Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 3429303 times)

tonyalbus, URI, Ismo, med6753, Cloud, K0ELB (+ 1 Hidden) and 15 Guests are viewing this topic.

Offline mnementh

  • Super Contributor
  • ***
  • Posts: 9114
  • Country: ca
  • *Escaping The Suck*
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69750 on: September 18, 2020, 01:34:59 pm »
While the capacitors still look ok, I cannot tell if they indeed are.

From the 1980s? It's safe to assume they aren't.

Why?
There is no real wear-out mechanisim for plastic film capacitors of this era. Apart from manufacturing defects or overloading there is no resaon for these to fail. Even the stacked plate ones that were sawn up and not encapsulaed don't seem to fail.
People seem to think that because Rifa sealf-healing caps and some electrolytics are known to fail that all capacitors will die.
The quality wound plastic film capacitors only real faiure is when they have been subjected to excessive voltage, dV/dt or current. These are unlikely in a crossover.
Don't tar all capacitors with th Rifa brush.

The problem is they are often difficult to identify; metallized paper axials look very similar, and confusion there adds to the body of evidence that all capacitors are suspect above a certain age. Add to that the fact that we don't know the exact chemistry of the plastics involved in those "old" plastic film caps, and there can be some properly placed misgivings about whether those plastics have begun to break down with age over the course of decades.

The problem with caps in general is that there is a fair measure of voodoo in their construction and application to the average electronics nerd; even engineers can be ignorant of things like how electrically fragile tantalum caps can be or how critical is the difference in derating curve for MMLCCs vs other types, how ESR vs ripple rejection ratings apply in a brute force filter, and how different kinds of caps in parallel can interact on a power rail vs signal path.

I'm certain there are easily a dozen other critical considerations as well that I'm just not thinking of;
I'm still right about here on my first cuppa.   

Bottom line is Tesla's ghost lives in each and every one of them; plus he's pissed off and a little bit crazy. You NEVER know when SOMETHING is gonna drive one over the edge.  :-DD

mnem
MAXIM # 9. Capacitors are Murphy's Footsoldiers.
« Last Edit: September 18, 2020, 01:37:00 pm by mnementh »
 
The following users thanked this post: Neomys Sapiens, bd139

Offline AVGresponding

  • Super Contributor
  • ***
  • Posts: 1250
  • Country: england
  • Exploring Rabbit Holes Since The 1970s
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69751 on: September 18, 2020, 01:35:20 pm »
The quality wound plastic film capacitors only real faiure is when they have been subjected to excessive voltage, dV/dt or current. These are unlikely in a crossover.

Given the volume levels Saskia likely drives them at, I wouldn't count on it!   :-DD



Parcel day in HB, clearly. Picked up one from Hobby King at the Post Office, not TE I know but will be a lot of fun when I get my Tamiya Monster Beetle running with a new brushless motor/esc combo. 12T ftw... Should be good for wheelies off the line, assuming the tyres don't rip clean off the rims.   8)

TE delivery is the HP 66311B. You can tell it's an HP, because it appears to be made out of pure neutronium!   :scared:
It's 1/2 rack width, 2U high, full depth, and weighs 10kg if it weighs a gram. Fortunately the seller is an experienced TE dealer and it was extremely well packed.   :phew:
Teardown pics to follow this weekend, if I have time.



EDIT: Rather annoyingly the Hobby King parcel had been opened and not resealed. Because for some reason best known to themselves, HK stuck a Li-ion caution label on the package.
No batteries were present, of any chemistry.   :-//
« Last Edit: September 18, 2020, 01:39:35 pm by AVGresponding »
nuqDaq yuch Dapol?
Addiction count: AVO-BlackStar-Fluke-Hameg-HP-Keithley-IsoTech-Mastech-Micronta-Solartron-Tektronix-Thurlby-TTi-UniT
 
The following users thanked this post: mnementh, Specmaster, bd139, Kosmic, tonyalbus

Online BravoV

  • Super Contributor
  • ***
  • Posts: 7081
  • Country: 00
  • +++ ATH1
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69752 on: September 18, 2020, 01:50:56 pm »
Just got a private message recently thru Whatsapp from my local industrial complex recyler/salvager company, as I'm their regular addict buying customer.  :palm:

Them : Dude, got a new toy here, from our latest recyling from a factory, for you since you're regular, its cheeeepp  >:D
Me : Huh ? Whats that ?
Them : You do like zapping stuffs with high voltage right ? (last time they gave me a NOS 15KV neon sign transformer, as a gift (free) as part of the deal I made)
Me : Hmm .. well .. sort of and depends, but again whats that ?
Them : Its made in Korea, its quite heavy too, about 9kg (20lbs), and you do like heavy electronic stuffs right ?
Me : ... (Oh no, damn it  :'( ... they know my weak heart on these kinda things) ..
Them : It does output 0-5kV, and inside it has a big transformer "AND" a variac, want it ?
Me : ... (reading the words big transformer "AND" variac inside really ignited my interest) ...

