UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Test Gear and Workshop Equipment

Notices

Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

Reply
 
Thread Tools
Old 2nd Aug 2022, 9:14 pm   #1
Roland Huisman
Tetrode
 
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
Smile Mullard E7600/4 tube tester card database

Hello! I could not resist buying this old Mullard E7600/4.
I think the tester is a restoration project, DG7-5 is missing... So what more?
This week the tester will come here together with a box of cards.

I wonder, a friend of mine has a Mullard CT80, are the cards the same?

And is there some sort of database with these cards already? There are
probably some newer tubes which I would like to test on it as well...

Regards, Roland
Attached Thumbnails
Click image for larger version

Name:	Mullard E7600-4 tester 02.jpg
Views:	92
Size:	95.9 KB
ID:	262016   Click image for larger version

Name:	Mullard E7600-4 tester 04.jpg
Views:	88
Size:	99.9 KB
ID:	262017   Click image for larger version

Name:	Mullard E7600-4 tester 12.jpg
Views:	75
Size:	100.5 KB
ID:	262018   Click image for larger version

Name:	Mullard E7600-4 tester 10.jpg
Views:	76
Size:	131.1 KB
ID:	262019  
Roland Huisman is offline   Reply With Quote
Old 2nd Aug 2022, 9:18 pm   #2
Cobaltblue
Moderator
 
Cobaltblue's Avatar
 
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 5,948
Default Re: Mullard E7600/4 tube tester card database

Hi Roland

This thread may be of interest.

https://www.vintage-radio.net/forum/...ead.php?t=6112

Cheers

Mike T
__________________
Don't care if it was a bargain why's it in my kitchen
Mike T BVWS member.
www.cossor.co.uk
Cobaltblue is online now   Reply With Quote
Old 3rd Aug 2022, 10:11 am   #3
Roland Huisman
Tetrode
 
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
Default Re: Mullard E7600/4 tube tester card database

Thanks, I found that one but initially I found a lot of dead links. But in the later pages there are very useful links. So I will go from there, very curious... So thanks for pointing me there. I will update this topic if anyone thinks it is interesting to see my tester being restored. Maybe I have some questions too. We will see.

Thanks, Roland
Roland Huisman is offline   Reply With Quote
Old 3rd Aug 2022, 4:31 pm   #4
Roland Huisman
Tetrode
 
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
Default Re: Mullard E7600/4 tube tester card database

I also found this tool on this website. But it seems to be very old and java script is not supported any more I think... Any new versions from this tool? I can't reply in that topic any more...

https://www.vintage-radio.net/forum/...9&postcount=13
Roland Huisman is offline   Reply With Quote
Old 3rd Aug 2022, 4:40 pm   #5
GMB
Nonode
 
GMB's Avatar
 
Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 2,824
Default Re: Mullard E7600/4 tube tester card database

Quote:
Mullard CT80, are the cards the same?
YES - all that is different is the annotation on the cards.

Avoid the (escaped) javascript tool as it contains erroneous data.

If you need specific cards I can probably provide the details for making it.
One day I hope to finish and verify the whiole database that I have collected so far.
GMB is offline   Reply With Quote
Old 3rd Aug 2022, 4:52 pm   #6
Roland Huisman
Tetrode
 
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
Default Re: Mullard E7600/4 tube tester card database

Well I got it running under IE with some warnings. But thanks for letting me know about possible errors. So I should not use that tool? At the moment I'm not really searching for specific cards. I need to restore the tester first.

The tester arrived today! Needs some TLC as usual with this old stuff... Most components and tubes are dated in 1966, and some capacitors even 1969. So I think this is a late tester...

The only parts that I'm missing is the CRT and its holder... I hope to find some sort of old oscilloscope, or does someone have such a CRT holder for sale?

Quote:
Originally Posted by GMB View Post
One day I hope to finish and verify the whiole database that I have collected so far.
Well I was hoping to find a document with all cards in it. I have about 1000 cards with this machine. So I have to check if I have cards that are still missing in your database... Any up to date list about that?

Regards, Roland
Attached Thumbnails
Click image for larger version

Name:	kaart 30 in IE.jpg
Views:	71
Size:	107.3 KB
ID:	262078   Click image for larger version

Name:	Lege plek.jpg
Views:	75
Size:	64.1 KB
ID:	262079   Click image for larger version

Name:	bottom.jpg
Views:	79
Size:	135.0 KB
ID:	262080   Click image for larger version

Name:	side 1.jpg
Views:	71
Size:	113.4 KB
ID:	262081   Click image for larger version

Name:	side 2.jpg
Views:	64
Size:	109.5 KB
ID:	262082  

Roland Huisman is offline   Reply With Quote
Old 3rd Aug 2022, 6:34 pm   #7
Electronpusher0
Octode
 
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
Posts: 1,963
Default Re: Mullard E7600/4 tube tester card database

I have a spare CRT, I'm pretty sure I also have the housing, you can have foc (just the cost of postage).
I converted mine to use a bargraph display.

https://www.vintage-radio.net/forum/...d.php?t=172215

PM me with your address.

