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Old 29th October 2009, 03:58 PM   #101
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DeLite on chalk board was running at 50 volts, assuming that may mix things up a bit.
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Old 29th October 2009, 06:43 PM   #102
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Quote:
Originally Posted by Nelson Pass View Post
I seem to recall from previous efforts getting about 20 ohms
from my bulbs when run at 30V or so.


Nelson, I know you are still working things out, but are the bulbs you used 150w? And likely to stay being 150w? That's what I remember, but if it is confirmed, then at least everyone can obsess over getting the bulbs while you get some breathing room on the design
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Old 29th October 2009, 07:18 PM   #103
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Quote:
Originally Posted by Nelson Pass View Post
You often will find an interesting point around 1 KHz where
the bulb will sing a bit.
Charming.
What is that, 2nd harmonic? Mechanical resonance? Or an inductance from the coiled up filament?
Sounds like a tube thing actually
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Old 29th October 2009, 07:57 PM   #104
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Yap, they do ring. I noticed that with my Zen-lite amp. I think it's the AC-current through the filament changing it's temperature/length. I first thought I was tripping but it kind of makes sense...
Concerning bulbs and their resistance...maybe it's time to reread the Zenlite article.

http://www.passdiy.com/pdf/zenlite.pdf


(btw, I sourced my bulbs when I was on holidays in Mexico, 300W 115V, plus sockets. Luckily still have four in spare...)
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Old 29th October 2009, 08:14 PM   #105
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I missed this one, it covers a lot of questions. I see Mr. Pass is also a Roger Corman fan, I've seen nearly all of them and once did a retrospective of both the Poe cycle and the early sci-fi in separate summers around 1970.
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Old 29th October 2009, 08:58 PM   #106
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A few years ago, as a Christmas present, my wife arranged
for me to lunch with Roger Corman. He is really an amazing
guy.

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Old 29th October 2009, 09:23 PM   #107
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I think I have seen most of the Roger Corman films also. I worked in the local movie theater in high school so I could get in for free. I loved the cheap SiFi movies. I still do. Do you remember who played the patient in the dentist office in Little Shop Of Horrors?
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Old 30th October 2009, 01:02 AM   #108
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Wilbur Force, Jack N. no peeking required. You know your hooked when you start doing the Dick Miller sightings.
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Last edited by scott wurcer; 30th October 2009 at 01:06 AM.
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Old 30th October 2009, 01:14 AM   #109
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Aaaahhh... "Bucket of Blood", the big Dick Miller vehicle.

Last seen in "The Twilight Zone Movie"?

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Old 30th October 2009, 03:47 PM   #110
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