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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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14th Aug 2022, 6:21 pm | #1 |
Nonode
Join Date: Dec 2002
Location: Coulsdon, Surrey, UK.
Posts: 2,109
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Rare type of UCH42 ?
This made me laugh - discovered sorting through an old box of pulls.
Clearly someone had a boring day at the service bench 🤣 A. |
14th Aug 2022, 6:30 pm | #2 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,923
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Re: Rare type of UCH42 ?
Top cap stuck on.
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15th Aug 2022, 9:44 am | #3 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
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Re: Rare type of UCH42 ?
used in the Mk 7 DAC90A and the experimental FM model the DAC90AFM that never reached production. The output from the FM tuner was injected at the top cap. John.
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15th Aug 2022, 10:01 am | #4 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
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Re: Rare type of UCH42 ?
A developmental version, intended for low-oscillator-radiation shipboard receivers with DC supplies, the signal grid top cap poking into the isolated RF box.
Or someone bored in the workshop..... |
15th Aug 2022, 12:36 pm | #5 |
Dekatron
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 3,273
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Re: Rare type of UCH42 ?
My employer went through a phase of offering free Scotch pies at coffee break and rather like the tobacco tins used for power splitters etc one of these pies sat on top of a bench for several weeks with three BNC connectors pushed into its sides.
Peter |
15th Aug 2022, 1:02 pm | #6 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,800
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Re: Rare type of UCH42 ?
There was also one of the unbiteably hard rock cakes on top of labstock for a couple of years complete with model lighthouse.
Robert's work, I think. I particularly liked the use of sections of a grey ty-rap to make the stairs. David
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15th Aug 2022, 5:02 pm | #7 |
Octode
Join Date: Dec 2019
Location: Owston Ferry, North Lincolnshire, UK.
Posts: 1,689
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Re: Rare type of UCH42 ?
Modified for use as a driver for a long wave transmit pa, or could be used in a pantry transmitter output on it's own
Dave
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20th Aug 2022, 6:19 pm | #8 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,562
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Re: Rare type of UCH42 ?
Is it at all possible the top cap has been stuck on the glass envelope to provide a reliable connection point so it can be capacitively coupled to the electrode structure? Or is it just someone having a bit of fun? I think the odds are weighed towards the latter
Regards, Symon. |
21st Aug 2022, 6:54 am | #9 |
Heptode
Join Date: May 2017
Location: Konongo, Ghana
Posts: 510
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Re: Rare type of UCH42 ?
Since the getter material only partly obscures the top of the valve I think it would be possible to see whether or not the top cap is connected to an electrode.
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Robert |