Hi Johnny,
Wht you are calling the "top-cap" is actually called a grid cap and is connected to the control grid on these tubes. On your schematic it is the lead that enters the tube on the left side.
Hope this helps,
Jim
:Hi all! I have here a Montgomery Ward Airline model 62-9. Could someone help me identify on the schematic which pins are which on the tubes? I think I know but I've never seen the tubes drawn like this before. Which symbol is the top-cap of the tube on the 51's and the 24? I've got the heaters figured out. Pretty sure they are pins 1 and 5 on all tubes except the rectifier #80 which are pins 1 and 4. I go to http://tdsl.duncanamps.com/ for most of my tube data. Any help would be great. Thanks!
:Hi Johnny,
:What you are calling the "top-cap" is actually called a grid cap and is connected to the control grid on these tubes. On your schematic it is the lead that enters the tube on the left side.
You are correct that the filament is on pins 1 & 5.
On your schematic, the plate exits the tube on the top and is pin 2.
The screen grid, drawn around the plate, is pin 3
The cathode, entering from the bottom next to the filament, is on pin 4.
There is a good tube reference here on this site.
:Hope this helps,
:Jim
:
::Hi all! I have here a Montgomery Ward Airline model 62-9. Could someone help me identify on the schematic which pins are which on the tubes? I think I know but I've never seen the tubes drawn like this before. Which symbol is the top-cap of the tube on the 51's and the 24? I've got the heaters figured out. Pretty sure they are pins 1 and 5 on all tubes except the rectifier #80 which are pins 1 and 4. I go to http://tdsl.duncanamps.com/ for most of my tube data. Any help would be great. Thanks!
:
:Hi Johnny,
:Wht you are calling the "top-cap" is actually called a grid cap and is connected to the control grid on these tubes. On your schematic it is the lead that enters the tube on the left side.
:Hope this helps,
:Jim
:
::Hi all! I have here a Montgomery Ward Airline model 62-9. Could someone help me identify on the schematic which pins are which on the tubes? I think I know but I've never seen the tubes drawn like this before. Which symbol is the top-cap of the tube on the 51's and the 24? I've got the heaters figured out. Pretty sure they are pins 1 and 5 on all tubes except the rectifier #80 which are pins 1 and 4. I go to http://tdsl.duncanamps.com/ for most of my tube data. Any help would be great. Thanks!
The carhode is next to filament in a tube. Next comes grid #1, control grid. After that grid #2, screen. Maybe other grids than plate which is ouptut from a tube. On a 24 plate is pin #2.
Some early schematics have 24 & 35's drawn differently. Grid #2 also calied shield grid can be drawn as a U surronding the plate.
Plate & screen will connect to positive voltages in a schematic. Cathode ground or a few volts positive. Grid #1 usually slightly negative in relation to cathode.
Grid #1, control grid, is often a top cap in early tubes. Was done this way for a couple reasons. One being not enough pins for everything to be on the base. Tubes stared with 4 pins, went to 5 etc. Also having grid #1 on top keeps it away from plate and other elelents which can cause circuit problems.
In TV & transmitting tubes top cap is plate. Don't worry about this for now..
Norm
Norm
: Johnny, on all tubes your control grid (grid) is the one where the signal enters from prior stage. So as Jim said they enter from left on your schematic. The second grid is the screening grid and on your schematic it shows as a "U" around plate. Plate, of course is the square. Also as Jim mentioned, the grid on the tubes comes out on top of tube to a cap (not a capacitor). PL
:
:
::
:
::Hi Johnny,
::Wht you are calling the "top-cap" is actually called a grid cap and is connected to the control grid on these tubes. On your schematic it is the lead that enters the tube on the left side.
::Hope this helps,
::Jim
::
:::Hi all! I have here a Montgomery Ward Airline model 62-9. Could someone help me identify on the schematic which pins are which on the tubes? I think I know but I've never seen the tubes drawn like this before. Which symbol is the top-cap of the tube on the 51's and the 24? I've got the heaters figured out. Pretty sure they are pins 1 and 5 on all tubes except the rectifier #80 which are pins 1 and 4. I go to http://tdsl.duncanamps.com/ for most of my tube data. Any help would be great. Thanks!
