate thread taps too) next time you are at the hardware store or making an order from McMaster Carr and stick them in a parcel to send my way, I have Paypal ready and I'd love you long time. 

Flat or oval head (countersunk) slotted machine screws, zinc plated or similar:
6-32, 3/16 long
6-32, 5/16" long
6-32, 3/4" long
10-24 1/4" long
5/16-18, 1/2" long (ideally 3/16" long if available)

No worries ! I will just send you a couple of my old Tek tube scopes and you can salvage all the imperial screws you want !

For this thing I made. 
https://www.thingiverse.com/thing:6607366

A 3DP NUKE BOMB ?!!    and I thought I was a strange ! 

Also @Vincent, some development on one of your old threads!
https://www.eevblog.com/forum/repair/vintage-chip-programmer-micropross-rom-3000u/msg5484001/#msg5484001

Blimey it's a miracle !!! 
... and I didn't even know about it because somehow I was no longer subscribed to my own topic ?! 
It's fixed now. Thank you so much for the pointer because otherwise it could have been months or a year before I resumed work on this project / looked at that thread again !!! 

[TERRA Operative]

Well, I do love the Fallout video games, and my son and I are doing a Fallout 3 play through and this is his favourite weapon (big boom is much fun. ) coupled with the recent Fallout TV show got me all motivated to make the Mini Nuke.

[Robert763]

Why not just use the nearest size metric screws? Is there something critical about it?

Robert

[Zoli]

Calling out to my American friends! I'm in need of some inch size screws, something which is almost unobtanium here in Japan........

If someone can grab some packs of these screws (and appropriate thread taps too) next time you are at the hardware store or making an order from McMaster Carr and stick them in a parcel to send my way, I have Paypal ready and I'd love you long time. 

Flat or oval head (countersunk) slotted machine screws, zinc plated or similar:
6-32, 3/16 long
6-32, 5/16" long
6-32, 3/4" long
10-24 1/4" long
5/16-18, 1/2" long (ideally 3/16" long if available)

For this thing I made. 
https://www.thingiverse.com/thing:6607366
...

I'll bite, if there no other volunteers, but until then: quantities? slot-head is negotiable(to Phillips/etc.)? 5/16-18 I suppose you mean 3/8" is the ideal length, not 3/16"... I'm asking, since I already have some of the stuff(6-32&10-24 tap, some/maybe all of 6-32PH flat head SS screws). PM if interested.

[TERRA Operative]

The screws have to be imperial and gotta be slotted, otherwise it's not true to the original design. Gotta keep it accurate to the 'real' in-game design! 
Plated steel is the material I'm looking for, I'll settle for zinc plating as the usual Mil-spec cadmium is not so suitable for general use in the home.

I found I can buy a set of taps here in Japan, so that's covered.

For the 5/16-10 screws I do actually need 3/16" long as they are decorative screws going into a part with 3/16" (4.762mm) wall thickness, but they are probably not available, so longer is fine and I'll cut them down.

For quantities, I guess standard packaging quantities is ok.
Here is the minimum I need for each size, to make one complete assembly:
- 16 of 6-32, 5/16" long
- 8 of 10-24 1/4" long
- 6 of 5/16-18, 1/2" long (or shortest available unless we can find 3/16" long screws).
- 8 of 6-32, 3/4" long
- 16 of 6-32, 3/16 long

[Zoli]

The screws have to be imperial and gotta be slotted, otherwise it's not true to the original design. Gotta keep it accurate to the 'real' in-game design! 
Plated steel is the material I'm looking for, I'll settle for zinc plating as the usual Mil-spec cadmium is not so suitable for general use in the home.

I found I can buy a set of taps here in Japan, so that's covered.

For the 5/16-10 screws I do actually need 3/16" long as they are decorative screws going into a part with 3/16" (4.762mm) wall thickness, but they are probably not available, so longer is fine and I'll cut them down.

