Which pin would be the #1 pin on a 33. Know that some tubes have larger pins.It's very common for there to be a gap. But, the 33 has 2 gaps that are the same distance between the two pins. making a 1 tube project and I don't want to wire it wrong.

Looking at the bottom of the tube, it's pin 1 the fat pin on the left. Count clockwise to pin number 5, that's the other fat pin for the filament.

:Looking at the bottom of the tube, it's pin 1 the fat pin on the left. Count clockwise to pin number 5, that's the other fat pin for the filament.
:
:
thanks

:Looking at the bottom of the tube, it's pin 1 the fat pin on the left. Count clockwise to pin number 5, that's the other fat pin for the filament.
:
:
My schematic has pins 3 and 4 for the filament . while the one that is separated from the other 4 is pin 1 and it is for the plate.

::Looking at the bottom of the tube, it's pin 1 the fat pin on the left. Count clockwise to pin number 5, that's the other fat pin for the filament.
::
::
:My schematic has pins 3 and 4 for the filament . while the one that is separated from the other 4 is pin 1 and it is for the plate.
:
Jack,
Here's a base diagram:
http://www.nj7p.org/Common/Tube/SQL/Tube_query.php?Type=33
Carl T

:::Looking at the bottom of the tube, it's pin 1 the fat pin on the left. Count clockwise to pin number 5, that's the other fat pin for the filament.
:::
:::
::My schematic has pins 3 and 4 for the filament . while the one that is separated from the other 4 is pin 1 and it is for the plate.
::
:Jack,
:Here's a base diagram:
:http://www.nj7p.org/Common/Tube/SQL/Tube_query.php?Type=33
:Carl T
:
Thanks! For those who want to look at the book I am using. It's the No.2 book of those little yellow "Gernsback's Educational Library. How to Make The Most Popular All wave 1 and 2 Tube receivers. The radio is on the last page. Could the book be wrong, or did they number the pins differently then?