I just purchased an old tube preamp and am I am having a tough time translating the color codes from these two old ceramic cylindrical capacitor. I find conflicting information on the web and my LC meter tells me something completely different. Could someone take a crack at reading this cap, based upon what you see?
Thanks.
John
Thanks.
John
Attachments
it's a little hard to see the color bands it is the two components that appear different than to the resistors?
if so and if i'm reading the bands correctly it would/should be 250 picofarad.
but looking at these reminds me of encapsulated wire wound inductors which would make them 250 micro henry inductors.what are these selector swicthes intended to do in this amp?
if so and if i'm reading the bands correctly it would/should be 250 picofarad.
but looking at these reminds me of encapsulated wire wound inductors which would make them 250 micro henry inductors.what are these selector swicthes intended to do in this amp?
The colors as I read them (not much clearer in real life) are silver, brown, green, red. Could you explain how you came up with 250 pF? This rotary swiich selects the input soure. Ie., RIAA, NAB, Tape, 78, etc.
Thanks again.
well that just revealed alot when listing color code bands silver gold or nc (no color) are tolerances that are usually listed last.
if they are on the source selector they well could be hi frequency filters.
as far as a schematic you might be hard pressed as it looks like one of the many kit amps of the time based on the williamson circuit.eico heath and knight along with allied are all companies that made and distributed kit amps like this back in the day.this is not to say that with a little archival research you may be able to track down the origins of your vintage treasure.
if they are on the source selector they well could be hi frequency filters.
as far as a schematic you might be hard pressed as it looks like one of the many kit amps of the time based on the williamson circuit.eico heath and knight along with allied are all companies that made and distributed kit amps like this back in the day.this is not to say that with a little archival research you may be able to track down the origins of your vintage treasure.
Could the silver be the first color band? I.e., is it the temperature coefficient? See about half way down this link:
Color codes for Capacitors
Definately not.
Silver and Gold are exclusively tollerence reading.
Brown and pink are also used.
Silver and Gold are exclusively tollerence reading.
Brown and pink are also used.
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That was not the capacitor shown in the photo. If it had been that type of, to give it its correct name, CONDENSOR, I would have pointed that out.
I would have to agree that according to Figure 3-23. - Ceramic capacitor color code, the silver could be the first and represent a temperature coefficient.
That would make it
brown =1
green =5
red =2
or 15 x 10^2 = 1500pF at probably 20% tolerance (no band for tolerance)
Learn something every day.
🙂
Measure it and tell us what the value is...250pF or 1500pF.
Even a cheap meter can tell the difference.
Capacitors
and look at
File:EIA Capacitor Color Codes.jpg - Wikipedia, the free encyclopedia
I hope that clarifies your query.
Colour codes are the same value as resistors. Most "Dog Bone" condensers have an arrow to show the direction to read the colours but bear in mind, we were limited to E12 values unless they are special value components.
and look at
File:EIA Capacitor Color Codes.jpg - Wikipedia, the free encyclopedia
I hope that clarifies your query.
Colour codes are the same value as resistors. Most "Dog Bone" condensers have an arrow to show the direction to read the colours but bear in mind, we were limited to E12 values unless they are special value components.
If the tolerance band (silver) is read first then:
152 = 1500pf
Are you are using the meter leads to attach to the cap in question? If so you must null out the capacitance of the leads or subtract the value of lead capacitance and your hands if you are holding the leads. That value can be several hundred pf.
🙂
152 = 1500pf
Are you are using the meter leads to attach to the cap in question? If so you must null out the capacitance of the leads or subtract the value of lead capacitance and your hands if you are holding the leads. That value can be several hundred pf.
🙂
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