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1948 Sylvania "Dua-Lamp" F40T12 Preheat fixtures never been used.

1948 Sylvania "Dua-Lamp" F40T12 Preheat fixtures never been used.

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These two were boxed up and show absolutely no signs of use, no scratches, scuffs, dings. Perfect MINT condition. No lamps or starters installed. Ballast input leads still have perfectly factory stripped ends.

dab925f4-24ec-4f57-9faf-3e800acba7a2.jpe sylvaniapreheater2.jpe SylvaniaPreheater__48.jpe sylvaniapreheater4.jpe

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Filename:SylvaniaPreheater__48.jpe
Album name:BlueHalide / New album
Keywords:Lanterns
File Size:92 KB
Date added:Jul 12, 2016
Dimensions:972 x 547 pixels
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BlueHalide
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Jul 12, 2016 at 09:19 PM Author: BlueHalide
There was only two of these, already have both wired up an running. The fixtures use 93w and 92.5w and are dead silent. Ballasts running nice and cool too Incredible these havent been touched for 68 years
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OVM


xelareverse UCjohSkrTwJJJzpc_r8D3vKw xelareverse
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Jul 12, 2016 at 09:31 PM Author: xelareverse

LED Toobs minus Too equals LED bs

Potato

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Jul 12, 2016 at 09:50 PM Author: nicksfans
I think you get the unofficial Find of the Month award. Seriously, that is awesome. I can't believe they just sat there for so long!

I like my lamps thick, my ballasts heavy, and my fixtures tough.

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GoL Solanaceae.Keif.Fitz Keif Fitz bubby_keif
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Jul 12, 2016 at 10:54 PM Author: Solanaceae
Good thing these don't have crapped out ballasts like the other one.

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Jul 12, 2016 at 11:34 PM Author: Ash
Wow good find
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Rare white reflector


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Jul 13, 2016 at 12:19 AM Author: Silverliner
AWESOME SAVE!!!

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Jul 13, 2016 at 05:08 AM Author: rjluna2
Wow!

Pretty, please no more Chinese failure.

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Jul 13, 2016 at 09:51 AM Author: BlueHalide
Yup, I was ready to pay anything the new building owner wanted for them as I wanted to ask before I just shoved these in my truck lol. But he didnt want anything for em. Btw I removed and tested three more ballasts from the fixtures that were used/in service and they run invariably hot and all use more power than these two NOS fixtures. After a night of running these two fixtures are still at 92w this morning and ballasts a normal temperature. I am running full power F40's on them too with some modern GE FS4 plastic starters.
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GoL Solanaceae.Keif.Fitz Keif Fitz bubby_keif
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Jul 13, 2016 at 10:00 AM Author: Solanaceae
Odd. I guess the used ones drew in moisture. Too bad. At least you could save the cloth wires from the ballast if they're in good shape or use as a display piece of paperweight.

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Jul 13, 2016 at 11:31 AM Author: Ash
Can you measure the power factor of the old vs new ones ? That can maybe tell whats going on
BlueHalide
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Jul 13, 2016 at 04:04 PM Author: BlueHalide
Power factor of both new fixtures is .91, the used ballasts are at .69 at the lowest and .72 at the highest.
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GoL Solanaceae.Keif.Fitz Keif Fitz bubby_keif
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Jul 13, 2016 at 04:12 PM Author: Solanaceae
Sounds like shorted caps.

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Jul 13, 2016 at 07:04 PM Author: nicksfans
Yeah, I guess whatever caps Sylvania used don't hold up as well as others. Or maybe the fixtures just have very high hours.

I like my lamps thick, my ballasts heavy, and my fixtures tough.

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BlueHalide
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Jul 13, 2016 at 09:48 PM Author: BlueHalide
After some research and asking around I found that the last year these fixtures saw regular 24 hour per day use was in 2006, apparently four manufacturers occupied this factory since the 40's, and production usually ran 7 days a week, all three shifts around the clock for most of those companies. That means if my calculations are correct these fixtures have seen something to the tune of 500,000 hours of use, and almost all of them still have the original ballasts, there are very few modern ballasts in these.

