Resistor Color Code - RMA Old Arrangement
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My dad explained it to me, a good 60 years ago, as the 'body-end-dot' system.? Only once have I found a band instead of a dot as the 'decimal multiplier'.? The thing that took me the longest to figure out was the value 470K.? That is, the dot color was the same as the body color so it could not be seen (yellow body, violet end, yellow dot).? Long ago, color wheels that you could dial up the colors and read the numeric values were in every experimenter's kit.? They can still be found.?
On Sunday, August 18, 2024 at 03:26:56 PM CDT, bobkrassa <bob@...> wrote:
A note about the color code on resistors in the SX-23 and perhaps other receivers of this vintage. ?The colors stand for the same numbers as in current practice but the bands are read differently. ?The first number is the "body color" which is the color of the two wide bands of the same color separated by a narrow band. On one end of the resistor is the silver or gold color indicating tolerance, just like today. ?The band between the tolerance color and the body color is the second number. ?This used to be called the "tip color" before tolerance bands were used. Then the narrow band that separates the two wide body color bands is the number of zeroes. ?The best illustration of this that I have found is?
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Figure 2 is the one to use but it should have also shown the silver or gold tolerance band at the left end.
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Bob Krassa AC?JL
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¿ªÔÆÌåÓýBob, get one of these: ? pdf??? 2?? -----? color code???? ??? ?^^ ? ? From: [email protected] [mailto:[email protected]] On Behalf Of haywireman via groups.io
Sent: Monday, August 19, 2024 12:39 AM To: [email protected] Subject: Re: [HallicraftersRadios] Resistor Color Code - RMA Old Arrangement ? My dad explained it to me, a good 60 years ago, as the 'body-end-dot' system.? Only once have I found a band instead of a dot as the 'decimal multiplier'.? The thing that took me the longest to figure out was the value 470K.? That is, the dot color was the same as the body color so it could not be seen (yellow body, violet end, yellow dot).? Long ago, color wheels that you could dial up the colors and read the numeric values were in every experimenter's kit.? They can still be found.? ? On Sunday, August 18, 2024 at 03:26:56 PM CDT, bobkrassa <bob@...> wrote: ? ? A note about the color code on resistors in the SX-23 and perhaps other receivers of this vintage. ?The colors stand for the same numbers as in current practice but the bands are read differently. ?The first number is the "body color" which is the color of the two wide bands of the same color separated by a narrow band. On one end of the resistor is the silver or gold color indicating tolerance, just like today. ?The band between the tolerance color and the body color is the second number. ?This used to be called the "tip color" before tolerance bands were used. Then the narrow band that separates the two wide body color bands is the number of zeroes. ?The best illustration of this that I have found is? ? ? Figure 2 is the one to use but it should have also shown the silver or gold tolerance band at the left end. ? Bob Krassa AC?JL _._,_._,_ -- don??? va3drl |
haywireman
don Root