| Re: wire wound resistors? [message #339629 is a reply to message #339619 ] |
Wed, 07 May 2008 16:21   |
 J Hinson
Messages: 84
Registered: December 2007 |
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Interesting article!
"All electronic textbooks have been teaching using the wrong variables--voltage and charge--explaining away inaccuracies as anomalies. What they should have been teaching is the relationship between changes in voltage, or flux, and charge."
| Larrchild wrote on Wed, 07 May 2008 13:11 |
(Doesn't Nichrome wire do this?) lol.
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Ya know, now that you bring it up!
Might be worth taking apart some poor unsuspecting girlfriend's hairdryer so that we can try using the heating element as a plate load! You could be on to something there.
B.T.W. did you ever get round to listening to the effects of cheeseburgers and hotdogs?
Here's my schematic to refresh your memory:
Attachment: CCCCS2.jpg
(Size: 204.36KB, Downloaded 299 time(s))
Possession is 9/10ths of the problem.
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| Re: wire wound resistors? [message #340064 is a reply to message #340038 ] |
Fri, 09 May 2008 12:44 |
J Hinson
Messages: 84
Registered: December 2007 |
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| dbock wrote on Fri, 09 May 2008 09:27 |
| Quote: |
I have to say that in mics, I have heard a noticeable difference between metal foil resistors and CC resistors.
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JJ, are you talking about bulk metal foils or common metal films? There's a difference. Also there is thin & thick film, as well as metal oxide.
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Hello David.
JJ said "metal foil" but the example picture he posted of a particular "built to a standard" mic showed metal film.
JJ, that thing in the grid of my schematic is not a resistor, it's a coil. I had it custom wound.
Possession is 9/10ths of the problem.
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| Re: wire wound resistors? [message #340138 is a reply to message #340064 ] |
Fri, 09 May 2008 16:47 |
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 J.J. Blair
Messages: 10048
Registered: May 2004
Location: by the sea & sand |
Diamond Member |
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I meant metal film. I'm sorry. I misspeak and mistype frequently.
In the meantime, I'm measuring the temperature inside this U47 with this concrete encased drop resistor. Within a couple of minutes, the resistor got to 250˚F. After an hour, the air temp inside the mic is almost 160˚ and perhaps climbing still.
Oliver mentioned that when the nickel core of the BV8 transformer gets hot, it loses bass response. He's allegedly sending me a wirewound drop resistor that he made, but in the meantime, I tied a couple of square Caddock resistors together, and lined them with mica. They fit really snuggly against the bottom bell edge, and are being pinned in by a contraption I made.
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| Re: wire wound resistors? [message #341912 is a reply to message #341848 ] |
Fri, 16 May 2008 02:57 |
Dave Hecht
Messages: 296
Registered: February 2005 |
Active Member |
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| J.J. Blair wrote on Thu, 15 May 2008 18:03 |
BTW, going back to the wild tolerances on these carbon comp resistors, those were mainly the ones I ordered theough Antique Electronic Supply. They were Xicons, etc. I got some KOA Speer ones through Mouser that are dead on. If you are going to use carbon comps, I suggest trying those first.
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JJ,
You sure those KOA Speers are carbon comp, and not carbon film? I was looking for some carbon comp and the only ones I could find on their site or at Mouser were carbon film.
As for the tolerances, older carbon comp were typically not too tight on tolerances. RCD Components is making a carbon comp they claim has a 1% tolerance. Haven't tried them yet, but they look interesting - http://www.rcdcomponents.com/rcd/rcdpdf/CC-FA001.pdf
Dave Hecht
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