I have a Crosley 52FB that I am restoring.
Kind of similar to the 46FB which has a parts list.
On the 52FB schematic the 1A7 grid resistor is labeled 220M. The 1A7 screen resistor is labeled 68M. The resistor on the top end of the volume control is labeled 150M. At first I thought that these were
220Megohm, 68Megohm and 150Megohm. Looking at the resistors in the set revealed 220K ohm (red red yel)
68K ohm (blu gry org) and 150K ohm (bro grn yel)
The parts list for these resistors in the 46FB confirms that these resistors are in K ohms not
Meg ohms. Did I miss or forget something from my earlier years of "radio learnin". It seems like puting an M on a schematic to indicate K ohms could be and is quite confusing.

Joe,

On the old schematics the roman numeral 'M' was used to denote a multiplier of 1000. Usually if the resistor was in the million of Ohms, it was labeled 'meg' Ohms. Later the 'K' was used on schematics to denote a multiplier of 1000. The year 2000 = MM.

Clifton

:I have a Crosley 52FB that I am restoring.
:Kind of similar to the 46FB which has a parts list.
:On the 52FB schematic the 1A7 grid resistor is labeled 220M. The 1A7 screen resistor is labeled 68M. The resistor on the top end of the volume control is labeled 150M. At first I thought that these were
:220Megohm, 68Megohm and 150Megohm. Looking at the resistors in the set revealed 220K ohm (red red yel)
:68K ohm (blu gry org) and 150K ohm (bro grn yel)
:The parts list for these resistors in the 46FB confirms that these resistors are in K ohms not
:Meg ohms. Did I miss or forget something from my earlier years of "radio learnin". It seems like puting an M on a schematic to indicate K ohms could be and is quite confusing.
:

Thanks tons Clifton. It makes sense if one is doing as Romans do. I remember that now ... you have jostled my memory archives.

Joe

:Joe,
:
:On the old schematics the roman numeral 'M' was used to denote a multiplier of 1000. Usually if the resistor was in the million of Ohms, it was labeled 'meg' Ohms. Later the 'K' was used on schematics to denote a multiplier of 1000. The year 2000 = MM.
:
:Clifton
:
:
::I have a Crosley 52FB that I am restoring.
::Kind of similar to the 46FB which has a parts list.
::On the 52FB schematic the 1A7 grid resistor is labeled 220M. The 1A7 screen resistor is labeled 68M. The resistor on the top end of the volume control is labeled 150M. At first I thought that these were
::220Megohm, 68Megohm and 150Megohm. Looking at the resistors in the set revealed 220K ohm (red red yel)
::68K ohm (blu gry org) and 150K ohm (bro grn yel)
::The parts list for these resistors in the 46FB confirms that these resistors are in K ohms not
::Meg ohms. Did I miss or forget something from my earlier years of "radio learnin". It seems like puting an M on a schematic to indicate K ohms could be and is quite confusing.
::
:

:
:Thanks tons Clifton. It makes sense if one is doing as Romans do. I remember that now ... you have jostled my memory archives.
:
:Joe
:
:
::Joe,
::
::On the old schematics the roman numeral 'M' was used to denote a multiplier of 1000. Usually if the resistor was in the million of Ohms, it was labeled 'meg' Ohms. Later the 'K' was used on schematics to denote a multiplier of 1000. The year 2000 = MM.
::
::Clifton
::
::
:::I have a Crosley 52FB that I am restoring.
:::Kind of similar to the 46FB which has a parts list.
:::On the 52FB schematic the 1A7 grid resistor is labeled 220M. The 1A7 screen resistor is labeled 68M. The resistor on the top end of the volume control is labeled 150M. At first I thought that these were
:::220Megohm, 68Megohm and 150Megohm. Looking at the resistors in the set revealed 220K ohm (red red yel)
:::68K ohm (blu gry org) and 150K ohm (bro grn yel)
:::The parts list for these resistors in the 46FB confirms that these resistors are in K ohms not
:::Meg ohms. Did I miss or forget something from my earlier years of "radio learnin". It seems like puting an M on a schematic to indicate K ohms could be and is quite confusing.
:::
::
:
Do not feel ignorant about the M and K prefixes. MANY a tech has had to have this explained to him, yours truly included. Originally, the old folks used the R
Roman prefixes, so M equaled a thousand. Then they went to the metric system, so K equaled a thousand, and M became Meg, for a Million. A little thinking would give you, for example, a 100 M pot for a volume control, one hundred million Ohms would be very improbable, whereas a hundred thousand would be a very reasonable value. Usually, these old schematics used M for thousand and Meg for million. I wish we had adopted the metric system a hundred years before I was born.
Lewis