:
:Hi Johnny
:
: The carhode is next to filament in a tube. Next comes grid #1, control grid. After that grid #2, screen. Maybe other grids than plate which is ouptut from a tube. On a 24 plate is pin #2.
:
: Some early schematics have 24 & 35's drawn differently. Grid #2 also calied shield grid can be drawn as a U surronding the plate.
:
: Plate & screen will connect to positive voltages in a schematic. Cathode ground or a few volts positive. Grid #1 usually slightly negative in relation to cathode.
:
: Grid #1, control grid, is often a top cap in early tubes. Was done this way for a couple reasons. One being not enough pins for everything to be on the base. Tubes stared with 4 pins, went to 5 etc. Also having grid #1 on top keeps it away from plate and other elelents which can cause circuit problems.
:
: In TV & transmitting tubes top cap is plate. Don't worry about this for now..
:
:Norm
:
:
:
:
:
:Norm
:
:: Johnny, on all tubes your control grid (grid) is the one where the signal enters from prior stage. So as Jim said they enter from left on your schematic. The second grid is the screening grid and on your schematic it shows as a "U" around plate. Plate, of course is the square. Also as Jim mentioned, the grid on the tubes comes out on top of tube to a cap (not a capacitor). PL
::
::
:::
::
:::Hi Johnny,
:::Wht you are calling the "top-cap" is actually called a grid cap and is connected to the control grid on these tubes. On your schematic it is the lead that enters the tube on the left side.
:::Hope this helps,
:::Jim
:::
::::Hi all! I have here a Montgomery Ward Airline model 62-9. Could someone help me identify on the schematic which pins are which on the tubes? I think I know but I've never seen the tubes drawn like this before. Which symbol is the top-cap of the tube on the 51's and the 24? I've got the heaters figured out. Pretty sure they are pins 1 and 5 on all tubes except the rectifier #80 which are pins 1 and 4. I go to http://tdsl.duncanamps.com/ for most of my tube data. Any help would be great. Thanks!
Jim
::Thanks! I see how it makes sense now. Tubes just drawn a little different on this older set. So am I correct in saying that the #51 tube (top left of schematic) is my RF amplifier, the other #51 is the 2nd IF amp, the #27 to the right is a voltage amplifier? The #24 is the 1st IF amp? What is the #27 directly under the #24?
::
::Hi Johnny
::
:: The carhode is next to filament in a tube. Next comes grid #1, control grid. After that grid #2, screen. Maybe other grids than plate which is ouptut from a tube. On a 24 plate is pin #2.
::
:: Some early schematics have 24 & 35's drawn differently. Grid #2 also calied shield grid can be drawn as a U surronding the plate.
::
:: Plate & screen will connect to positive voltages in a schematic. Cathode ground or a few volts positive. Grid #1 usually slightly negative in relation to cathode.
::
:: Grid #1, control grid, is often a top cap in early tubes. Was done this way for a couple reasons. One being not enough pins for everything to be on the base. Tubes stared with 4 pins, went to 5 etc. Also having grid #1 on top keeps it away from plate and other elelents which can cause circuit problems.
::
:: In TV & transmitting tubes top cap is plate. Don't worry about this for now..
::
::Norm
::
::
::
::
::
::Norm
::
::: Johnny, on all tubes your control grid (grid) is the one where the signal enters from prior stage. So as Jim said they enter from left on your schematic. The second grid is the screening grid and on your schematic it shows as a "U" around plate. Plate, of course is the square. Also as Jim mentioned, the grid on the tubes comes out on top of tube to a cap (not a capacitor). PL
:::
:::
::::
:::
::::Hi Johnny,
::::Wht you are calling the "top-cap" is actually called a grid cap and is connected to the control grid on these tubes. On your schematic it is the lead that enters the tube on the left side.
