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Old 10th November 2004, 05:34 PM   #21
ingrast is offline ingrast  Uruguay
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The new bulb I find crisper in the yellows, tight in the reds but harsh in the blues. Very detailed overall though.
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Old 10th November 2004, 06:07 PM   #22
Cobra2 is offline Cobra2  Norway
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Default Need help....please

-my solder-iron don't reach....

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Old 10th November 2004, 06:16 PM   #23
Variac is online now Variac  United States
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One mod to screw it in, four members complaining that he has a commercial interest in lightbults so won't let anyone else do it.
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Old 10th November 2004, 11:05 PM   #24
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Has anyone tried using a rectifier to reduce the filament noise in a light bulb?

I've had a few people tell me they've done it, with good results.
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Old 11th November 2004, 12:07 AM   #25
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Quote:
Has anyone tried using a rectifier to reduce the filament noise in a light bulb?
I've had a few people tell me they've done it, with good results.
Actually You`d increase noise due to the switching action of the rectifier diodes.
All You really need is a correctly designed hum-pot!
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Old 11th November 2004, 05:37 AM   #26
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Putting a rectifier in series with a bulb operating on AC is a good way to shorten its lifetime.

Bulbs intended for use with DC usually have filament structures designed to work that way.

Usually...........

Jocko
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Old 11th November 2004, 07:05 AM   #27
Luke is offline Luke  New Zealand
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oooh I got one. If you freeze it for a couple of years it will glow brighter than any bulb twice its power rating
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Old 11th November 2004, 07:33 AM   #28
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Quote:
Originally posted by Jocko Homo
Putting a rectifier in series with a bulb operating on AC is a good way to shorten its lifetime.

Bulbs intended for use with DC usually have filament structures designed to work that way.

Usually...........

Jocko
...Therefore, you need to make sure that the bulb gets the cleanest possible AC, free of any DC offset and of RF interference or noise.

3 members will propose a solid state AC oscillator/rebuilder (PSAudio style).

44 members will then thrash the solid state approach, maintaining that it gives a cold and harsh hue to the light emitted. Replacing the FET's with half a dozen 1938 vintage GE tubes would cure it.

1 member will maintain that, given the use of the above tubes, the AC cleaning circuit for the best light is the one suggested by some obscure Japanese professor in a handwritten note miraculously found after the recent earthquake.

27 members will claim that having adopted the above circuit, they are now able to see things in a much clearer way and with an unprecedented detail. Half of them will also report having been cured of asthma and rheumatism.

52 members will dispute the miraculous claims about the purified-AC-based-exchanged-lightbulb and will demand the findings to be checked in a series of double-blind tests ...quite appropriate, since we're talking about a light bulb!!!
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Old 11th November 2004, 09:20 AM   #29
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Quote:
Originally posted by m.parigi


52 members will dispute the miraculous claims about the purified-AC-based-exchanged-lightbulb and will demand the findings to be checked in a series of double-blind tests ...quite appropriate, since we're talking about a light bulb!!!
...and another 45 members will argue that a "deaf test" would be more appropriate, to eliminate influences from external acoustic vibrations which, as it is well known, can deteriorate light quality...
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Old 11th November 2004, 09:35 AM   #30
ingrast is offline ingrast  Uruguay
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Oh what an incredible oversight!!

To be of any value, the bulb *MUST* be placed in a double screened room so external light light sources are blocked.

Room size and bulb placement are also critical for a correct performance.

I think a software package should be released to simulate different combinations of aspect ratio and walls / ceiling materials to compare effects also.
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