Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise


It is currently Mar Mon 25, 2019 4:40 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 38 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Restoration of HP141s/8553L/8552A
PostPosted: Jan Tue 15, 2019 7:17 pm 
Member

Joined: Nov Wed 15, 2006 7:56 am
Posts: 1281
Location: germany
today the HP arrived here.

First inspection: the tuning knob in the 8553L is fixed, not possible to turn that.

Attachment:
141s-1a.jpg
141s-1a.jpg [ 145.53 KiB | Viewed 783 times ]


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Wed 16, 2019 4:04 am 
Member
User avatar

Joined: Oct Sun 15, 2006 12:57 pm
Posts: 6191
Location: Liberty, Missouri
Hello Martin,

Congratulations, It arrived without damage. Looks very nice. You'll be impressed when you have it running properly, they are still impressive machines. SLOW at narrow bandwidths, but impressive nonetheless.

You do have the maintenance manuals, don't you?

Are you looking for the other RF modules?

_________________
Pics, Bold & underlined text, are usually links.

https://mikeharrison.smugmug.com/

Mike


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Wed 16, 2019 9:04 am 
Member

Joined: Nov Wed 15, 2006 7:56 am
Posts: 1281
Location: germany
hello Mike,
there was no Manuals and no Powercable (but I am happy to have that cable in stock)
Yes, I am looking for some plugins to make it more useful.
btw it looks not so heavy then it is :mrgreen: around 30kg
greetings
Martin


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Wed 16, 2019 2:51 pm 
Member

Joined: Jan Mon 28, 2013 9:35 pm
Posts: 1318
Location: Santa Rosa, CA
Congrats Martin! I was at HP when these were in production.
Sold boat loads of them. Excellent SA's.

The stuck knob issue is very common with these. The shaft
going through the bushing in the panel binds. It takes patience
and some penetrating oil (I use auto tranny fluid) to get
it turning. If you can get that shaft to move even a little,
keep working it back and forth while applying oil. Some
have reported heating the shaft helps too.

There are a couple of fuses buried inside the plug ins.
If these blow take a look at the regulators. If one is bad it'll
take out the other.
Steve

_________________
'cell phones and the internet are tools, not a lifestyle'


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Thu 17, 2019 1:17 am 
Member
User avatar

Joined: Mar Wed 11, 2015 1:46 am
Posts: 1192
Location: Boiling Springs, PA
I dont have the schematic for the 141S but I have been meaning to do this modification to my 141T that blows fuses. Im glad I printed it from the internet because the link is no good today.


Attachments:
scan0007.jpg
scan0007.jpg [ 77.12 KiB | Viewed 687 times ]

_________________
Jeff-W3JKO

"Things are more like they are now than they ever were before" -D. Eisenhower
Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Thu 17, 2019 9:16 am 
Member

Joined: Nov Wed 15, 2006 7:56 am
Posts: 1281
Location: germany
zarco wrote:
he stuck knob issue is very common with these. The shaft
going through the bushing in the panel binds. It takes patience
and some penetrating oil (I use auto tranny fluid) to get
it turning. If you can get that shaft to move even a little,
keep working it back and forth while applying oil. Some
have reported heating the shaft helps too.


thank you
exactly this was helpful, its now free.

greetings
Martin


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Thu 17, 2019 8:32 pm 
Member

Joined: Nov Wed 15, 2006 7:56 am
Posts: 1281
Location: germany
:mrgreen:

Attachment:
141-17a.jpg
141-17a.jpg [ 224.82 KiB | Viewed 647 times ]


Attachment:
141-2a.jpg
141-2a.jpg [ 209.42 KiB | Viewed 647 times ]


Attachment:
141-4a.jpg
141-4a.jpg [ 172.12 KiB | Viewed 647 times ]


Attachment:
141-13a.jpg
141-13a.jpg [ 250.29 KiB | Viewed 647 times ]


Attachment:
141-11a.jpg
141-11a.jpg [ 142.18 KiB | Viewed 647 times ]


Attachment:
141-14a.jpg
141-14a.jpg [ 142.51 KiB | Viewed 647 times ]


Attachments:
141-15a.jpg
141-15a.jpg [ 186.27 KiB | Viewed 647 times ]
Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Fri 18, 2019 9:02 am 
Member

Joined: Nov Wed 15, 2006 7:56 am
Posts: 1281
Location: germany
the AC input filterbox with the plug is shortet between pin 1+3


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Fri 18, 2019 12:43 pm 
Member
User avatar

Joined: Oct Sun 15, 2006 12:57 pm
Posts: 6191
Location: Liberty, Missouri
If you bypass the power input filter, does the unit operate?

_________________
Pics, Bold & underlined text, are usually links.

https://mikeharrison.smugmug.com/

Mike


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Fri 18, 2019 4:11 pm 
Member

Joined: Jan Mon 28, 2013 9:35 pm
Posts: 1318
Location: Santa Rosa, CA
MM wrote:
the AC input filterbox with the plug is shortet between pin 1+3


If its the type with the sliding plastc window check the 'safety' cap.
I've had three of these fail and usually accompanied by smoke
and flames. These are wired in *before* the fuse.

