Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 1710435 times)

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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37150 on: August 19, 2019, 05:09:31 pm »
Right, OK, I'm back onto the Hacker Herald radio that I was attempting to replace all of the Ge transistors with Si and I was having problems with distortion on the modified amplifier, well it turns that bloody Murphy must have crept in my lab while I was snoozing , the bastard. I think I have found the source of the problem, but I'll let you know for certain later after dinner hopefully.

The problem that I think is causing it is that the transistors that should been in the preamp stage 2N3904's were not, but somehow I managed refit the BC148 which have 1.5 times the gain and in theory could well be the smoking gun here, over driving the output pair. I have now swapped them out and hopefully later this evening I'll be able to get around testing the theory out.

Could the problem be me all along, seems to be pointing that way  :palm: :palm:

I blame the cockmoon: oglaf.com/moonbeams <~~~~ WARNING: Location VERY NSFW!!!   

mnem
Yes, you may touch it.  >:D
« Last Edit: August 19, 2019, 05:21:51 pm by mnementh »
 

Online bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37151 on: August 19, 2019, 05:12:27 pm »
Sorry Pat, as I couldn't find much of interest in the UK I was searching on ePay.com for digital counters & voltmeters and that is how I found the Dana, I'm looking forward to the teardown too.

I did end up buying this reversible counter though.   ;D

(Attachment Link)

David

Whoops!! I'm afraid I wound up costing you about $25, then - I took a crack at that one, too, as I'd never seen that model listed before.  That's the danger of a bunch of us having similar interests.  Sorry!  I'd been watching it for months (he previously had it listed at $199 for a loooooong time).  I'd like to see the inside of it when it gets to you, and it's nice to know it will be going to a good home.

-Pat

It's OK an extra $25 is very little compared with the international shipping & import fees, it looked unusual enough & as I didn't have a HP reversible counter in my collection I decided to bid for it, it also seems to be the third HP item I have that I can't find in any of the catalogues.

Anyway I collected the HP K20-5280A counter from the local ParcelFarce depot & paid my fees last Friday, the seller did an excellent job of packing it in a large box with plenty of foam chips & bubble wrap all round :-+ , if only others would do the same.

Neat. Added to POI.

I've seen some other HP gear that had that model naming convention (i.e., the hyphenated prefix). Anyone know what the story is on it? Was it a format used by a company that HP acquired?
I TEA.
 
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Online bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37152 on: August 19, 2019, 05:24:10 pm »
Those images look great. I checked out some videos, too. Very clear, unlike the scopes from just a few years earlier. The ADSM302 is this year's model with twice the working distance (up to 22cm), but the 301 seems just fine (up to 12 cm), considering the lower cost, the same resolution, and the same frame rate.

Help me! It looks like I'm getting one, now. Order submitted. :scared:

I can't help you now it's too late.  :-DD

Yeah, I had that reply open as I was perusing. So, you can read that "help" line as the three steps of my shopping log. :-DD

Quote
The base is solid aluminum but it's not great for laying a board on because it's too slippery-slidey. Just need to put on a material to help a board stay put. Looking at some options like a piece of ESD mat.

Yep, ESD mat, mouse pad, jar opener

Quote
I did some soldering with it yesterday and was very pleased with how it went.

Took another pic for you at full magnification.

That looks perfect for hunting down subtly fractured solder joints.
I TEA.
 

Offline factory

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37153 on: August 19, 2019, 06:08:08 pm »
Sorry Pat, as I couldn't find much of interest in the UK I was searching on ePay.com for digital counters & voltmeters and that is how I found the Dana, I'm looking forward to the teardown too.

I did end up buying this reversible counter though.   ;D

(Attachment Link)

David

Whoops!! I'm afraid I wound up costing you about $25, then - I took a crack at that one, too, as I'd never seen that model listed before.  That's the danger of a bunch of us having similar interests.  Sorry!  I'd been watching it for months (he previously had it listed at $199 for a loooooong time).  I'd like to see the inside of it when it gets to you, and it's nice to know it will be going to a good home.

-Pat

It's OK an extra $25 is very little compared with the international shipping & import fees, it looked unusual enough & as I didn't have a HP reversible counter in my collection I decided to bid for it, it also seems to be the third HP item I have that I can't find in any of the catalogues.

