Help ident resistors

[Retroman839]

Resistor no 1


Resistors no 2

Resistor no 3


Locations are the same on pfx chassi
The Schismatic isn’t clear enough for me to read the resistor value from .
Any help appropriated.
I can & will lift a leg and read the ohms
But I don’t want to rely on my shaky skills soley just yet ..
Any help appreciated ..
One pink one looks good condition
Also I have a working chassis of both types so I can and will ohm them .
But nice to have a number if anyone knows what it should be to cross ref: whilst I read them 👍 thanks

 

[Retromanic2]

This should help you out...

https://uk.farnell.com/resistor-colour-code-calculator

 

[Retroman839]

Thanks I’m giving it a go
I actually can’t tell what the colours on the bands are.
Not sure if a colour has faded .
This should be a big help thanks

 

[69er]

Colour bands are read from the 3 close together end usually the 4th band is gold +\- 5% or silver +\- 10%.
Black is 0 brown is 1 red is 2 orange 3 yellow 4. Green is 5 blue 6 violet 7 grey 8 and white 9
First two make up the 2 digit number and the 3rd band is the multiplier ie add the number in zeros
Eg yellow violet red would be 4 7 00 ohms
Brown black red 1 0 00 thousand ohms or one kilohm 1k
Orange orange orange 33000 you just need the colour clear the gold 5% enable values to range so all digits 1-99 don’t all need manufacturing
Then the physical size is the wattage small are quarter watt bigger are half watt 1W 2W
And on bigger ones pier wattage is often written it’s not too difficult work out from that ?

 

[69er]

Most common first two band digits are 10 12, 15, 18, 22, 27, 33 , 39 , 47 , 56, 68 ,82.

 

[Retroman839]

Most common first two band digits are 10 12, 15, 18, 22, 27, 33 , 39 , 47 , 56, 68 ,82.

69er thank you I get it ..
Just having trouble seeing the colours
Amd even if there is a band.
Like I’m not sure if I’m seeing a faint silver or if it’s white or silver etc…

 

[Retroman839]

Most common first two band digits are 10 12, 15, 18, 22, 27, 33 , 39 , 47 , 56, 68 ,82.

Is this
Is this 4 bands black , white , red & gold ?
900 ohms ….

Or Black , white , brown & gold 90 ohms ?

 

[ArcadePCB]

I've never seen a resistor colour code beginning with black before. I'd take the ohms meter and make a short check. Even if there is something in parallel manipulating the reading you can be sure, the real value is never lower than the displayed value. This should help at least to find out if it's 90 Ohms or 900 Ohms. If your reading is e.g. 250 Ohms, the resistor can't be a 90 Ohms resistor, but it can be a 900 Ohms resistor. If you want to measure the correct value, desoldering at least one side of the resistor is required.

 

[Retroman839]

I've never seen a resistor colour code beginning with black before. I'd take the ohms meter and make a short check. Even if there is something in parallel manipulating the reading you can be sure, the real value is never lower than the displayed value. This should help at least to find out if it's 90 Ohms or 900 Ohms. If your reading is e.g. 250 Ohms, the resistor can't be a 90 Ohms resistor, but it can be a 900 Ohms resistor. If you want to measure the correct value, desoldering at least one side of the resistor is required.

Thanks yeh
Tell me about it !
will ohm it today
And a the known good ones
I should be ok then ..
Thanks

7.5k pfx R830
I also metered sanwA 29831s

Just for cross ref: as I have the service for this so I can cross ref: 6.3 k with the manual @ R 810

Both ver: pfx pm1775c & KW0606a both had 7.5k @ R830

 

[cliff_poole]

If you've got schematics, check the value there if you can.

I've seen this before. They are flame proof resistors, designed to get hot without catching fire. Unfortunately over time, the heat changes the colour of the bands.

 

[Retroman839]

If you've got schematics, check the value there if you can.

I've seen this before. They are flame proof resistors, designed to get hot without catching fire. Unfortunately over time, the heat changes the colour of the bands.

Cheers cliff ,
I have but unfortunately they are beyond readable . Tried last night with zoom and magnify glass.. still couldn’t read em!

But flame proof is a massive bit of info
Pretty important that! Nice one

 

[TheDaddy]

I wrote some software a while ago and as said never seen black as first colour ! on my software its not even an option.

Dave.

 

[Retroman839]

I wrote some software a while ago and as said never seen black as first colour ! on my software its not even an option.

Dave.

That would partly explain why I was scratching my head .. third band
I didn’t know if it was red or a crack in the outer casing !
Basically I wasn’t ever going to be able to read this resistor from the bandings.
This pair of resistors , you can clearly see 7.5k I’m wondering if this had banding once upon a time ?
May even be the same …
But this is very swollen ..
expecting 16 ohms from the 2 combined if ok .

 

[Retroman839]

Ok getting closer found same location
On the 29e schismatic …
This resister 33k .. so I should be able to distinguish the pfx schimatic now

 

[Retroman839]

Pfx shcimatic - unreadable.
But I think I have found it .
And I think it says 47k 3w.

Tomorrow I will pull it and meter it .
It lives in circuit with a zener and a small high voltage pillow cap.
Which feeds the transformer.

 

[Retroman839]

Measured 47k in circuit.
It’s actually good .. but traces and pads are just dangling !

 

[Retroman839]

Resistor measured 57k out of circuit
47k in circuit.
Which value do I buy 57k or 47k ?

 

[TheDaddy]

IMO Out of circuit.

Dave.

 

[grobda]

out of circuit is the resistance of the component.

in circuit is the resistance between the two points you're testing, not the resistance of the component.

 

[Retroman839]

If buying a 47k resister the 47k
Is the in circuit under load value ?