Peter
Electronpusher0 is offline   Reply With Quote
Old 3rd Aug 2022, 7:10 pm   #8
Ed_Dinning
Dekatron
 
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 7,539
Default Re: Mullard E7600/4 tube tester card database

Hi Roland, looks like a good find and quite clean.
I gave mine a good service a year or so ago and it is performing much better now as many of the components were out of spec.
I may have a spare tube for the tester, but no mountings I'm afraid, so call me if you have no success in getting one elsewhere.
I can probably deliver the tube if needed as I will be travelling to Austria via Europort in early Sept

I have a good collection of cards but also made up the card punch described in the thread to make cards that I do not have. The various adapters detailed in the instructions are also worth making up.
It is also worthwhile fitting a bank of fuses on all the HT outputs from the transformer as it is quite special and I would not want to attempt to rewind it

Cheers, Ed
Ed_Dinning is online now   Reply With Quote
Old 3rd Aug 2022, 8:07 pm   #9
GMB
Nonode
 
GMB's Avatar
 
Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 2,824
Default Re: Mullard E7600/4 tube tester card database

Quote:
Any up to date list about that?
My web site is up to date. http://air-ministry.uk/mullard.htm
Although I have received quite a few contributions since the fairly old dates you will see there, nothing new has actually turned up. It is hard to know what the most up to date versions are for the various cards and a few cards remain to be found.
GMB is offline   Reply With Quote
Old 4th Aug 2022, 11:12 am   #10
Maarten
Dekatron
 
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 3,646
Default Re: Mullard E7600/4 tube tester card database

@Electronpusher0: your display looks really good, as if Mullard had intended to use such a display all along.

You write about the EL37 being obsolete by 1954, but strangely Roland's tester which seems to be a very late production one, is actually fitted with an EL37, though there's no small print on it so it might have been imported/rebranded. Date codes on other valves range from 1964-1966, capacitors 1966-1969. They don't look as if they've been replaced.
Maarten is offline   Reply With Quote
Old 4th Aug 2022, 5:37 pm   #11
Roland Huisman
Tetrode
 
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
Default Re: Mullard E7600/4 tube tester card database

@ Peter, Great! Already sent you a PM.

@ Ed, Peter has probably a tube and probably its housing too. Good idea to add some fuses to the tester. I wonder if I need some of these adapters. I have some magnoval tubes. I have just two compactron tubes known to be good. These are quite nasty to test on a tester like this I think.

@ GMB, you have a nice site. You said that the javascript tool is not 100% sure to be right? Is there a complete database for the cards available? I have seen some cards, but it would be great to have all the card information available.

I've checked your missing cards, but I don't have them either...

@ Maarten, yes I've sent you many pictures trough whatsapp while inspecting the tester. Really surprising to see that the components are dated in the late sixties...


A few other questions... What kind of mains plug do I need for this tester? I've never seen this. Looks like some sort of Bulgin plug. (on this site plug 1 and 2)

And is there a horizontal PDF scan/document like the original manual which is in the back of the tester? Mine is gone... And does anyone have a reference for the transparent plastic with the lines in front of the CRT. That is also missing...

See pictures which I got from this youtube video...

Regards, Roland
Attached Thumbnails
Click image for larger version

Name:	mains plug.jpg
Views:	39
Size:	46.9 KB
ID:	262185   Click image for larger version

Name:	plastic lines.jpg
Views:	43
Size:	48.7 KB
ID:	262186   Click image for larger version

Name:	manual.jpg
Views:	39
Size:	63.4 KB
ID:	262187  

Last edited by Roland Huisman; 4th Aug 2022 at 5:48 pm.
Roland Huisman is offline   Reply With Quote
Old 4th Aug 2022, 6:18 pm   #12
Electronpusher0
Octode
 
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
Posts: 1,963
Default Re: Mullard E7600/4 tube tester card database

re the crt scale, I don't know if this is any help, also a picture of mine before I changed the display.

Peter
Attached Thumbnails
Click image for larger version

Name:	Indicator Scale.jpg
Views:	42
Size:	31.3 KB
ID:	262194   Click image for larger version

Name:	IMG_1372.jpg
Views:	50
Size:	33.3 KB
ID:	262195  

Last edited by Electronpusher0; 4th Aug 2022 at 6:25 pm.
Electronpusher0 is offline   Reply With Quote
Old 4th Aug 2022, 9:10 pm   #13
Roland Huisman
Tetrode
 
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
Default Re: Mullard E7600/4 tube tester card database

Hi Peter, thanks! I will see if I can make something like that.

In addition to my previous questions, does anyone have a close-up from the transformer connections? The big transformer has one loose wire and some solder joints seem to be soldered on.

It would be nice if I can compare it with another tester.