::::Hope this helps,
::::Jim
::::
:::::Hi all! I have here a Montgomery Ward Airline model 62-9. Could someone help me identify on the schematic which pins are which on the tubes? I think I know but I've never seen the tubes drawn like this before. Which symbol is the top-cap of the tube on the 51's and the 24? I've got the heaters figured out. Pretty sure they are pins 1 and 5 on all tubes except the rectifier #80 which are pins 1 and 4. I go to http://tdsl.duncanamps.com/ for most of my tube data. Any help would be great. Thanks!
:
:The first 51 is the RF amp,like you said. The next tube (24) is a mixer used with the 27 directly beneath which is the oscillator. Then comes the IF amp (51) followed by the detector (27) which feeds the two 47's (AF amps).
:Jim
:
:
:::Thanks! I see how it makes sense now. Tubes just drawn a little different on this older set. So am I correct in saying that the #51 tube (top left of schematic) is my RF amplifier, the other #51 is the 2nd IF amp, the #27 to the right is a voltage amplifier? The #24 is the 1st IF amp? What is the #27 directly under the #24?
:::
:::Hi Johnny
:::
::: The carhode is next to filament in a tube. Next comes grid #1, control grid. After that grid #2, screen. Maybe other grids than plate which is ouptut from a tube. On a 24 plate is pin #2.
:::
::: Some early schematics have 24 & 35's drawn differently. Grid #2 also calied shield grid can be drawn as a U surronding the plate.
:::
::: Plate & screen will connect to positive voltages in a schematic. Cathode ground or a few volts positive. Grid #1 usually slightly negative in relation to cathode.
:::
::: Grid #1, control grid, is often a top cap in early tubes. Was done this way for a couple reasons. One being not enough pins for everything to be on the base. Tubes stared with 4 pins, went to 5 etc. Also having grid #1 on top keeps it away from plate and other elelents which can cause circuit problems.
:::
::: In TV & transmitting tubes top cap is plate. Don't worry about this for now..
:::
:::Norm
:::
:::
:::
:::
:::
:::Norm
:::
:::: Johnny, on all tubes your control grid (grid) is the one where the signal enters from prior stage. So as Jim said they enter from left on your schematic. The second grid is the screening grid and on your schematic it shows as a "U" around plate. Plate, of course is the square. Also as Jim mentioned, the grid on the tubes comes out on top of tube to a cap (not a capacitor). PL
::::
::::
:::::
::::
:::::Hi Johnny,
:::::Wht you are calling the "top-cap" is actually called a grid cap and is connected to the control grid on these tubes. On your schematic it is the lead that enters the tube on the left side.
:::::Hope this helps,
:::::Jim
:::::
::::::Hi all! I have here a Montgomery Ward Airline model 62-9. Could someone help me identify on the schematic which pins are which on the tubes? I think I know but I've never seen the tubes drawn like this before. Which symbol is the top-cap of the tube on the 51's and the 24? I've got the heaters figured out. Pretty sure they are pins 1 and 5 on all tubes except the rectifier #80 which are pins 1 and 4. I go to http://tdsl.duncanamps.com/ for most of my tube data. Any help would be great. Thanks!
Your set must be about the same age as the one that I am just finishing ~1931 as mine uses the same tubes. There seem to be two schools of thought about paper capacitor replacement. One is to wait until they fail before replacing them. The other is to go ahead and do a wholesale replacement while the chassis is on the bench as caps this old are likely to fail soon anyway. Some like to re-stuff the caps, melting the wax and removing the 'guts' then sealing a modern cap inside the paper wrapper to keep the original look.
A really good book (IMHO) is "Old Time Radios! Restoration and Repair" by Joseph J. Carr. Also "Elements of Radio Servicing" by Marcus & Levy which is available at:
http://www.antiqueradios.com/archive.shtml
Jim
::Thanks Jim! Someone recommended a book on vacuum tube theory and I've been reading that but it's 400 pages. I figured starting at the beginning was best rather than jumping in and out of the book grabbing pieces here and there. Some day I'll have all this down. This radio is so clean. Even all of the tubes test good. It has these old paper caps that I even hate to change out. They have "Cub" printed on them and actually look like some kind of fuse rather then a capacitor. It has some huge (physical size that is) resistors in it that are also within a 20% tolerance. The cloth wiring in it is very neat and actually in a harness that runs the perimeter of the chassis with breakouts where necessary. I can actually trace a wire all around the chassis the bundle is so nicely combed. Haven't seen anything like that since I worked on missles.
