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Interesting 2x20watt ballast

Interesting 2x20watt ballast

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This 2x20watt ballast has an interesting wiring arrangement. One glow starter is used - both tubes blink and start simultaneously!

IMG_0297.JPG IMG_0299.JPG IMG_0274.JPG IMG_0271.JPG

Light Information

Light Information

Manufacturer:Ferguson
Model Reference:H220P
Lamp
Lamp Type:T12
Electrical
Wattage:2x20watt series
Voltage:240
Physical/Production
Factory Location:Sydney NSW
Fabrication Date:1963

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Filename:IMG_0274.JPG
Album name:cefacat1 / Control Gear
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Date added:Apr 25, 2011
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Date Time:2011:04:26 09:32:34
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xmaslightguy
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^homebuilt fixture


GoL ATL
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Apr 25, 2011 at 09:22 PM Author: xmaslightguy
Interesting a single starter for 2 lamps

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

cefacat1
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Mike


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Apr 26, 2011 at 12:57 AM Author: cefacat1
It does look cool when both lamps blink and start in unison!!

T12 switch-start forever!!

Al_M
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GEC Z9464 90w SOX/LPS


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Apr 26, 2011 at 06:04 AM Author: Al_M
I did a bit of research on Ferguson last week, seems they'd been going a few decades until they were bought out a while back by Telectran Internation P/L. Their website says they still make a limited range of Ferguson gear.

Traffic signals & street lighting engineer. Please bring SOX/LPS back Downunder!!

cefacat1
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Mike


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Apr 26, 2011 at 06:37 AM Author: cefacat1
Yeah most of the old companies have disappeared over the last few years - Soltra was another manufacturer out of Melbourne in the 60s/70s...

I might give Telectran a call though as I'm trying to find some filament transformers so I can put some of my T12s on dimmers. I had some years ago but no-one seems to make them anymore....

T12 switch-start forever!!

Medved
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Apr 26, 2011 at 08:01 AM Author: Medved
The connection to the middle filaments (wires on the right sides) is nothing else then auxiliary winding on the ballast choke (i guess about 6.5..7V when the starter close, so full mains is on the main winding).
Then when the starter close, the ballast act as a transformer and provide voltage heating to these inner filaments. Outer ones are heated in traditional manner by the ballast short circuit current.
Both lamps blink simultaneously, as discharge paths in both of them are directly in series, so the current (if it establish) flow trough both at the same time.

No more selfballasted c***

Al_M
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GEC Z9464 90w SOX/LPS


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Apr 26, 2011 at 09:12 PM Author: Al_M
@Mike, I have an HPM filament transformer that I bought in the late 1990's but I don't think they make them anymore. Was only able to drive T12's which is what you want them for anyway. Good luck with your hunt.

When I was first dabbling in fluoro's I tried running 2x 20w T12's off 1x 58/65w ballast without the proper wiring diagram. I wired both tubes in parallel with 1 starter and they would flash simultaneously but only one would light. Then I found the proper wiring diagram but I didn't know to use S2 starters instead of S10 so of course nothing happened. Bit wiser now!

Traffic signals & street lighting engineer. Please bring SOX/LPS back Downunder!!

cefacat1
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Mike


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Apr 27, 2011 at 04:39 AM Author: cefacat1
@Medved - thanks for the explanation - that makes sense although I'm not sure why they bothered to do that really given it only saves 1 starter in circuit and must have added cost to the ballast at least in manufacturing... Still it does look cool though!

@Al - Yep, I did similar things years ago when I was a kid...until I understood there were actually different starters and that all tubes weren't white!

As far as the filament transformers go I don't think anyone's made them for a while now since dimming is now by electronic dimming ballasts and T8s.

I still prefer the old way with a T12, magnetic ballast, filament transformer and leading edge dimmer! You can get the tubes down to virtually nil output and they show some interesting moving 'ring' patterns..... So, I'm going to keep looking.

T12 switch-start forever!!

SeanB~1
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Apr 27, 2011 at 08:08 AM Author: SeanB~1
You probably will have to wind your own, or do it the easy way and use 2 220-6.3VAC valve filament transformers ( easy to get and they come with a center tap) with the primary windings in series to get the 3VAC the filament needs. Probably the easiest other than winding the 2 windings with 1kV insulation between them on the same core. You can use the same setup to make a flasher with a fluorescent tube and not kill it in minutes.
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jonathon.graves johng917 GeorgiaJohn
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Apr 27, 2011 at 08:53 AM Author: DieselNut
Interesting! Never seen that kind of wiring either!

Preheat Fluorescents forever!
I love diesel engines, rural/farm life and vintage lighting!

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Apr 27, 2011 at 09:58 AM Author: Medved
@cefacat1: The reason may be, then two starters in series are less reliable then single starter (even today it take longer time for series pair to start then single lamp). It happen very frequently, when one starter ignited it's lamp successfully, the second kill the arc at it's unsuccessful attempt. This method avoid the problem, as there is only one starter.

And I guess the starter cost was more then few turns of wire extra, mainly at that time, when all fluorescent related stuff was very expensive and when the production was more manual anyway.
With mass-manufacturing of today the expense with special ballast would offset this, but it was not the case before.

No more selfballasted c***

cefacat1
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Mike


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Apr 28, 2011 at 05:43 AM Author: cefacat1
@SeanB~1 - Thanks for that, I hadn't thought of using a valve filament transformer! Hmmm - investigation of those will take place in the morning - I feel a magnetic dimming T12 project coming on.....

Medved - Thanks again for explaining for me - that makes complete sense and is probably why Ferguson called them a "SureStart" ballast. My kitchen fitting with 3 20watt tubes has two in series and one on it's own 20watt ballast. Using Osram 151s on the series and 111 on the single - the series pair are always the last to start - by a noticable margin. (I do like the extra blinking though!!)

Cheers,
Mike

T12 switch-start forever!!

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