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Old 21st Oct 2020, 3:13 pm   #1601
Ed_Dinning
Dekatron
 
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 6,339
Default Re: The "Sussex" Homebrew Valve Tester.

Yes, voltages on tube sockets should be taken under load and should be within 10% of nominal value.Grid stoppers (in series with grid pin) are typically about 1000 ohms.

If you have a scope you could look at the valve electrodes, but note that with this sort of oscillation the scope probe my well stop it !

Ed
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Old 7th Nov 2020, 5:17 pm   #1602
oldgeezer
Pentode
 
Join Date: Oct 2014
Location: St Albans, Hertfordshire, UK.
Posts: 128
Default Re: The "Sussex" Homebrew Valve Tester.

Having spent the last few days reading this excellent thread, I've started collecting the parts for my build of the 'sussex'.

Meters ordered from ebay, pcb on way. Transformer - still looking st the pile of transformers in the attic as I'm sure one (or two) can be put to use.

Wish me luck in the lockdown!!!
Keith
G8VMP
(just wondering - anyone in 2m radio range of St Albans?)
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Old 7th Nov 2020, 7:12 pm   #1603
vidjoman
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Join Date: Jun 2013
Location: East Sussex, UK.
Posts: 2,565
Default Re: The "Sussex" Homebrew Valve Tester.

Best of luck. It’s an excellent valve tester but I would recommend that most leads are fitted with ferrite beads to avoid any possibility of oscillation. It’s easy to get and difficult to eradicate. I built mine with plenty of beads and never had any problems. Make sure that all the meters are fed from separate power supplies.
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Old 11th Nov 2020, 5:12 pm   #1604
marcoamf
Diode
 
Join Date: Oct 2020
Location: São Paulo, Brazil
Posts: 4
Default Re: The "Sussex" Homebrew Valve Tester.

Getting back to thank you and mention that I installed the ferrite beads and the tester is now working like a charm.
Thank you, guys! You rock!
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Old 21st Nov 2020, 2:12 pm   #1605
theschoolmaster
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Join Date: Apr 2019
Location: Robertsbridge, East Sussex, UK.
Posts: 3
Default Re: The "Sussex" Homebrew Valve Tester.

Quote:
Originally Posted by G8UWM-MildMartin View Post
I still have (28) PCBs for sale at cost (8.12 GBP).
Plus, maybe, the cost of a padded envelope, depending on whether any suitable used ones are being thrown away at work, plus the ever-increasing Royal Mail postage cost, minus the discount from using the franking machine at work, plus any applicable curency transfer or exchange fees.
Best regards,
Martin.
Hi Martin.
I would very much like to buy a set of PCBs - if you have any left this late in the day!!

Last edited by AC/HL; 21st Nov 2020 at 4:44 pm. Reason: email address removed.
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Old 21st Nov 2020, 2:14 pm   #1606
theschoolmaster
Diode
 
Join Date: Apr 2019
Location: Robertsbridge, East Sussex, UK.
Posts: 3
Default Re: The "Sussex" Homebrew Valve Tester.

Quote:
Originally Posted by Ed_Dinning View Post
Hi Folks, Sussex transformers are still available and are wound to order. PM me if you need one and I'll get it wound on my return.

Ed
Hi Ed.
Any chance you can still supply these? What would the cost be?
Thanks,
David
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Old 22nd Nov 2020, 8:11 pm   #1607
oldgeezer
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Join Date: Oct 2014
Location: St Albans, Hertfordshire, UK.
Posts: 128
Default Re: The "Sussex" Homebrew Valve Tester.

Meters arrived from China...
Have pcb from Martin....

Just got to check BOM vs PCB holes and order the bits!

(and find a case!)
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