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Vintage threads from the first ten years
ohms on 12ax7 heaters
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 7/21/2000 8:38 PM |
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| eth | ohms on 12ax7 heaters I have a whole pile of brimar, mullard, and GE 12ax7's that are used. I figured they were no good because the heater winding halves are all inbetween 6.2 ohms a 8ohms per side.This seemed a bit risky compared to the 19 ohms per side I measured. Are they OK? I know that a cold filament has a heck of alot less resistance than a hot one... Also I have heard of reconditioning the filaments by slowly bringing them up to correct voltage. Thanks mucho for any ideas, I'm kinda curious about these little suckers. Oh yeah, and by the way my guitar amp sounds so good that I randomly jump up and down laughing hysterically like an idiot high on spank! As amatter of fact, just two minutes ago I puked because of the luscious lovelyness that poured forth from my rig. I'm not kidding! If you wait around, are observant and experimental enough, you will realize that Ken Gilbert kicks ass and any one that says different sounds to me like a guitar store salesman that says class A amps are like a race car with the gas pedal pinned and playing the guitar is letting off the brake. (?) So ... Basically I can be a huge doofus, I can get fired, people can laugh at me on the street... and I won't care! Great tone has free'd my soul and Ken Gilbert helped me get there. Thanks Ken! And kiss my ass... whoever wants to! please answer my above question about filaments anyone! Thanks- Eth |
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| 7/21/2000 8:43 PM |
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Stephen Conner |
Don't worry about it. Heaters can't go stale and change their resistance with age, so they must have been made with that resistance on purpose. I don't think trying to recondition them would make any difference.
You must be doing something right then Steve C. | ||
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| 7/21/2000 10:51 PM |
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| Ken Gilbert |
eth.. take it easy, buddy. i feel a bit embarassed. i'm just a man, not anything particularly out of the ordinary. i eat and shit and jerk off just like the rest of us. i was blessed with a brain that's got a good use of both halves, so i guess that's what makes it possible to be a good amp tech--ya gotta keep on thinking and feeling at the same time. honestly though, keep that feeling of euphoria close to your heart. it always ends up fading away all too soon, and then we must begin again at the bottom. you got the ball now--run with it! KG PS oh yeah, heaters can be all over the place, especially older ones. some of them have a sort of "instant on" circuit that causes a bright flash when power is first applied, and i would assume that's due to a very low cold resistance. just plug them in and see if they work. if they light up, they work. |
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| 7/21/2000 11:04 PM |
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| Carl Z |
i eat and shit and jerk off just like the rest of us. Wayyyy too much information my friend! 
Carl Z |
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| 7/21/2000 11:59 PM |
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| Les | i eat and shit and jerk off just like the rest of us. much more than i needed to know too... |
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