... and later on ... after many chats exchanges, photos and bargaining ... for about $27 ... here I am with this thing.  ::)

As usual, don't need it, but at least I've done my obligatory TEA ritual properly, that hopefully made TEA's GOD happy, and getting closer to the promised TEA heaven gate, am I ?  :scared:  :palm:

Tear down photos coming next.

 
The following users thanked this post: BU508A, mnementh, Specmaster, Neomys Sapiens, bd139, ch_scr, Kosmic, AVGresponding, tonyalbus

Offline mnementh

  • Super Contributor
  • ***
  • Posts: 9114
  • Country: ca
  • *Escaping The Suck*
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69753 on: September 18, 2020, 02:22:37 pm »
Mmmm.... tasty. Sortof like a AC voltage source for a Megger, built out in its own box, eh...?

Plus... the film still over the display. You get to do the peel...  >:D

mnem
Linus peels a Quadro GPU (you wanna turn up the volume on the embedded vid a bit to hear the glee  ;)):   

https://twitter.com/linustech/status/1234629981839314945?lang=en
« Last Edit: September 18, 2020, 02:24:36 pm by mnementh »
 
The following users thanked this post: BravoV

Offline mnementh

  • Super Contributor
  • ***
  • Posts: 9114
  • Country: ca
  • *Escaping The Suck*
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69754 on: September 18, 2020, 02:54:44 pm »
I suggest using it to keep the house warm post brexit.

MSDN library from that era is probably worth a few quid however.

Edit: I sold some MSDOS 6.22 media untested on floppy a couple of years back for £40 so there may be a market for such stuff.

I had to dig out a DOS 6.22 installation disk earlier this year to repair a R&S CRTU / CMU200. The software installer, specifically the boot manager, will only run if the disk boots to Dos 6.22 first. That also needed a PC with a 3.5" floppy and a PATA/IDE HDD intterface.

It goes back further than windows. Industries like aerospace have product life cycles many times longer than a operating system or even computer hardware platforms. There are still test rigs running PDP 11 / Q-Bus based interface cards and software. The cost of re-writing  and more importantly validating this software on modern computers, assuming suitable interface cards are available, is prohibitive even for aerospace. As a result there are companines selling replacement machines e.g. Logical https://logical-co.com/nupdpq/ . I know for sure that the A320 series fuel system rig is still running on Q-Bus interface cards and a VT-220 terminal.

A couple of years ago there were job ads for people to work on pdp11s in nuclear plants. Expected withdrawal date 2038,  which is either the Unix time rollover or the plants lifetime.

One of the tek 1502s (b?) was specified in aircraft repair manuals. Somebody has built something new which duplicates the functionality and interface, and is apparently regarded as a dropin in substitute.
I hope fervently that nobody discovers my familiarity with the Siemens M-series. Those are strange machines.



In present company, you're ashamed of being too familiar with this...?  ???

It also appears you aren't the only one who has a unnatural relationship with their espresso machine...  >:D

https://www.nabto.com/the-coffeepi-part-1-of-2/

mnem
Dang.... now I'm missing bean again...

 

Online tonyalbus

  • Frequent Contributor
  • **
  • Posts: 559
  • Country: nl
  • To better understand, you need to open it ;-)
    • My Channel
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69755 on: September 18, 2020, 03:17:05 pm »
Not a counter.  :-DD

8600A was cheap..status unknown, but display works..
8200A was not cheap i actualy bidded up-to my max i almost stepped out...Then the seller said he watched my movies and he stopped the bidding and sold it to me :-)
But the NIXIES are still bright and teh meter seems to work fine,,,

Electronics enthusiast, TEA and Radio Amateur (PE1ONS)
Marconi 2955/2432A/2414A - TTi TF930/TF600/TG102 - HP5302/5315/5323/5385/3478 - Fluke 8000/8010/8125 - SDS1202X-E -XDM2041 - TEK 475 - Anritsu MS610/MF1603 - Keitley 199 - PM2521/2522/2527
https://www.youtube.com/channel/UCwLPcv2xiA3D9lfGArF58ww
 
The following users thanked this post: med6753, mnementh, Specmaster, capt bullshot, factory, Kosmic, AVGresponding

Offline Kosmic

  • Super Contributor
  • ***
  • Posts: 1595
  • Country: ca
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69756 on: September 18, 2020, 03:18:16 pm »
Hahahahaha thank you  :-DD

One down, 20 million to go  8)
Those squirrel problems are spreading over here. My s.o. was bombarded by one with acorns just a few days ago.

