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In Reply to: RE: My Experience posted by Awe-d-o-file on September 10, 2014 at 07:27:29
Those are carbon composition resistors, not carbon film. Carbon comp might not be the best choices where accuracy and low noise are required. They could be used for their euphonic qualities, but I would never suggest them to a novice.
Peace,
Tom E
Follow Ups:
I didn't say they ere carbon film I said they were my preference. Everyone gets to decide in a free world. : )
ET
I was actually speaking of carbon composition resistors. They're sure a LOT of types of resistors suitable for audio work.
Carbon comps must be baked prior to use to drive out the moisture they have absorbed over the years.
The shock from soldering will alter the resistor permanently if you don't bake it first.
I keep my spare resistors and caps in a sealed plastic tub with about 200 silica gel packs. I always felt that good enough. What do you think?
ET
I work in an aerospace concern, we bake them.
A while back we bought Allen Bradley so we could stock up on carbons (after they had discontinued them).
I suppose if they were dry enough to start out with your method makes sense.
I would give some thought to a bake after buying them, and then use your method for storage.
That is quite interesting. What do you use carbon composite resistors for in the aerospace industry? How do you bake them? Is it something you could do with a kitchen stove?
Dave
"What do you use carbon composite resistors for "
RF in older designs.
" Is it something you could do with a kitchen stove?"
Sure, preheat oven to 150°F, bake for 1hour, then raise to 250°F for an hour, allow to cool and use right away or store with desiccant.
The sudden shock of a soldering iron on a resistor with a lot of moisture permanently changes the value, baking avoids this.
It would have to be an electric stove. Burning natural gas produces moisture.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
What temperature?
TIA!
Dave
I don't know.
In the studio we used to bake audio tape at 130 degrees.
I've never baked resistors.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Interesting! I have some R2R tapes, but none are shredding.
Dave
Its mainly back coated tape that needs to bake to soften up the lube.
Thanks! Great idea!
ET
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