tube numbering - Printable Version
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tube numbering - murf - 12-27-2012
Hi Guy's,
Does anyone know the numbering sequence on a number 42 tube(6 pin).
I need to know which is number one pin.
murf
RE: tube numbering - LedHed - 12-27-2012
The two thick pins are 1 and 6. Pin one should be the thick one on the right viewed from the tube bottom IIRC.
RE: tube numbering - murf - 12-27-2012
That's what I thought.
Wanted to make sure.
Thanks
RE: tube numbering - Ron Ramirez - 12-27-2012
No, no, no, no!
Pins 1 and 6 are indeed the larger of the two pins, but as viewed from the bottom Pin 1 is the large pin on the left. You then count clockwise from there - 2, 3, 4, etc.
Take a look at this link - it shows the correct numbering for the 42:
http://www.nj7p.info/Common/Tube/SQL/Tube_query.php?Type=42
RE: tube numbering - LedHed - 12-27-2012
Looking at the tube from the bottom? Under the chassis looking at the bottom of the socket I thought it was on the right... Yikes... Hope I didn't hose you up!
RE: tube numbering - codefox1 - 12-28-2012
Yup, from bottom because that's how the repairmen or builder sees it. The fatt pins on old tubes are always the filament.
RE: tube numbering - TA Forbes - 12-28-2012
An RCA Receiving Tube Manual is a good thing to have. They diagram each tube and have the pin numbers (bottom view).
For the older sets with tubes like the 42 you should have an older manual, as the newer ones list the older tubes in the back of the manual but do not include the pin diagrams.
FYI a tube substitution manual is another good resource to have on your bench.
RE: tube numbering - codefox1 - 12-29-2012
The anti-intuitive nomenclature was no doubt invented by a very clever Kangeroo.
You can get old time manuals and keep you reading for the next century here:
http://www.tubebooks.org/technical_books_online.htm