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Is this a 3 band resistor?
Old 1 week ago
  #1
Is this a 3 band resistor?

Im pretty sure this is a 3 band resistor or is read like a 3 band resistor (body/end/stripe) and if so, is 68k at 10%

If that's true, it's reading 89k!

Am i reading it right?
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Is this a 3 band resistor?-20190813_193632.jpg  
Old 1 week ago
  #2
Gear Head
 
S_mask's Avatar
 

You're measuring it right. When you read it, the first color is grey, so that's an 8. If the next color is blue, that should be a 6. If 6 could be 9, then everything else's fine, since orange is the 1 k that makes 89k... It's high, but not kiss-the-sky high...

http://www.resistorguide.com/resisto...de-calculator/
Old 1 week ago
  #3
Quote:
Originally Posted by S_mask View Post
You're measuring it right. When you read it, the first color is grey, so that's an 8. If the next color is blue, that should be a 6. If 6 could be 9, then everything else's fine, since orange is the 1 k that makes 89k... It's high, but not kiss-the-sky high...

http://www.resistorguide.com/resisto...de-calculator/
Odd. So it reads like a 4 band still?

I can't really tell compositon either. Im kmagkning it's and old carbon comp but it feels........plasticy
Old 1 week ago
  #4
Lives for gear
If the gray things on the ends are metal, it would look like a carbon film resistor... of the same vintage as the rest of the stuff on the photo.
Old 6 days ago
  #5
Gear Addict
 
audiospecific's Avatar
 

Quote:
Originally Posted by sameal View Post
Im pretty sure this is a 3 band resistor or is read like a 3 band resistor (body/end/stripe) and if so, is 68k at 10%

If that's true, it's reading 89k!

Am i reading it right?
Close, but backwards Sam. Its 86K @10%

This series of 4 band has the 2nd band repeat on the body after the multiplier. Erie or Stackpole brand resistor.
Old 6 days ago
  #6
Quote:
Originally Posted by audiospecific View Post
Close, but backwards Sam. Its 86K @10%

This series of 4 band has the 2nd band repeat on the body after the multiplier. Erie or Stackpole brand resistor.

Ah!. Thanks. Im thinking under the heat of the tube amp these get out of spec even farther. At least i can read 'em now!
Old 6 days ago
  #7
Gear Addict
 
audiospecific's Avatar
 

Quote:
Originally Posted by sameal View Post
Ah!. Thanks. Im thinking under the heat of the tube amp these get out of spec even farther. At least i can read 'em now!
I wouldn't think as much on the grey body ones, They oversized them on purpose so that it doesn't generate a lot of self noise. I wouldn't worry about them unless they are causing noise. The electrolytic right by there I would definitely change because those really degrade with age..

Usually, when these resistors get really noisy, the outer casing is compromised (usually, a crack along the mold seam) when that happens, rust forms on the lead going out of the body.
Old 5 days ago
  #8
Quote:
Originally Posted by audiospecific View Post
I wouldn't think as much on the grey body ones, They oversized them on purpose so that it doesn't generate a lot of self noise. I wouldn't worry about them unless they are causing noise. The electrolytic right by there I would definitely change because those really degrade with age..

Usually, when these resistors get really noisy, the outer casing is compromised (usually, a crack along the mold seam) when that happens, rust forms on the lead going out of the body.
The weird thing with this amp can is, all those look like electrolytic caps, but they read like film caps now do. .25mfd @ 400v
Old 5 days ago
  #9
Gear Addict
 
audiospecific's Avatar
 

Quote:
Originally Posted by sameal View Post
The weird thing with this amp can is, all those look like electrolytic caps, but they read like film caps now do. .25mfd @ 400v
Its a paper and oil cap. They develop extra resistance in series when they dry out. Usually, you can bridge across them with something around the same value if there is loss in response, and I would use a film and foil cap (round wound, non-metallized poly)in parallel. Still far superior to those Wima box capacitors, even aged out of tolerance.
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