Resistor Identification
Resistor Identification
I'm trying to restore a 1938 Zenith Beehive radio (5R-312). It's my first time attempting to do a radio repair and I'm having trouble identifying the resistors.
For example, I see a resistor that has a yellow body, violet end, and orange dot. Based on what I'm seeing on the internet, this would translate to 4, 7, 0000 or 470000 ohms resistor (470 K ohms or .47 Mega Ohms).
When I look at the schematic I don't see a .47 Mega Ohm resistor listed. I do see a "470 M Ohm" and also a "47 Ohm" resistor.
Likewise, I see another resistor that is a Brown, Red, Orange, Silver and I believe this should be a 12 kilo ohm +/- 10% resistor but the closest resistor I see on the schematic is listed as a "12 M Ohm" resistor.
What mistake am I making in the conversion or in the way I'm reading the schematic.
For example, I see a resistor that has a yellow body, violet end, and orange dot. Based on what I'm seeing on the internet, this would translate to 4, 7, 0000 or 470000 ohms resistor (470 K ohms or .47 Mega Ohms).
When I look at the schematic I don't see a .47 Mega Ohm resistor listed. I do see a "470 M Ohm" and also a "47 Ohm" resistor.
Likewise, I see another resistor that is a Brown, Red, Orange, Silver and I believe this should be a 12 kilo ohm +/- 10% resistor but the closest resistor I see on the schematic is listed as a "12 M Ohm" resistor.
What mistake am I making in the conversion or in the way I'm reading the schematic.
PaloAltoMark- New Member
- Number of posts : 1
Registration date : 2018-05-25
Re: Resistor Identification
In some old schematics, "M" was used to indicate 1000. So, your 470M ohm resistor would indeed be 470,000 ohms. In those schematics they usually indicate megohms with the whole word.
John Bartley- Member
- Number of posts : 127
Registration date : 2013-04-21
Re: Resistor Identification
I agree with John. I've seen this on a number of early schematics.
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Bill Cahill- Admin
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