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Old 17th September 2005, 10:13 AM   #1
Giaime is offline Giaime  Italy
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Lightbulb Flourescent lamp choke - use in tube amp?

Hello to all!!!

I found a flourescent lamp choke (you know, heavy white things mounted near the lamp starter). It has 45ohm dc resistance which I just measured. And it has these writings on it:

Type:N/39 Lamp W:30-32-2x14-15 [delta]t:55 tw:120

V:220 Hz:50 And then some semi-cancelled letters:

IL (or maybe TL): 0.xx 0.xx (those x are unreadable numbers)

cosx:0.45 (the x maybe a greek phi)

(note: the [delta] is in greek letter)

What does they mean? How a flourescent lamp works? What does the starter do?

And most important... if this is a choke, can I use it in my tube amp just to filter the B+ for the screens of the power tubes (2 EL84 per channel) and for the anode of the drivers (a couple of ECCxx series)?

Thanks in advance!!!
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Old 17th September 2005, 10:28 AM   #2
kmtang is offline kmtang  Canada
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I believe the choke used in florescent tube is for AC operation. The one we are using for B+ filtering is for DC.

With DC current through a choke designed for AC operation, the magnetic core mostly get saturated and its Inductance will become less significantly.

Just my 2 cents.

Johnny
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Old 17th September 2005, 11:02 AM   #3
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Default How a fluorescent lamp works

A fluorescent lamp works by passing an arc from one end of the lamp to the other. In each end of the lamp there is a small filament like the filament in an incandescent lamp, which is ignited briefly to heat the gas inside the lamp - this is done by the starter which switches the filaments on for a moment and then off (usually several times which is why fluorescents flicker when they come on). The gas inside the tube is a mercury vapour which produces ultra violet light when the arc passes through it, and then the phosphour coating on the inside of the glass of the tube converts the UV to visible light.

The Choke in a fluorescent lamp limits the current that flows through the lamp after the lamp has ignited.

Don't know how this helps with a tube amp though!
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Old 17th September 2005, 11:06 AM   #4
Giaime is offline Giaime  Italy
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Default Re: How a fluorescent lamp works

Quote:
Originally posted by silicon-surfer
A fluorescent lamp works by passing an arc from one end of the lamp to the other. In each end of the lamp there is a small filament like the filament in an incandescent lamp, which is ignited briefly to heat the gas inside the lamp - this is done by the starter which switches the filaments on for a moment and then off (usually several times which is why fluorescents flicker when they come on). The gas inside the tube is a mercury vapour which produces ultra violet light when the arc passes through it, and then the phosphour coating on the inside of the glass of the tube converts the UV to visible light.

The Choke in a fluorescent lamp limits the current that flows through the lamp after the lamp has ignited.

Don't know how this helps with a tube amp though!
Thanks!!! I've searched the net and now I understand how a fluorescent lamp works. Now I'd like to know if someone is using the reactor choke in a tube amp...
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Old 17th September 2005, 11:06 AM   #5
Zen Mod is offline Zen Mod  Serbia
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discussed long time ago on r.a.t
it works
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Old 17th September 2005, 11:07 AM   #6
Giaime is offline Giaime  Italy
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Quote:
Originally posted by choky
discussed long time ago on r.a.t
it works
r.a.t.????? Sorry I don't know this.
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Old 17th September 2005, 06:42 PM   #7
amperex is offline amperex  United States
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The small & common 13-watt twin tube reactors have little inductance. The small inexpensive $8 to $10 Hammond chokes are superior for filtering in power supplies.
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Old 19th September 2005, 01:10 PM   #8
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In the last number of italian magazine "Costruire HiFi" (Building Hi-Fi) is a project of tube pre-amp using a fluorescent lamp choke in the PSU who seems work wery well.


Ciao.
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Old 19th September 2005, 01:13 PM   #9
Giaime is offline Giaime  Italy
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Quote:
Originally posted by gainmona
In the last number of italian magazine "Costruire HiFi" (Building Hi-Fi) is a project of tube pre-amp using a fluorescent lamp choke in the PSU who seems work wery well.


Ciao.

Thanks!!! Anyone has details on this misusing of that choke??? I understand that Hammonds are better, but here in Italy 20 euro + 10s/h.... a bit high.
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Old 19th September 2005, 02:44 PM   #10
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Quote:
Originally posted by Giaime


r.a.t.????? Sorry I don't know this.

Probably the usenet news group: rec.audio.tubes
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