Anyway I collected the HP K20-5280A counter from the local ParcelFarce depot & paid my fees last Friday, the seller did an excellent job of packing it in a large box with plenty of foam chips & bubble wrap all round :-+ , if only others would do the same.

Neat. Added to POI.

I've seen some other HP gear that had that model naming convention (i.e., the hyphenated prefix). Anyone know what the story is on it? Was it a format used by a company that HP acquired?

I haven't a clue, it gets very confusing with some of the model number prefixes, for example;

K02-738BR package of TE sold together (200SR, 738BR & 739AR in cabinet).
But then there is a later version E02-738BR with 652A & 738BR.  :-//

Some options are given as a prefix, e.g. H20-1405A which is a double height XY version of the standard 1405A scope amplifier plug-in.
There are similar prefixes for line frequency options, MIL spec line filters, etc.... :blah:

And then there is the stuff that isn't in the catalog like the K20-5280A  :-// and in-house only kit such as the K79-0981C diode test set, in-house prefixes seemed to change to ET-xxxx later on too.

I think we need someone with inside knowledge to answer this properly.

David
« Last Edit: August 19, 2019, 06:10:09 pm by factory »
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37154 on: August 19, 2019, 07:51:23 pm »
Busy day today. Absolutely bugger all TE related though. Decided to make amends. Did some research and may join the BVWS here in the UK. They seem to do auctions populated by cheap bastards who don’t want to pay anything for stuff  :-DD ... lots of TE appears in it.
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37155 on: August 19, 2019, 08:04:30 pm »
Are you sure about that, their website has not been updated in the last 4 years apart from the announcement of their next event, an a swap meet on the 4th August  :wtf:
Who let Murphy in?
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37156 on: August 19, 2019, 08:08:32 pm »
Yeah 100%. They posted auction catalogues and results as well. Lots of interesting stuff.

There’s an auction in Harpenden which isn’t terrible for me to get to as well. And you can join there after you’ve had a look at the auction catalogue!
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37157 on: August 19, 2019, 08:08:53 pm »
Quick update on the Hacker amp, nope, the distortion is still there and had to call a halt on it for the evening as the tone from the speaker is driving everyone nuts in the house, even on low volume  :-DD 
Who let Murphy in?
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37158 on: August 19, 2019, 08:09:58 pm »
Yeah 100%. They posted auction catalogues and results as well. Lots of interesting stuff.

There’s an auction in Harpenden which isn’t terrible for me to get to as well. And you can join there after you’ve had a look at the auction catalogue!
I'll have to have another look at that then  |O

I must have missed that then, membership is £32 for year.
Who let Murphy in?
 

Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37159 on: August 19, 2019, 08:21:37 pm »
Busy day today. Absolutely bugger all TE related though. Decided to make amends. Did some research and may join the BVWS here in the UK. They seem to do auctions populated by cheap bastards who don’t want to pay anything for stuff  :-DD ... lots of TE appears in it.

Hmmmm, lots of grey-haired folks there (if they did not loss their hair), sure, you wanna join them bd?  :-DD

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

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37160 on: August 19, 2019, 08:23:42 pm »
I'll have to have another look at that then  |O

I must have missed that then, membership is £32 for year.

Yep - you have to be a member to bid in an auction but you don't have to pay to go and have a look however.

Hmmmm, lots of grey-haired folks there (if they did not loss their hair), sure, you wanna join them bd?  :-DD

*looks in mirror* ... I'll fit right in!  :-DD
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37161 on: August 19, 2019, 08:31:08 pm »
Some final prices:

Tek 475 - £10
Farnell LT30-2 - £20
HP 6516A 3KV supply - £32
Marconi VTVM - £10
Telequipment D54- £5
Heathkit DX-100U - £120 (worth it!)
Tek 2236 - £80


Test gear appears to go for SFA as it's not the primary interest of participants.
 

Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37162 on: August 19, 2019, 08:33:30 pm »
Oh, they had in July this nice Grundig Satellite short wave receiver. Very nice these, wanted always one.
Do you know how much this one has been sold?

