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Can't Identify Components in Old Guitar Amplifier

Jsprite7660

Oct 31, 2023
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Oct 31, 2023
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Hello,

I'm replacing some components in my guitar amplifier but I can't figure out what these two things are. Attached are photos of both. I think they're capacitors but am not sure. There isn't any print on either of them.

I could not find any schematics for this amp as it is an obscure Webster Electronics amplifier.

Let me know if you have any info on these. Thanks all!
 

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roughshawd

Jul 13, 2020
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That's a really old amp. Can't remember that far back. I think I tested them for resistance and they didn't do anything... I know the store owner was really p.o.'d and told me to just leave it alone... What kind of amp?
 

kellys_eye

Jun 25, 2010
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They both look like resistors to me. The red one certainly is. The value is read from the colours - body, tip, spot. So body red (=2), tip (orange?) =3 and spot (brown?) = x10 multiplier. Value is therefore 230 ohms.

The colours may have changed over the years so the above is just a guess. If you have a test meter you could just measure it. They have a 10% tolerance (the silver band) so the value can vary 'a bit'.

A simple resistance test on the green one will reveal whether it too is a resistor - else it is a capacitor! I still think 'resistor' although it has been badly overheated.
 

danadak

Feb 19, 2021
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1704507126588.png

Great ref material https://alliedcatalogs.com/index.htm

Carbon R's in old gear usually out of spec, especially ones that run hot, such as Cathode and Plate R's,
power supply V dropping R's, screen grid R's.

Regards, Dana.
 
Last edited:

kellys_eye

Jun 25, 2010
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Cathode resistors commonly fail due to capacitor failure - change the capacitors first. Then change the obviously overheated resistors. Unless the remaining resistors read well outside their tolerance I'd leave them alone.
 

Jsprite7660

Oct 31, 2023
7
Joined
Oct 31, 2023
Messages
7
That's a really old amp. Can't remember that far back. I think I tested them for resistance and they didn't do anything... I know the store owner was really p.o.'d and told me to just leave it alone... What kind of amp?
It sounds amazing, t's a Webster Electric (From Racine Wisconsin) amplifier. It's probably an early 60's I feel.
 

Jsprite7660

Oct 31, 2023
7
Joined
Oct 31, 2023
Messages
7
Cathode resistors commonly fail due to capacitor failure - change the capacitors first. Then change the obviously overheated resistors. Unless the remaining resistors read well outside their tolerance I'd leave them alone.
Sounds good will do. I was planning on checking the filter caps mainly and then came across those and was confused. Thanks!
 

Jsprite7660

Oct 31, 2023
7
Joined
Oct 31, 2023
Messages
7
They both look like resistors to me. The red one certainly is. The value is read from the colours - body, tip, spot. So body red (=2), tip (orange?) =3 and spot (brown?) = x10 multiplier. Value is therefore 230 ohms.

The colours may have changed over the years so the above is just a guess. If you have a test meter you could just measure it. They have a 10% tolerance (the silver band) so the value can vary 'a bit'.

A simple resistance test on the green one will reveal whether it too is a resistor - else it is a capacitor! I still think 'resistor' although it has been badly overheated.
Cool, thanks a lot!
 
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