Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 1831091 times)

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Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36075 on: August 02, 2019, 10:10:30 am »
Hei bd,

since you are having so much fun with your Heathkit VTVM
I thought, I'll show you some photos of one of my four (don't ask   ::) ) VTVM.   ;D

They are from Rohde & Schwarz, mostly made for the German Post
back in the 60's and 70's. They are called URU 1080BN and are
heavy and sturdy as hell. The case is made of 1mm steel.

The vacuum tube used in them is a E80CC (double triode)
and I have four NOS of them here. I'd bought them just before
the prices were going insane, bloody audiophooles.  |O  :palm:

I do have the original service manual as well,
see some pictures below. They were going through the effort
and did a schematic of every single operation mode.  :-+
I have added as an example the schematic for the "V-" operation mode.

So, let's start:

Front view:



detailed view of the front:



view from the top right to the vacuum tube:



nasty Selenium rectifier:



back side with the power transistor for the linear PSU, Germanium made:



detail view to the PSU on the other side:



left side overview:



left side, range selector switch:



bottom view with some nice resistors, e.g. the 89 MOhm one:



And here is the manual, front page (isn't it nice? These silver letters ...):  :-+



full schematic. I've uploaded the full resolution,
so it could take a little longer to download it. Same goes for the
other pictures of the schematic. These schematics were huge!  :o



schematic example, operation mode "V-", left part:



schematic example, operation mode "V-", middle part:



schematic example, operation mode "V-", right part:



some specs. This thing weighs 9kg!  :o
And you can overload every range by a factor of 100 with a max voltage up to 3000V
As bd139 said: "the tube goes only "meh" and carry on then."  :-DD



Enjoy!


Mounty

Edit: fixed stupidness caused by distraction  :palm:

Edit2: added some specs.
« Last Edit: August 02, 2019, 11:12:07 am by BU508A »
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 
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Offline Ice-Tea

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36076 on: August 02, 2019, 10:24:12 am »
Largest pièce of equipment I own right now. TEA worthy indeed!



Ah, in the other thread I asked what this Keithley beast was. First time I've seen one, but there's no mistaking the "brown era" enclosure design. Some kind of switching matrix for T&M automation?

Officially 'semiconductor switch matrix', yes ;)
eBay shop with all the gear you need!
FS: Agilent 54825A, R&S CMU200, CRTU, SMIQ06L, Marconi 6201B, Lecroy WP 950, 9354TM, 9354M, 9374L LC584A, Tek THS720P, TDS7154B, Anritsu MG3671A 2.75G I/Q RF gen, Keithley 238 SMU, HP 8642B, 8903A, 8110A, 8156A
 
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36077 on: August 02, 2019, 10:32:31 am »
@BU508A: thanks for posting that. Beautiful piece of equipment! I should probably look out for a commercial VTVM here instead. They are usually built by more competent people  :-DD . Marconi did some really nice ones that turn up here occasionally. Also they're weird because the meter is upside down.
 

Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36078 on: August 02, 2019, 10:39:00 am »
@BU508A: thanks for posting that. Beautiful piece of equipment! I should probably look out for a commercial VTVM here instead. They are usually built by more competent people  :-DD . Marconi did some really nice ones that turn up here occasionally. Also they're weird because the meter is upside down.

You're welcome.  :)

You mean, eventually those guys have built them?  ;D

“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Online PA0PBZ

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36079 on: August 02, 2019, 10:42:29 am »
Also they're weird because the meter is upside down.

For some reason Marconi did this a lot:

Keyboard error: Press F1 to continue.
 

Offline beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36080 on: August 02, 2019, 11:39:17 am »
Celebratory Port after not having a proper bench for a week or so. Still a WIP but the soddering can start again and yes I am a leftie.  ;)

Coffee, Food, R/C and electronics nerd in no particular order :)
 

Online xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36081 on: August 02, 2019, 11:47:46 am »
Got the FT-991 PA transistors pulled after a fair amount of heat and braid. New ones are ready in the bag.

Hopefully will achieve 100% customer satisfaction.  :popcorn:
« Last Edit: August 02, 2019, 11:50:10 am by xrunner »
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 
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Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36082 on: August 02, 2019, 12:35:00 pm »
............ and yes I am a leftie.  ;)



Me too....on most things but not 100% leftie.
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36083 on: August 02, 2019, 12:48:27 pm »
PM3217 arrived. Looks in pretty good condition  :-+. Not getting any time to look at it any time soon though due to work commitments :-- :--

Today:

 

Offline beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36084 on: August 02, 2019, 12:54:19 pm »
............ and yes I am a leftie.  ;)

Me too....on most things but not 100% leftie.