::
::The first 51 is the RF amp,like you said. The next tube (24) is a mixer used with the 27 directly beneath which is the oscillator. Then comes the IF amp (51) followed by the detector (27) which feeds the two 47's (AF amps).
::Jim
::
::
::::Thanks! I see how it makes sense now. Tubes just drawn a little different on this older set. So am I correct in saying that the #51 tube (top left of schematic) is my RF amplifier, the other #51 is the 2nd IF amp, the #27 to the right is a voltage amplifier? The #24 is the 1st IF amp? What is the #27 directly under the #24?
::::
::::Hi Johnny
::::
:::: The carhode is next to filament in a tube. Next comes grid #1, control grid. After that grid #2, screen. Maybe other grids than plate which is ouptut from a tube. On a 24 plate is pin #2.
::::
:::: Some early schematics have 24 & 35's drawn differently. Grid #2 also calied shield grid can be drawn as a U surronding the plate.
::::
:::: Plate & screen will connect to positive voltages in a schematic. Cathode ground or a few volts positive. Grid #1 usually slightly negative in relation to cathode.
::::
:::: Grid #1, control grid, is often a top cap in early tubes. Was done this way for a couple reasons. One being not enough pins for everything to be on the base. Tubes stared with 4 pins, went to 5 etc. Also having grid #1 on top keeps it away from plate and other elelents which can cause circuit problems.
::::
:::: In TV & transmitting tubes top cap is plate. Don't worry about this for now..
::::
::::Norm
::::
::::
::::
::::
::::
::::Norm
::::
::::: Johnny, on all tubes your control grid (grid) is the one where the signal enters from prior stage. So as Jim said they enter from left on your schematic. The second grid is the screening grid and on your schematic it shows as a "U" around plate. Plate, of course is the square. Also as Jim mentioned, the grid on the tubes comes out on top of tube to a cap (not a capacitor). PL
:::::
:::::
::::::
:::::
::::::Hi Johnny,
::::::Wht you are calling the "top-cap" is actually called a grid cap and is connected to the control grid on these tubes. On your schematic it is the lead that enters the tube on the left side.
::::::Hope this helps,
::::::Jim
::::::
:::::::Hi all! I have here a Montgomery Ward Airline model 62-9. Could someone help me identify on the schematic which pins are which on the tubes? I think I know but I've never seen the tubes drawn like this before. Which symbol is the top-cap of the tube on the 51's and the 24? I've got the heaters figured out. Pretty sure they are pins 1 and 5 on all tubes except the rectifier #80 which are pins 1 and 4. I go to http://tdsl.duncanamps.com/ for most of my tube data. Any help would be great. Thanks!
Those are the two books I down-loaded. They're on my computer so I just sit every night for a couple hours and study. I believe this is a '31 or '32 radio. I am gonna replace the caps. Even the two electrolytics read good but those will go to. If I think I'm up to it I may try to restuff the two metal cans. If not I'll leave them there for looks and do the regular "under-the-chassis" installation of the new ones. Thanks for the help!!!
:
:Hi Johnny,
:Your set must be about the same age as the one that I am just finishing ~1931 as mine uses the same tubes. There seem to be two schools of thought about paper capacitor replacement. One is to wait until they fail before replacing them. The other is to go ahead and do a wholesale replacement while the chassis is on the bench as caps this old are likely to fail soon anyway. Some like to re-stuff the caps, melting the wax and removing the 'guts' then sealing a modern cap inside the paper wrapper to keep the original look.
