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Old 17th Mar 2010, 11:53 pm   #241
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Default Re: The "Sussex" Homebrew Valve Tester.

Thanks Andy for pointing that error, there is always one no matter how much you check it yourself . I did not even spot it when I placed the transistor on the board, I was more worried about getting the plain plastic side the right way round. For the 6n8 capacitors I used Cricklewood''s CKR6N8, slim ceramics even though rated at 500V , the only 6n8's I could find but fit the board beautifully. Ceramics are certainly not the best choice usually for an oscillator but I don''t think rock hard stability is required here.
Meanwhile I am cursing myself, I had a clear out a few months ago and chucked out a heat sink I knew I would never use. Now I realise it would have been perfect for the Sussex VT.
Les
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Old 19th Mar 2010, 1:18 pm   #242
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Default Re: The "Sussex" Homebrew Valve Tester.

That's called Murphy's Law!!!

I gave up building stuff about 30 years ago.
I gave EVERYTHING away. Scope, Sig Gen. Soldering station, thousands of components etc.
Now, I've got to buy everything again.
For some reason all the tools have got dear, but the discrete components seem cheaper. Oh, and valves are dear now compared to 30 years ago when I had a huge pile of old equipment to cannibalise.

Last edited by Brian R Pateman; 19th Mar 2010 at 1:20 pm. Reason: Quote removed.
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Old 19th Mar 2010, 1:37 pm   #243
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Default Re: The "Sussex" Homebrew Valve Tester.

Quote:
Originally Posted by Guitarist28 View Post
The BOM appears to have an error and I am unable to view it anymore.
Rob,

Seems OK to me.
Can you check again please

Andy
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Old 19th Mar 2010, 2:07 pm   #244
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Default Re: The "Sussex" Homebrew Valve Tester.

Hi Andy,
It still appears to have an error as follows:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; msn OptimizedIE8;ENGB)
Timestamp: Fri, 19 Mar 2010 13:03:59 UTC


Message: Invalid argument.
Line: 8
Char: 88
Code: 0
URI: http://spreadsheets.google.com/clien...core__en_gb.js


secondly, will I be ok to use a 200R and 5k preset for VR1 and VR2 instead of 220R and 4k7 as this is all I have at the mo?

Regards

Rob
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Old 19th Mar 2010, 4:15 pm   #245
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Default Re: The "Sussex" Homebrew Valve Tester.

Quote:
Originally Posted by Guitarist28 View Post
will I be ok to use a 200R and 5k preset for VR1 and VR2 instead of 220R and 4k7 as this is all I have at the mo?
Rob,

The values I used are 200R & 5k.

Andy
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Old 19th Mar 2010, 4:17 pm   #246
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Default Re: The "Sussex" Homebrew Valve Tester.

Rob, That link is a java programme?

Try

Andy
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Old 19th Mar 2010, 4:17 pm   #247
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Default Re: The "Sussex" Homebrew Valve Tester.

oops

http://spreadsheets.google.com/ccc?k...pfMlE&hl=en_GB
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Old 19th Mar 2010, 5:18 pm   #248
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Default Re: The "Sussex" Homebrew Valve Tester.

Hi Andy,
Still no joy. I wonder if it is my machine?

Is anyone else able to view the BOM?

Rob
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Old 19th Mar 2010, 5:26 pm   #249
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Default Re: The "Sussex" Homebrew Valve Tester.

yes, fully viewable here
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Old 19th Mar 2010, 5:28 pm   #250
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Default Re: The "Sussex" Homebrew Valve Tester.

Hi Rob
Just tried it and it opens OK for me

Frank
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Old 19th Mar 2010, 5:33 pm   #251
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Default Re: The "Sussex" Homebrew Valve Tester.

Fine here. Looked at the page properties and it seem to be perfectly ordinary HTML with some javascript.
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Old 19th Mar 2010, 6:18 pm   #252
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Default Re: The "Sussex" Homebrew Valve Tester.

Hi All,
Yes, sorted now.

Thanks
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Old 23rd Mar 2010, 1:55 am   #253
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Default Re: The "Sussex" Homebrew Valve Tester.

Just thought I'd update on my progress....
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Last edited by Brian R Pateman; 23rd Mar 2010 at 5:50 pm. Reason: Images converted to thumbnails.
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Old 23rd Mar 2010, 1:58 am   #254
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Default Re: The "Sussex" Homebrew Valve Tester.

Cutting and drilling the boards is a bitch without the right equipment.

Just a few components waiting to be ordered.......
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Old 23rd Mar 2010, 10:13 am   #255
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Default Re: The "Sussex" Homebrew Valve Tester.

Hi Andy,
Looks a tidy piece of work.

Has anyone (other than Mike R) completed a Sussex yet?

Rob
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Old 23rd Mar 2010, 12:27 pm   #256
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Default Re: The "Sussex" Homebrew Valve Tester.

Quote:
Originally Posted by Guitarist28 View Post
Has anyone (other than Mike R) completed a Sussex yet?
Rob
I have built the boards, got the transformer and the DVM's, just looking for a reasonable case at present.
Andy (real2real)
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Old 23rd Mar 2010, 2:22 pm   #257
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Default Re: The "Sussex" Homebrew Valve Tester.

Hi,
I have the PCB and I've ordered the transformer and DVMs.
I've read the posts on some options for the case.
Does anyone know how we get a case similar to or the same as Mike's.
regards
Craig
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Old 23rd Mar 2010, 3:56 pm   #258
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Default Re: The "Sussex" Homebrew Valve Tester.

Hi Craig,
You'll need to speak to Mike but I beleive that he just used a case that he had to hand, I don't think that it was especially for this project.

It will be interesting to see how everybody tackles the issue of packaging the pcbs, transformer etc., and if there are wealth of different approaches.

Rob
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Old 23rd Mar 2010, 7:54 pm   #259
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Default Re: The "Sussex" Homebrew Valve Tester.

Craig,
Rob is right, I used a case I had to hand.
Were I to start again, I think I would use an AVO VCM type of case, ie, sloping front with a valve panel on the top. I would use my existing front panel layout regarding switches and meters, but would locate the pin selector switches in a row above the meters. This would make setting the pin switches easier to read.
A possible (and cheaper) way of constructing the case would be to make the base and ends of the case from MDF. The other panels from aluminium. These panels would all be flat and easier to fabricate.
Just some thoughts which obiously haven't been tried, but I think would be practical.
Good luck to all builders out there.
Mike
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Old 23rd Mar 2010, 8:23 pm   #260
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Default Re: The "Sussex" Homebrew Valve Tester.

Mike,
Just as a point of clarification, will have to allow a lot of ventilation for the transformer?

Regards

Rob
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