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

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37163 on: August 19, 2019, 08:34:38 pm »
https://www.bvws.org.uk/auctions/results.php/2019-07-07-royal-wootton-bassett

went for £60

Edit: whoa they had a Tek 549 go for £60 as well in working condition.
« Last Edit: August 19, 2019, 08:36:50 pm by bd139 »
 
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Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37164 on: August 19, 2019, 08:38:25 pm »
Busy day today. Absolutely bugger all TE related though. Decided to make amends. Did some research and may join the BVWS here in the UK. They seem to do auctions populated by cheap bastards who don’t want to pay anything for stuff  :-DD ... lots of TE appears in it.

Hmmmm, lots of grey-haired folks there (if they did not loss their hair), sure, you wanna join them bd?  :-DD



Damn, wish they had something like that here.  :-+

Grey hair? I'd also fit right it.  :-DD
An old gray beard with an attitude.
 
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37165 on: August 19, 2019, 08:57:11 pm »
...I can't help you now it's too late.  :-DD

The base is solid aluminum but it's not great for laying a board on because it's too slippery-slidey. Just need to put on a material to help a board stay put. Looking at some options like a piece of ESD mat.

Look for small silicone bench mats, the kind used for cellphone repair. They'll have little wells for small components, or you can just flip them upside down.

mnem
*back out into hell*
 
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Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37166 on: August 19, 2019, 09:04:14 pm »
Since here are some folks which are interested in valves, tubes, vacuum tubes or electron tubes, perhaps this may be of some interest.

There is a guy in Germany, Helmut Weigl, he developed a digitally tube tester, the so-called RoeTest.
If you are looking for a nice project, this could be one for a tube enthusiast.
I have no affiliation to him besides I'm finding this a very interesting project.
I have considered to build one by myself.

This is his website:
http://www.roehrentest.de/EnglishInfo.html

Here are some pictures of people, which have build one:

Overview list: http://www.roehrentest.de/AndereRoetests.html

Example from Stephan Kissling (http://www.roehrentest.de/NB%20Kissling%20Stephan.html):



Example from Kralj Marko for a 19" case (http://www.roehrentest.de/NB%20Kralj%20Marko.html):



This is a very impressive one, made from massive Aluminium with! water cooling by Spence Barton (http://www.roehrentest.de/NB%20Spence%20Barton.html):




Really, we are not the only crazy TEA folks here on earth.  :-+  :D
“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 bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37167 on: August 19, 2019, 09:06:43 pm »
Damn that's a beast. Last tube tester I used was in the local radio shop in about 1985 and it was one of those plug in go/no go ones and it was already 10 years obsolete. The guy who ran it was surprised that anyone wanted to use it and had to untangle the plug  :-DD
 

Offline factory

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37168 on: August 19, 2019, 09:13:08 pm »
Busy day today. Absolutely bugger all TE related though. Decided to make amends. Did some research and may join the BVWS here in the UK. They seem to do auctions populated by cheap bastards who don’t want to pay anything for stuff  :-DD ... lots of TE appears in it.

Be aware there are people already doing exactly that, I'm sure I have something here with a Harpenden lot # sticker still attached that came off ePay.
Plus I've looked through the website catalogue pictures in the past too and then seen something that looks very familiar on ePay, the lazy seller just tried to cover up the stickers using a marker pen & added a few zeros to the price, it appeared week after week because of the silly price.  :-DD

David
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37169 on: August 19, 2019, 09:30:45 pm »
I'll have to have another look at that then  |O

I must have missed that then, membership is £32 for year.

Yep - you have to be a member to bid in an auction but you don't have to pay to go and have a look however.

Hmmmm, lots of grey-haired folks there (if they did not loss their hair), sure, you wanna join them bd?  :-DD

*looks in mirror* ... I'll fit right in!  :-DD
That makes 2 of us then  :-DD :-DD :-DD
Who let Murphy in?
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37170 on: August 19, 2019, 09:33:51 pm »
Some final prices:

Tek 475 - £10
Farnell LT30-2 - £20
HP 6516A 3KV supply - £32
Marconi VTVM - £10
Telequipment D54- £5
Heathkit DX-100U - £120 (worth it!)
Tek 2236 - £80