Regards, Roland
Attached Thumbnails
Click image for larger version

Name:	transformator.jpg
Views:	58
Size:	81.4 KB
ID:	262220  
Roland Huisman is offline   Reply With Quote
Old 11th Aug 2022, 11:32 am   #14
Roland Huisman
Tetrode
 
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
Default Re: Mullard E7600/4 tube tester card database

In the meanwhile I found a mains plug through a Dutch forum

I've replaced the four 16uF electrolytic caps and the wax capacitor. Resistor values seem to be quite good. Only the carbon composite resistors are a bit out of range which we can expect nowadays...

Checked the tubes as well. They are testing fine, but one EF91 is a bit worn. Maybe I have a spare from my Bush TV22F project...

Regards, Roland
Attached Thumbnails
Click image for larger version

Name:	Bulgin.jpg
Views:	22
Size:	86.8 KB
ID:	262590  
Roland Huisman is offline   Reply With Quote
Old 11th Aug 2022, 11:41 am   #15
TowerRadio
Hexode
 
Join Date: Mar 2008
Location: Bristol, UK.
Posts: 331
Default Re: Mullard E7600/4 tube tester card database

I had to replace the 4.00 mfd 500v electrolytics for the eht to the crt,I used film ones,4.7mfd. 630v. The focus was useless,after changing electrolytics it was fine.Les
TowerRadio is online now   Reply With Quote
Old 11th Aug 2022, 5:51 pm   #16
stevehertz
Dekatron
 
stevehertz's Avatar
 
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
Posts: 6,981
Default Re: Mullard E7600/4 tube tester card database

Back in the 70s, at Harpendon I got to know a chap called Don Hewlett who worked at Mullard servicing the valve testers. I think he headed up the department. He was a minefield of information on them, a gent and a great help to me. One thing he told me was to set up the pass and fail limits differently to how the manual says. I can't recall the procedure offhand, but I'll dig it out and post here. Just for now though, he told me this quick way to ID a tester by the shape of the carrying handles. You may notice there's no mk2. Don said there wasn't one.
Attached Thumbnails
Click image for larger version

Name:	Mullardvalvetesterhandles.jpg
Views:	51
Size:	41.7 KB
ID:	262611  
__________________
A digital radio is the latest thing, but a vintage wireless is forever..
stevehertz is offline   Reply With Quote
Old 11th Aug 2022, 5:55 pm   #17
stevehertz
Dekatron
 
stevehertz's Avatar
 
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
Posts: 6,981
Default Re: Mullard E7600/4 tube tester card database

Quote:
Originally Posted by TowerRadio View Post
I had to replace the 4.00 mfd 500v electrolytics for the eht to the crt,I used film ones,4.7mfd. 630v. The focus was useless,after changing electrolytics it was fine.Les
I was getting a comet shaped dot using something like 4uf at only 400V (I can't recall the exact values, but the voltage was too low). I then changed to using two 8uf 400v in series and all was fine. Don (see post above) told me that fix for the comet shaped dot.
__________________
A digital radio is the latest thing, but a vintage wireless is forever..
stevehertz is offline   Reply With Quote
Old 12th Aug 2022, 12:51 pm   #18
Electronpusher0
Octode
 
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
Posts: 1,963
Default Re: Mullard E7600/4 tube tester card database

I have now found the CRT and housing!

We were moving house and everything was packed up, anyway I have found it now.
I have PMed Roland and will post it.

Peter
Attached Thumbnails
Click image for larger version

Name:	IMG_20220812_124645.jpg
Views:	46
Size:	99.1 KB
ID:	262635   Click image for larger version

Name:	IMG_20220812_130053.jpg
Views:	46
Size:	112.5 KB
ID:	262636   Click image for larger version

Name:	IMG_20220812_124649.jpg
Views:	42
Size:	87.3 KB
ID:	262637   Click image for larger version

Name:	IMG_20220812_124656.jpg
Views:	37
Size:	87.5 KB
ID:	262638  
Electronpusher0 is offline   Reply With Quote
Old 12th Aug 2022, 12:53 pm   #19
Roland Huisman
Tetrode
 
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
Default Re: Mullard E7600/4 tube tester card database

Oh great, including the housing! This will speed up the restoration from the tester. Thanks a lot!

Regards, Roland
Roland Huisman is offline   Reply With Quote
Old 12th Aug 2022, 1:30 pm   #20
Roland Huisman
Tetrode
 
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
Default Re: Mullard E7600/4 tube tester card database

Quote:
Originally Posted by TowerRadio View Post
I had to replace the 4.00 mfd 500v electrolytics for the eht to the crt,I used film ones,4.7mfd. 630v. The focus was useless,after changing electrolytics it was fine.Les
Yes I have to check these two too. I'm afraid that these are bad too...

@stevehertz
Fun to see how these testers evolved. A friend of mine has a CT80 with a countless amount of CV cards. If we have some spare time we want to scan all the cards we have and drop it in a PDF file or something like that. Together we have about 2000+ cards I think... I have some cards that he want and vice versa...

Regards, Roland
Roland Huisman is offline   Reply With Quote
Reply

Thread Tools



All times are GMT. The time now is 8:37 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Copyright ©2002 - 2021, Paul Stenning.