Also, a few of you have PM me about the two NOS lights above, so ill just give everybody the scoop. I am more than willing to trade however I really would rather not ship these. UPS gave me a quote of $90 to ship one just within the midwest. Substantially more to east or west coast. These fixtures weigh 32lbs each! So, if any of you want to drive to northern Illinois, thats about the only way im going to do it. I can already see UPS or FedEx denting these up with poor handling.
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Jul 13, 2016 at 09:52 PM Author: nicksfans
Well, at 500,000 hours, the caps have every reason to be failing. That is amazing! Let's see the LED driver that can pull that off.

I like my lamps thick, my ballasts heavy, and my fixtures tough.

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GoL Solanaceae.Keif.Fitz Keif Fitz bubby_keif
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Jul 13, 2016 at 09:55 PM Author: Solanaceae
I'd be in Kyle, but I can't drive sadly.
Also here's a theory told to me by Rick the bulb.
The ballasts running will produce heat, just enough to repel water, and with near constant use the water would stay out. When they were taken out of use, the heat went away, so the ballasts would've drawn in moisture from condensation, leaking roof, etc. also, after years the tar inside will become brittle and break down, letting water in. The NOS ones wouldn't have much moisture issue since they have pristine tar, and they stay a fairly consistent temp not being used.

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Jul 13, 2016 at 10:17 PM Author: BlueHalide
Ahh that makes sense, whatever tar potting they used back in '48 must be different than what was used in the 70's and 80's as not one of these ballasts was leaking or ever leaked, every fixture housing/back of the reflector was perfectly clean. And even the used ballasts I brought home and tested that ran extremely hot showed no signs of tar dripping.
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Jul 13, 2016 at 10:32 PM Author: nicksfans
I've encountered leaking ballasts from about the same time period, so maybe it was just Sylvania.

I like my lamps thick, my ballasts heavy, and my fixtures tough.

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Jul 14, 2016 at 08:26 AM Author: streetlight98
Amazing!

Please check out my newly-updated website! McCann Lighting Company is where my street light collection is displayed in detail.

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Jul 18, 2016 at 09:50 AM Author: DieselNut
That is truly an awesome score! Looks totally identical to the several dozen Sylvania "HF100" fixtures I rescued and have in my shop. All of mine have chain hangers that go in the little side slots at each end, just before the housing widens at the tube socket mounts. These are among my favorite fixtures. Mine are not immaculate, but are in excellent condition, considering their age. They were in daily use when I swapped them out for 4x40 troffers for a customer, who paid me to do the job and gave me the old fixtures, most of which also still have their original ballasts.

Preheat Fluorescents forever!
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Jul 18, 2016 at 10:04 PM Author: BlueHalide
Yes these too look like they should have a hanging kit specifically for this fixture considering the hole locations. Also, there are a total of ten 3/4" knockouts for conduit and starter sockets, as you can see the three knockouts removed already contain a pre-wired starter socket. These fixtures can also accommodate 3 lamps as there are two more lampholder mounts and lampholder knockouts in the reflector not in use.
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jonathon.graves johng917 GeorgiaJohn
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Jul 19, 2016 at 08:13 AM Author: DieselNut
Yep, and has the mounting holes for the longer three tube ballast too. I have one with the painted steel reflector that I could convert to a 3 tube. I would not want to mess up the porcelain on the nice reflectors though.

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

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Jul 20, 2016 at 05:04 PM Author: BlueHalide
Nice, I packed these away in some bubblewrap, they are still up for grabs to whoever wants to drive out
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jonathon.graves johng917 GeorgiaJohn
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Jul 21, 2016 at 12:44 PM Author: DieselNut
How much would you want for them? Or is there anything you would want to trade? You can PM me if you'd prefer.

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

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