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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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4th Oct 2015, 12:34 pm
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#1 |
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Heptode
Join Date: May 2015
Location: Bradford, West Yorkshire, UK.
Posts: 512
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IC connection on valves
I often see "internal connection only do not use", on some valves, has anyone explored these to see what they actually connect to. ?
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4th Oct 2015, 12:47 pm
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#2 |
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Hexode
Join Date: Jul 2003
Location: Leeds, West Yorkshire, UK.
Posts: 458
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Re: IC connection on valves
I think a lot of the time these are because the pin is used for internal supports or ties.
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4th Oct 2015, 1:26 pm
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#3 |
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Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,394
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Re: IC connection on valves
Beware that the same valve type may have "IC" pins connected to different electrodes between different manufacturers as the precise details of internal construction frequently varied- presumably to best suit differing jigs, stamping dies and so on. Just occasionally, this can cause a problem where an equipment designer uses an IC pin for layout convenience having been used to a particular valve manufacturer's pin-out. Poor practice, really.
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4th Oct 2015, 2:19 pm
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#4 | |
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Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: IC connection on valves
Quote:
 The reason for that practice of course is simply that of saving a few pennies on additional tag-strips, etc., which over a significant production run would have saved several pounds. However, when I'm gazing at the component layout beneath chassis and getting really confused, trying to work out just what connects to what, (let alone why  ), I sometimes re-configure the connections & layout so that any internal connections are simply not used.Al. |
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