Both may be true from time to time ;) Must make and add them to my Cork Coaster collection.

Coffee, Food, R/C and electronics nerd in no particular order :)
 

Offline Kosmic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36085 on: August 02, 2019, 01:32:27 pm »
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36086 on: August 02, 2019, 01:39:23 pm »
Also they're weird because the meter is upside down.

For some reason Marconi did this a lot:


I think it was quite common on some cars back then so maybe that is the reason.

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Offline Kosmic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36087 on: August 02, 2019, 01:47:24 pm »
Celebratory Port after not having a proper bench for a week or so. Still a WIP but the soddering can start again and yes I am a leftie.  ;)

(Attachment Link)

Good job, look really clean  :-+
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36088 on: August 02, 2019, 02:04:45 pm »
Removed post until ebay case dealt with.
« Last Edit: August 02, 2019, 03:30:54 pm by bd139 »
 

Online jjoonathan

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36089 on: August 02, 2019, 02:19:50 pm »
A RIFA cap that isn't cracked, dark yellow, and swollen? What magic is this?

Probably a clone.

I wouldn't trust it to fill my lab with smoke. You might be able to use it in a line filter, though.
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36090 on: August 02, 2019, 02:33:12 pm »
The latest TEA related woodworking project is done and installed a day early. Pix 1 shows an under utilized space between the audio system and bench A. Pix 2 shows the solution. This was actually inspired by the lady cop. She sarcastically remarked one day “I'm surprised you don't kick out that plant and use that space”.  ::) Well my dear, your wish is my command.  :-+ Space now better utilized. Now I'm sure when she sees it I'm going to get a massive eye roll and a “you ain't right”. To which I am going to reply: “Well if you hadn't opened your mouth I probably wouldn't have thought of it”.  :P Now for my young friends, this is how you catch fleas because you will be in the dog house.  :palm: You never, EVER, call out a woman on something she said.  :scared: Not a healthy thing to do. But I'm too old and stupid to care. She'll get over it.  ;D

And for you plant lovers. Don't not fret. The plant is fine. Moved to another location which actually provides it with better sunshine.


An old gray beard with an attitude.
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36091 on: August 02, 2019, 02:41:38 pm »
I am liking that woodyness. Nice job  :-+

A RIFA cap that isn't cracked, dark yellow, and swollen? What magic is this?

Probably a clone.

I wouldn't trust it to fill my lab with smoke. You might be able to use it in a line filter, though.

Crusty evidence I found underneath that one suggests that one exploded already in it! They did a good job of cleaning it up though.
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36092 on: August 02, 2019, 02:52:06 pm »
Removed pictures until ebay sorted.
« Last Edit: August 02, 2019, 03:30:33 pm by bd139 »
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36093 on: August 02, 2019, 02:55:59 pm »
Really looks nice but aren't those blue Philips capacitors prone to magic smoke release or at least going leaky?  :-//
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36094 on: August 02, 2019, 02:56:57 pm »
Yeah they are ALL going believe me. Once I've done a full test on it, I will recap the entire thing end to end.
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36095 on: August 02, 2019, 02:57:46 pm »
A RIFA cap that isn't cracked, dark yellow, and swollen? What magic is this?

Probably a clone.

I wouldn't trust it to fill my lab with smoke. You might be able to use it in a line filter, though.
Could it be that it has already been replaced?

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Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36096 on: August 02, 2019, 03:03:06 pm »
@bd139 that looks a mighty fine example [emoji106]

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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36097 on: August 02, 2019, 03:18:17 pm »
Not all roses. The vertical channel A fine is locked to the main attenuator. Looks like there was a botched repair done. Someone has properly fucked it.
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36098 on: August 02, 2019, 03:22:34 pm »
Not all roses. The vertical channel A fine is locked to the main attenuator. Looks like there was a botched repair done. Someone has properly fucked it.

Those damn gorillas.  |O
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36099 on: August 02, 2019, 03:29:41 pm »
Yeah it's fubared. Returning it.  Gonna pull the images of it until that's sorted.
 


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