Nice collection of vintage Tek scopes BTW! Wish I had kept my
545B but space wouldn't allow it.
Steve

_________________
'cell phones and the internet are tools, not a lifestyle'


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Fri 18, 2019 10:23 pm 
Member

Joined: Nov Wed 15, 2006 7:56 am
Posts: 1281
Location: germany
This Sprague filter box is not to open, I have removed that and insert another plug and a good filter can.

it wakes up :wink:

Attachment:
141-19a.jpg
141-19a.jpg [ 174.1 KiB | Viewed 587 times ]


greetings
Martin


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Fri 18, 2019 10:53 pm 
Member
User avatar

Joined: Oct Sun 15, 2006 12:57 pm
Posts: 6191
Location: Liberty, Missouri
KOOL!!

Congratulations, its nice to see it working.

_________________
Pics, Bold & underlined text, are usually links.

https://mikeharrison.smugmug.com/

Mike


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Mon 21, 2019 12:46 pm 
Member

Joined: Nov Wed 15, 2006 7:56 am
Posts: 1281
Location: germany
The nuvistor in the 141s HV, (HP numbered) is a 7586 or another?

Calibration.

vertical was no problem it goes exactly.
Horizontal:

When I adjust it so that ranges -from - to , are accurate, and I switch him to do the full sweep from zero to 110MHz, it will nott pass the last 5MHz bc. there is the end of the beam. This may be typical when using 141"s" and the "T" do that better?

--

I`m on the way to buy the 300kHz Plugin also. This unit have a tracker .

greetings
Martin


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Mon 21, 2019 1:25 pm 
Member

Joined: Nov Wed 30, 2016 7:35 pm
Posts: 3487
Location: Sunbury, Ohio 43074
MM, how do you keep that room cool with that very impressive collection of TEK scopes?? lol. Hope you have a cheap source of power out there!

_________________
Preserving the history of electronics, one boat anchor at a time! :)
www.bbtvtestequipment.com


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Mon 21, 2019 4:36 pm 
Member
User avatar

Joined: Oct Sun 15, 2006 12:57 pm
Posts: 6191
Location: Liberty, Missouri
Barry, I don't think the heat is the problem, its the weight. I'd venture to guess he has TONS of gear there, and the scary part is looks as if it's in the attic. :roll:

_________________
Pics, Bold & underlined text, are usually links.

https://mikeharrison.smugmug.com/

Mike


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Mon 21, 2019 4:48 pm 
Member
User avatar

Joined: Dec Sun 21, 2014 6:37 am
Posts: 1815
Location: Portland, TN, USA
Mikeinkcmo wrote:
Barry, I don't think the heat is the problem, its the weight. I'd venture to guess he has TONS of gear there, and the scary part is looks as if it's in the attic. :roll:

That’s exactly what went through my mind as I looked at some of Martin's photos this morning!

I’ve seen many other pictures of his collection and know this isn’t even the tip of the iceberg.

On a related note, I have sometimes feared for your basement floor, Mike. :D

_________________
73, de Chuck K4CCW

"The question is not what you look at, but what you see." Thoreau


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Mon 21, 2019 5:10 pm 
Moderator
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 22659
Location: Somers, CT
I like that display on the S more than the storage scope version. Much sharper. Nice setup.

Pete

_________________
Just because it can be done doesn't mean it should be done.


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Mon 21, 2019 5:24 pm 
Member

Joined: Nov Wed 15, 2006 7:56 am
Posts: 1281
Location: germany
the s is also a storage :wink:

about 8556: they ask for 200€ I think that is too much for a analog plugin

The 141s found a place on top of the radio bench :)

Attachment:
08.jpg
08.jpg [ 250.01 KiB | Viewed 489 times ]


greetings
Martin


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Tue 29, 2019 9:06 am 
Member

Joined: Nov Wed 15, 2006 7:56 am
Posts: 1281
Location: germany
the next step:

I found in NL a HP 8556A plugin 50+postage, it`s on the way 8)

about the 1A fuses in back from 8552: is 1A to small there? was blown 2 times


Top
 Profile  
 
 Post subject: Re: Restoration of HP141s/8553L/8552A
PostPosted: Jan Tue 29, 2019 1:08 pm 
Member
User avatar

Joined: Oct Sun 15, 2006 12:57 pm
Posts: 6191
Location: Liberty, Missouri
Congratulations on your "new" Plut-in!!! It will give you a whole new spectrum to play with. :wink:

As for THE FUSE problem, I had that problem and some how "fixed" it, but I'm sure there are better solutions. I have forgotten the exact problem with that power supply circuit, but if you study the circuit around that fuse I'm sure you'll find the problem. As I remember it was something to do with the initial power up "turn on" conditions in the circuit.

I may have taken some notes, I'll look and see if I have them, and will let you know if I find anything.

_________________
Pics, Bold & underlined text, are usually links.

https://mikeharrison.smugmug.com/

Mike


Top
 Profile  
 
Post New Topic Post Reply  [ 38 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: Koby, mbruvry, TechyMechy and 11 guests



Search for:
Jump to:  


























Privacy Policy :: Powered by phpBB