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 Faded valve identification numbers: Some tech tips for reading them
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 Return to top of page · Post #: 1 · Written at 1:57:00 PM on 1 October 2020.
GTC's avatar
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6406

 Return to top of page · Post #: 2 · Written at 12:18:04 PM on 2 October 2020.
Brad's avatar
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6851

I'd never heard of a blacklight being used before but it looks like it works. I've usually resorted to breathing on a valve to make the stamp readable, though that doesn't work in the summer months and relies on not all of the original 'ink' being rubbed off the glass.

A valve a day keeps the transistor away...

 Return to top of page · Post #: 3 · Written at 11:54:27 AM on 9 October 2020.
Simplex's Gravatar
 Location: Bathurst, NSW
 Member since 7 August 2008
 Member #: 336
 Postcount: 351

Handy tip, must get a black light.

 Return to top of page · Post #: 4 · Written at 12:20:01 PM on 9 October 2020.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 513

I’ve ordered one, hopefully to make sense out of an A4 box full of unknown valves.

 Return to top of page · Post #: 5 · Written at 3:56:59 PM on 9 October 2020.
Robbbert's avatar
 Location: Hill Top, NSW
 Member since 18 September 2015
 Member #: 1801
 Postcount: 1736

Looks like an interesting concept. I had a number of unknown valves, but was able to work them all out by what they looked like, or by checking the internal connections.

I've had a black light incandescent bulb for many years but I had no idea it could read valve numbers.

 Return to top of page · Post #: 6 · Written at 11:33:08 PM on 9 October 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4746

I did put that into an article in the Radio Club mag last month. No feedback yet.

 Return to top of page · Post #: 7 · Written at 9:24:14 AM on 10 October 2020.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1816

I have actually downloaded the phone app for this and will let you know how it goes.

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