I saw a Buse chasing squirrels in the backyard recently. First time I'm seeing one of those around, since I'm in a big urban area. That might fix the squirrels problem for a while.
« Last Edit: September 18, 2020, 03:24:12 pm by Kosmic »
 
The following users thanked this post: mnementh

Offline mnementh

  • Super Contributor
  • ***
  • Posts: 9114
  • Country: ca
  • *Escaping The Suck*
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69757 on: September 18, 2020, 03:24:00 pm »
The quality wound plastic film capacitors only real faiure is when they have been subjected to excessive voltage, dV/dt or current. These are unlikely in a crossover.
...Given the volume levels Saskia likely drives them at, I wouldn't count on it!   :-DD

Actually, given that these are used speakers which have passed through many hands before our resident audiophreak got hold of them... and we know they've been rode hard & put away wet more than a few times, just from her description... this is not even close to a reasonable assumption.

We have no idea who may have hooked what amplifier to these; given the utterly vapid nature of 90% of the wannabe audiophiles whose skeevy little mitts may have gotten hold of them, they could have been connected to anything from a Soundstream Tarantula to a BOGEN PA amp set-up in line-voltage mode without a transformer to any of oodles of tube amps with Ifni knows how much DC voltage leaking across the outputs.

Speaking as a veteran survivor of a thousand stereo repairs... 
There is no limit to the damage an idiot with a little electronics knowledge can do.   

mnem
« Last Edit: September 18, 2020, 03:25:40 pm by mnementh »
 
The following users thanked this post: tonyalbus

Offline Kosmic

  • Super Contributor
  • ***
  • Posts: 1595
  • Country: ca
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69758 on: September 18, 2020, 03:46:19 pm »
Found this little guy on Ebay. Wiltron sweeper, 2-12.4Ghz. Asking price was 90$. I figured that worst case if it was impossible to fix, I would have a lot of cool microwave components. Overall the unit was really thirty but in good shape.



Of course the bumpers the back were destroyed during shipping. I would have to print a new set.



First time I'm seeing the inside of one of those, but I'm impressed, really well made. Everything is easily accessible and you can easily remove all the modules / cards for closer inspection.



Got an old Schaffner filter from 1990. Now should I replace it or not ?



Everything looked good inside so I powered the instrument, and of course 2 Tantalum caps were definitely not happy about that and decided to commit suicide.



After replacing the caps, all self-tests are green and .... we have a signal !



Phase noise is not that bad.



Sweeping a (not so great) 5.8Ghz High pass filter.



Sweeping a (pretty good) 3.9Ghz band pass filter.



Overall I really like Wiltron instruments. Good construction and really good service manual.
« Last Edit: September 18, 2020, 03:56:48 pm by Kosmic »
 

Offline Fungus

  • Super Contributor
  • ***
  • Posts: 11199
  • Country: 00
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69759 on: September 18, 2020, 03:49:35 pm »
While the capacitors still look ok, I cannot tell if they indeed are.

From the 1980s? It's safe to assume they aren't.

Why?

If they're tantalums, well ... it was a bad era for tantalums.

If they're electrolytics, they're likely to be drying up and/or ready to leak.

There is no real wear-out mechanisim for plastic film capacitors of this era.

Plastics are probably OK... but if you mentioned they were plastic, I missed it.
 

Online tonyalbus

  • Frequent Contributor
  • **
  • Posts: 559
  • Country: nl
  • To better understand, you need to open it ;-)
    • My Channel
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69760 on: September 18, 2020, 03:49:43 pm »
Super cool...
Electronics enthusiast, TEA and Radio Amateur (PE1ONS)
Marconi 2955/2432A/2414A - TTi TF930/TF600/TG102 - HP5302/5315/5323/5385/3478 - Fluke 8000/8010/8125 - SDS1202X-E -XDM2041 - TEK 475 - Anritsu MS610/MF1603 - Keitley 199 - PM2521/2522/2527
https://www.youtube.com/channel/UCwLPcv2xiA3D9lfGArF58ww
 

Offline Ice-Tea

  • Super Contributor
  • ***
  • Posts: 2007
  • Country: be
    • Freelance Hardware Engineer
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69761 on: September 18, 2020, 03:56:55 pm »
Replace the Schaeffner. Like, now.
 