For quantities, I guess standard packaging quantities is ok.
Here is the minimum I need for each size, to make one complete assembly:
- 16 of 6-32, 5/16" long
- 8 of 10-24 1/4" long
- 6 of 5/16-18, 1/2" long (or shortest available unless we can find 3/16" long screws).
- 8 of 6-32, 3/4" long
- 16 of 6-32, 3/16 long

5/16" screws: the countersink part is ~.19" thick for 82°(standard) heads; your wall thickness is .1875"; do you intend to help them with some glue, or thicken up the wall in that areas?
Price: if I have to order everything, its closing on $50.00 CAD; Monday evening(Tuesday morning for you) I can tell you what I have in the drawers/Kanban(for free).

[TERRA Operative]

Yeah, it's pretty tight, those screws would support the internal stuff were it 'real', so maybe some nuts are in order to hold them in place.

I'll PM you from here on out to avoid filling this thread with off-topic stuff.

[TERRA Operative]

Gotta love a custom test fixture.
Spending 2 hours fixing a 5 minute problem is a net positive, right? 

It's nothing more than a few switches and a resistor on a box, but will make playing with stuff much easier. 

At least now I can calibrate this peak to peak detector, then characterise it, then finally compare to my design, and spin a rev.2 to fix all my errors and assumptions. 

[Vince]

Wow looks really well made, nice job! 

[factory]

I think CuriousMarc had it far too easy with his HP 5264A plug-in, this is the better condition one I have, the "Aux input" was rather deaf, due to a shorted 2N274 on the input amp board, in went an AF126 taken from a radio PCB.



It's now working in all modes except "preset". Hopefully this is a worthwhile use of the 1000 second gate time mod and the 100Kc output from the Bedford 5245L, using the divide by N mode. 



The second one is still a work in progress, with many faults, so far I've replaced the two shattered preset divider boards, repaired several tracks on the gate control board, replaced a few missing or damaged parts on the same board, replaced a shattered connector and replaced an open 1850-0062 transistor & diode on the trigger board. 







Currently waiting for some nut drivers from Mouser to take the thumbwheel switches apart, as I'm having problems with open switch contacts, where it's been sitting at 00000 for several decades.



David

[Vince]

Your dedication to getting these old HP counters going is remarkable and well appreciated... they are so worth it, they look just so sexy, I can't get enough of looking at them, it's hypnotizing...

[Robert763]

Twenty years ago you could hardly give these old counters away........

[Vince]

How times change eh ?! 

I guess I am 20 years late then, oh well...

David, see pic below... just found this yesterday while sorting through my stuff.
I had zero recollection I had this thing.

It's an old HP thing so maybe you know about it ?

Apparently a "logic probe", it says on the tin... model 10525A.

It's got a BNC at one end, and a threaded bit at the tip.
So I guess one is supposed to screw attachments to it, of which I have none, so the thing is probably useless...

Anyway, might still interest someone for parts.. seeing as accessories for vintage TE are 100 times more difficult to find than the TE itself, isn't it.

Free to a good home within the EU.
For price of shipping anywhere else. It's small enough that I can shove it in a padded envelope so should be cheap to send as regular mail I guess.

Going to the trash if no interest... zero use for this. 

[factory]

The HP logic probes with BNC power connector, some of the IC based counters such as the 5326/7 range & the 5340A, have a BNC connector inside for use with these, otherwise a BNC to banana plug adaptor & +5V supply can be used.

It's missing the clear plastic cover for the lamp, tips are possibly the same as the later ones such as the 10525T I have, but the 10525A seems to be the first one from around 1969, rated for up to 20MHz with DTL,TTL logic; http://hparchive.com/Journals/HPJ-1969-06.pdf
The "A" version disappears in 1973 and was replaced with the 50MHz 10525T, they also introduced two more for higher logic levels of HTL, MOS etc. (10525H) and negative logic of ECL (10525E), that is two more for me to search for..... 

I'm not sure I have a 10525A in my collection of HP logic troubleshooting accessories, definitely have the T version but it's the H05 version with extra long power lead.

David

[TERRA Operative]

I have a Tek logic probe sitting on the shelf, bought it cheap because I thought it was cool, but never used it yet. Got too many scopes that show me way more than a logic probe can.

[Vince]

Thanks for the info David. Let me know if you might be interested in the remains of mine to enrich your collection... I think I will keep it for a few days then it will dispose of it ....