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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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21st Mar 2023, 12:21 pm | #1 |
Hexode
Join Date: Feb 2008
Location: Wrexham, North Wales, UK.
Posts: 465
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Mystery Valve
Has anyone seen a valve like this before?
It's a standard Octal base. The lettering reads: STC C 285 100 SEP-60 |
21st Mar 2023, 12:23 pm | #2 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
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Re: Mystery Valve
It looks more like a quartz crystal to me.
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21st Mar 2023, 12:37 pm | #3 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
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Re: Mystery Valve
Yes I'd say it looks like a quartz crystal. Quite a low-frequency one I'd guess. I wonder if the '100' in the part number means 100KHz? O r the 285 means 285KHz?
[wasn't 285KHz the IF for the old 38-set?]
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21st Mar 2023, 3:00 pm | #4 |
Dekatron
Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 3,086
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Re: Mystery Valve
It looks like a CdS photocell to me.
But hard to tell from photos. |
21st Mar 2023, 3:32 pm | #5 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,825
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Re: Mystery Valve
Looks very similar to the one in this thread post #3
https://www.vintage-radio.net/forum/...d.php?t=170545 Cheers Mike T
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Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
21st Mar 2023, 6:49 pm | #6 |
Heptode
Join Date: Jun 2017
Location: Southport, Merseyside, UK.
Posts: 646
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Re: Mystery Valve
Looks like a photo cell to me as well. Used in 16mm sound projectors.
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21st Mar 2023, 7:21 pm | #7 |
Pentode
Join Date: Jan 2009
Location: Liverpool, Merseyside, UK.
Posts: 149
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Re: Mystery Valve
Quartz crystal
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21st Mar 2023, 8:55 pm | #9 |
Octode
Join Date: Feb 2009
Location: Bletchley, Buckinghamshire, UK.
Posts: 1,205
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Re: Mystery Valve
A quartz crystal, probably 100 kHz.
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