The following users thanked this post: mnementh, Specmaster, wolfy007, ch_scr

Offline AVGresponding

  • Super Contributor
  • ***
  • Posts: 1250
  • Country: england
  • Exploring Rabbit Holes Since The 1970s
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69762 on: September 18, 2020, 04:02:59 pm »
Not a counter.  :-DD

8600A was cheap..status unknown, but display works..
8200A was not cheap i actualy bidded up-to my max i almost stepped out...Then the seller said he watched my movies and he stopped the bidding and sold it to me :-)
But the NIXIES are still bright and teh meter seems to work fine,,,

Probably still meets its specs too, my 8300A is spot on! Another nixie meter saved from the steampunk clock wankers!

Just been reading the manual for my latest toy TE, looks like I got a really nice precision PSU for the money, though the 15V max is a bit low, it's fine for most of what I'll need it for.
The fan is a bit noisy, and the big knob is missing (fnarr fnarr), but a light clean will see it good as new.
I don't suppose anyone has a spare knob? The shaft is a standard 1/4"/6.3mm jobby with flat.
nuqDaq yuch Dapol?
Addiction count: AVO-BlackStar-Fluke-Hameg-HP-Keithley-IsoTech-Mastech-Micronta-Solartron-Tektronix-Thurlby-TTi-UniT
 
The following users thanked this post: wolfy007, tonyalbus

Offline Kosmic

  • Super Contributor
  • ***
  • Posts: 1595
  • Country: ca
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69763 on: September 18, 2020, 04:09:49 pm »
Replace the Schaeffner. Like, now.

Wait what ? can't see your message with all the smoke!
 
The following users thanked this post: SilverSolder, mnementh, ch_scr

Online bd139

  • Super Contributor
  • ***
  • Posts: 16525
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69764 on: September 18, 2020, 04:10:15 pm »
Not a counter.  :-DD

8600A was cheap..status unknown, but display works..
8200A was not cheap i actualy bidded up-to my max i almost stepped out...Then the seller said he watched my movies and he stopped the bidding and sold it to me :-)
But the NIXIES are still bright and teh meter seems to work fine,,,

Probably still meets its specs too, my 8300A is spot on! Another nixie meter saved from the steampunk clock wankers!

Just been reading the manual for my latest toy TE, looks like I got a really nice precision PSU for the money, though the 15V max is a bit low, it's fine for most of what I'll need it for.
The fan is a bit noisy, and the big knob is missing (fnarr fnarr), but a light clean will see it good as new.
I don't suppose anyone has a spare knob? The shaft is a standard 1/4"/6.3mm jobby with flat.


Good good. Keysight still sell the knobs for those - part is 33120-87401. They're £2.60 + VAT a pop. Delivery is free. Phone up Keysight UK sales and they will sort you one out. Usually get some random from Spain phone you back for card details and it'll arrive in about 3-4 days.

https://www.keysight.com/my/partDetail/33120-87401

It's quite scary how much old HP stuff you can get new parts for.

Edit: buy a few if you're going to because you can bounce the fuckers on ebay for £15 a go  :-DD :-DD :-DD
« Last Edit: September 18, 2020, 04:18:56 pm by bd139 »
 
The following users thanked this post: mnementh, AVGresponding, tonyalbus

Offline Cubdriver

  • Supporter
  • ****
  • Posts: 2953
  • Country: us
  • Nixie addict
    • Photos of electronic gear
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69765 on: September 18, 2020, 04:55:56 pm »
Not a counter.  :-DD

8600A was cheap..status unknown, but display works..
8200A was not cheap i actualy bidded up-to my max i almost stepped out...Then the seller said he watched my movies and he stopped the bidding and sold it to me :-)
But the NIXIES are still bright and teh meter seems to work fine,,,

Damn, Tony - that 8200A looks brand new!!  Beautiful!   :-+ :-+ :-+ :-+

-Pat
If it jams, force it.  If it breaks, you needed a new one anyway...
 
The following users thanked this post: tonyalbus

Offline Robert763

  • Frequent Contributor
  • **
  • Posts: 256
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69766 on: September 18, 2020, 04:57:37 pm »
While the capacitors still look ok, I cannot tell if they indeed are.