:A really good book (IMHO) is "Old Time Radios! Restoration and Repair" by Joseph J. Carr. Also "Elements of Radio Servicing" by Marcus & Levy which is available at:
:http://www.antiqueradios.com/archive.shtml
:
: Jim
:
:::Thanks Jim! Someone recommended a book on vacuum tube theory and I've been reading that but it's 400 pages. I figured starting at the beginning was best rather than jumping in and out of the book grabbing pieces here and there. Some day I'll have all this down. This radio is so clean. Even all of the tubes test good. It has these old paper caps that I even hate to change out. They have "Cub" printed on them and actually look like some kind of fuse rather then a capacitor. It has some huge (physical size that is) resistors in it that are also within a 20% tolerance. The cloth wiring in it is very neat and actually in a harness that runs the perimeter of the chassis with breakouts where necessary. I can actually trace a wire all around the chassis the bundle is so nicely combed. Haven't seen anything like that since I worked on missles.
:::
:::The first 51 is the RF amp,like you said. The next tube (24) is a mixer used with the 27 directly beneath which is the oscillator. Then comes the IF amp (51) followed by the detector (27) which feeds the two 47's (AF amps).
:::Jim
:::
:::
:::::Thanks! I see how it makes sense now. Tubes just drawn a little different on this older set. So am I correct in saying that the #51 tube (top left of schematic) is my RF amplifier, the other #51 is the 2nd IF amp, the #27 to the right is a voltage amplifier? The #24 is the 1st IF amp? What is the #27 directly under the #24?
:::::
:::::Hi Johnny
:::::
::::: The carhode is next to filament in a tube. Next comes grid #1, control grid. After that grid #2, screen. Maybe other grids than plate which is ouptut from a tube. On a 24 plate is pin #2.
:::::
::::: Some early schematics have 24 & 35's drawn differently. Grid #2 also calied shield grid can be drawn as a U surronding the plate.
:::::
::::: Plate & screen will connect to positive voltages in a schematic. Cathode ground or a few volts positive. Grid #1 usually slightly negative in relation to cathode.
:::::
::::: Grid #1, control grid, is often a top cap in early tubes. Was done this way for a couple reasons. One being not enough pins for everything to be on the base. Tubes stared with 4 pins, went to 5 etc. Also having grid #1 on top keeps it away from plate and other elelents which can cause circuit problems.
:::::
::::: In TV & transmitting tubes top cap is plate. Don't worry about this for now..
:::::
:::::Norm
:::::
:::::
:::::
:::::
:::::
:::::Norm
:::::
:::::: Johnny, on all tubes your control grid (grid) is the one where the signal enters from prior stage. So as Jim said they enter from left on your schematic. The second grid is the screening grid and on your schematic it shows as a "U" around plate. Plate, of course is the square. Also as Jim mentioned, the grid on the tubes comes out on top of tube to a cap (not a capacitor). PL
::::::
::::::
:::::::
::::::
:::::::Hi Johnny,
:::::::Wht you are calling the "top-cap" is actually called a grid cap and is connected to the control grid on these tubes. On your schematic it is the lead that enters the tube on the left side.
:::::::Hope this helps,
:::::::Jim
:::::::
::::::::Hi all! I have here a Montgomery Ward Airline model 62-9. Could someone help me identify on the schematic which pins are which on the tubes? I think I know but I've never seen the tubes drawn like this before. Which symbol is the top-cap of the tube on the 51's and the 24? I've got the heaters figured out. Pretty sure they are pins 1 and 5 on all tubes except the rectifier #80 which are pins 1 and 4. I go to http://tdsl.duncanamps.com/ for most of my tube data. Any help would be great. Thanks!
Oh-tayyyy. . . .looks like that was waaay back in the days before pentagrid converters, with the oscillator and mixer combined within one tube envelope, such as the later 6SA7-6BE6’s .
So, that lower tube is serving for your local oscillator , with a resultant sampling being fed up into the grid of the tube above it, with mixing action taking place within that tube.
73's de Edd
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:Oh-tayyyy. . . .looks like that was waaay back in the days before pentagrid converters, with the oscillator and mixer combined within one tube envelope, such as the later 6SA7-6BE6’s .
:
:
:So, that lower tube is serving for your local oscillator , with a resultant sampling being fed up into the grid of the tube above it, with mixing action taking place within that tube.
:
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:73's de Edd
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