Test gear appears to go for SFA as it's not the primary interest of participants.
Yep, you're right again, some of those prices are good but don't forget you have to factor in the membership and fuel / parking but grab enough bits and it should be worth it  :-+

Somebody does need to keep their site a bit more relevant though. I found the upcoming events and the completed listing but there is also another tab / link that takes you straight to a upcoming event on 6th August, now where did I park my time machine  :-DD
« Last Edit: August 19, 2019, 09:36:24 pm by Specmaster »
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37171 on: August 19, 2019, 09:36:55 pm »
Busy day today. Absolutely bugger all TE related though. Decided to make amends. Did some research and may join the BVWS here in the UK. They seem to do auctions populated by cheap bastards who don’t want to pay anything for stuff  :-DD ... lots of TE appears in it.

Be aware there are people already doing exactly that, I'm sure I have something here with a Harpenden lot # sticker still attached that came off ePay.
Plus I've looked through the website catalogue pictures in the past too and then seen something that looks very familiar on ePay, the lazy seller just tried to cover up the stickers using a marker pen & added a few zeros to the price, it appeared week after week because of the silly price.  :-DD

David

Yeah that doesn’t surprise me. I’d probably value add i.e. fix and test it before shifting. Got an eBay reputation to keep  :-DD

Yep, you're right again, some of those prices are good but don't forget you have to factor in the membership and fuel / parking but grab enough bits and it should be worth it  :-+

Indeed. It’s a gamble but what isn’t.  :-+
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37172 on: August 19, 2019, 09:39:05 pm »
Oh, they had in July this nice Grundig Satellite short wave receiver. Very nice these, wanted always one.
Do you know how much this one has been sold?


Watching the video it seems that the real old radios go for a small fortune by comparison.
Who let Murphy in?
 

Offline factory

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37173 on: August 19, 2019, 09:43:24 pm »
Busy day today. Absolutely bugger all TE related though. Decided to make amends. Did some research and may join the BVWS here in the UK. They seem to do auctions populated by cheap bastards who don’t want to pay anything for stuff  :-DD ... lots of TE appears in it.

Be aware there are people already doing exactly that, I'm sure I have something here with a Harpenden lot # sticker still attached that came off ePay.
Plus I've looked through the website catalogue pictures in the past too and then seen something that looks very familiar on ePay, the lazy seller just tried to cover up the stickers using a marker pen & added a few zeros to the price, it appeared week after week because of the silly price.  :-DD

David

Yeah that doesn’t surprise me. I’d probably value add i.e. fix and test it before shifting. Got an eBay reputation to keep  :-DD

 :-+

It also surprises me that people list TE for £hundreds on ePay and can't even be bothered to give it a quick clean.  :--

David

P.S. I finally decided I needed an a working digital capacitor meter that will measure more than 20uF, so I put in a £40 offer on a Peak ESR70 last night and it got accepted.  :)
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37174 on: August 19, 2019, 09:50:28 pm »
Busy day today. Absolutely bugger all TE related though. Decided to make amends. Did some research and may join the BVWS here in the UK. They seem to do auctions populated by cheap bastards who don’t want to pay anything for stuff  :-DD ... lots of TE appears in it.

Be aware there are people already doing exactly that, I'm sure I have something here with a Harpenden lot # sticker still attached that came off ePay.
Plus I've looked through the website catalogue pictures in the past too and then seen something that looks very familiar on ePay, the lazy seller just tried to cover up the stickers using a marker pen & added a few zeros to the price, it appeared week after week because of the silly price.  :-DD

David

Yeah that doesn’t surprise me. I’d probably value add i.e. fix and test it before shifting. Got an eBay reputation to keep  :-DD

 :-+

It also surprises me that people list TE for £hundreds on ePay and can't even be bothered to give it a quick clean.  :--

David

P.S. I finally decided I needed an a working digital capacitor meter that will measure more than 20uF, so I put in a £40 offer on a Peak ESR70 last night and it got accepted.  :)
That's a really good deal, RS selling that one for £118.64, well done.  :-+ Plus it goes all the way to 22000uF, but be sure to discharge the caps each time as I've heard they do not like charged caps and can get zapped with ease.
« Last Edit: August 19, 2019, 09:52:48 pm by Specmaster »
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