From the 1980s? It's safe to assume they aren't.

Why?

If they're tantalums, well ... it was a bad era for tantalums.

If they're electrolytics, they're likely to be drying up and/or ready to leak.

There is no real wear-out mechanisim for plastic film capacitors of this era.

Plastics are probably OK... but if you mentioned they were plastic, I missed it.

They are not mine, but Saskia says they are MKTs which are plastic. The point is why would you suggest components will have failed when you haven't even read th po to find what type they are or what the application is.  |O
 

Offline Cerebus

  • Super Contributor
  • ***
  • Posts: 5752
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69767 on: September 18, 2020, 04:58:54 pm »
It's quite scary how much old HP stuff you can get new parts for.

Don't say that out loud or some fuckwit management type at Keysight is gonna hear you and figure out a way to reduce costs by cutting inventory.

It's the commitment to doing things like keep decent stock of spares for a decent period of time that is what made choosing HP a no-brainer back in the day. With all the mergers, takeovers, demergers and other f'ing about in recent years I don't have the confidence in anything that was once part of HP in the way I used to have confidence in HP back before the f'ing about started.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
The following users thanked this post: bd139

Offline Neomys Sapiens

  • Super Contributor
  • ***
  • Posts: 1944
  • Country: de
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69768 on: September 18, 2020, 05:10:06 pm »
I suggest using it to keep the house warm post brexit.

MSDN library from that era is probably worth a few quid however.

Edit: I sold some MSDOS 6.22 media untested on floppy a couple of years back for £40 so there may be a market for such stuff.

I had to dig out a DOS 6.22 installation disk earlier this year to repair a R&S CRTU / CMU200. The software installer, specifically the boot manager, will only run if the disk boots to Dos 6.22 first. That also needed a PC with a 3.5" floppy and a PATA/IDE HDD intterface.

It goes back further than windows. Industries like aerospace have product life cycles many times longer than a operating system or even computer hardware platforms. There are still test rigs running PDP 11 / Q-Bus based interface cards and software. The cost of re-writing  and more importantly validating this software on modern computers, assuming suitable interface cards are available, is prohibitive even for aerospace. As a result there are companines selling replacement machines e.g. Logical https://logical-co.com/nupdpq/ . I know for sure that the A320 series fuel system rig is still running on Q-Bus interface cards and a VT-220 terminal.

A couple of years ago there were job ads for people to work on pdp11s in nuclear plants. Expected withdrawal date 2038,  which is either the Unix time rollover or the plants lifetime.

One of the tek 1502s (b?) was specified in aircraft repair manuals. Somebody has built something new which duplicates the functionality and interface, and is apparently regarded as a dropin in substitute.
I hope fervently that nobody discovers my familiarity with the Siemens M-series. Those are strange machines.



In present company, you're ashamed of being too familiar with this...?  ???

It also appears you aren't the only one who has a unnatural relationship with their espresso machine...  >:D

https://www.nabto.com/the-coffeepi-part-1-of-2/

mnem
Dang.... now I'm missing bean again...
Not exactly. And no, not the mobile phones either.

The process control computer series which was finally named Siemens Sicomp-M and which is behind anything nuclear build/supplied by Siemens in the special safety modified versions. Process control computers with votong logic in the HW.
 

Online med6753

  • Super Contributor
  • ***
  • Posts: 6891
  • Country: us
  • Tek nut
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69769 on: September 18, 2020, 05:17:45 pm »
Replace the Schaeffner. Like, now.

Wait what ? can't see your message with all the smoke!

If his mains were 240V I agree, change it now. But it seems those filters rarely blow with mains of 120V which is what he has.
An old gray beard with an attitude.
 

Offline factory

  • Frequent Contributor
  • **
  • Posts: 499
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69770 on: September 18, 2020, 05:18:47 pm »
Just got a private message recently thru Whatsapp from my local industrial complex recyler/salvager company, as I'm their regular addict buying customer.  :palm:

Them : Dude, got a new toy here, from our latest recyling from a factory, for you since you're regular, its cheeeepp  >:D
Me : Huh ? Whats that ?
Them : You do like zapping stuffs with high voltage right ? (last time they gave me a NOS 15KV neon sign transformer, as a gift (free) as part of the deal I made)
Me : Hmm .. well .. sort of and depends, but again whats that ?
Them : Its made in Korea, its quite heavy too, about 9kg (20lbs), and you do like heavy electronic stuffs right ?
Me : ... (Oh no, damn it  :'( ... they know my weak heart on these kinda things) ..
Them : It does output 0-5kV, and inside it has a big transformer "AND" a variac, want it ?
Me : ... (reading the words big transformer "AND" variac inside really ignited my interest) ...

... and later on ... after many chats exchanges, photos and bargaining ... for about $27 ... here I am with this thing.  ::)

As usual, don't need it, but at least I've done my obligatory TEA ritual properly, that hopefully made TEA's GOD happy, and getting closer to the promised TEA heaven gate, am I ?  :scared:  :palm:

Tear down photos coming next.

That looks like a flash tester, or AC insulation breakdown tester, I got a 5kV Clare one in the big pile of test gear I acquired last month, question is did you get the test leads with it?

David
 

Online med6753

  • Super Contributor
  • ***
  • Posts: 6891
  • Country: us
  • Tek nut
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69771 on: September 18, 2020, 05:23:17 pm »
Now it looks like my next project will arrive Saturday rather than Monday. Coming from Ohio via FedEx. I'll reveal when it shows up.

Not sure if I'll be on Discord tomorrow. Lady Copper arriving today for the weekend. But we have no plans other than to just hang out here. If I do log in I'll have to be on my best behavior.  :-DD 
Of course, you'll have to be on your best behaviour or else the lady cop might just put her own cuffs on you, the not fancy but purely functional ones  :-DD

Well it turns out she called me after I posted this morning. She did not feel well last night with some sort of stomach bug and was hoping she'd feel better this morning. Not the case. She called out of work today and won't be coming up this weekend. She'll come up next weekend. So.....I can resume my bad boy activities and the first thing I did was go back to bed and nap for a few hours. Such a rebel I am.  >:D :P :-DD 
An old gray beard with an attitude.
 
The following users thanked this post: mnementh, Specmaster, ch_scr

Offline factory

  • Frequent Contributor
  • **
  • Posts: 499
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69772 on: September 18, 2020, 05:34:58 pm »
Just been reading the manual for my latest toy TE, looks like I got a really nice precision PSU for the money, though the 15V max is a bit low, it's fine for most of what I'll need it for.
The fan is a bit noisy, and the big knob is missing (fnarr fnarr), but a light clean will see it good as new.
I don't suppose anyone has a spare knob? The shaft is a standard 1/4"/6.3mm jobby with flat.


Good good. Keysight still sell the knobs for those - part is 33120-87401. They're £2.60 + VAT a pop. Delivery is free. Phone up Keysight UK sales and they will sort you one out. Usually get some random from Spain phone you back for card details and it'll arrive in about 3-4 days.

https://www.keysight.com/my/partDetail/33120-87401

It's quite scary how much old HP stuff you can get new parts for.

Edit: buy a few if you're going to because you can bounce the fuckers on ebay for £15 a go  :-DD :-DD :-DD

Not really surprised they still sell that part as the 66311B is still available too;
https://www.keysight.com/en/pd-1000001614%3Aepsg%3Apro-pn-66311B/mobile-communications-dc-source-15v-3a?cc=US&lc=eng

David
 

Offline mansaxel

  • Frequent Contributor
  • **
  • Posts: 944
  • Country: se
  • SA0XLR
    • My very static home page
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69773 on: September 18, 2020, 05:35:52 pm »
Replace the Schaeffner. Like, now.

Wait what ? can't see your message with all the smoke!

If his mains were 240V I agree, change it now. But it seems those filters rarely blow with mains of 120V which is what he has.

Who are you and what have you done with the grump-smurf?  The real med would NEVER recommend against "symphony-of-blunderbusses" style changing out anything with capacitance.

Online med6753

  • Super Contributor
  • ***
  • Posts: 6891
  • Country: us
  • Tek nut
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #69774 on: September 18, 2020, 05:46:11 pm »
Replace the Schaeffner. Like, now.

Wait what ? can't see your message with all the smoke!

If his mains were 240V I agree, change it now. But it seems those filters rarely blow with mains of 120V which is what he has.

Who are you and what have you done with the grump-smurf?  The real med would NEVER recommend against "symphony-of-blunderbusses" style changing out anything with capacitance.

We all have a mellow side I guess.  ;D Notice I did NOT say you need to change it yesterday or risk airing out the house. With 120V you can do it whenever. Hell, both my 2465's still have their factory "whenevers" in them.  :=\ :-DD 
An old gray beard with an attitude.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf