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What a bunch of crap! Another problem created where none before existed.
The you tube poster as a technician would rightly be concerned about filament flare up on power up. And perhaps, he has less experience with vintage tubes than some of the grizzled veterans lurking at this site. Afterall, he did lump the Telefunken brand in with the Amperex group and we all know that Teles don't flare unless truly defective. I have tested literally thousands of tubes and can certainly attest that the flare up phenomenon seems to have no effect on performance and the fact that all those vintage Mullard and Amperex signal tubes are still working after 60 plus years does cast doubt on his conclusions or assumption of a defect problem. Perhaps, tooting his horn to some extent? Anyway, the major take away from all of this is .... DON'T TRUST WHAT YOU SEE ONLINE!
cheers, Dak
Edits: 04/05/16
I'm sorry, but...If this is true how come we don't have piles of dead ECC series Bugle Boys lying around our benches? I have NEVER had a "flasher" fail due to an open heater. NEVER. And a lot of them passed through here over the years.
It's amazing that all the engineering types at Philips' Amperex division didn't know how to design a tube heater - but he does. For him to say this is "how a tube heater is supposed to work" or such is awfully presumptuous to say the least. I guess he's never seen a 2E26 fire up!
And he couldn't find hardly any discussions of this in any of the forums? This is one of the most popular topics in almost any tube forum because people new to tubes don't realize the flash is normal and harmless in these small tubes so they are asking about it all the time..
Sorry, I call B.S.
And did anyone catch that he used to "reverse engineer" other manufacturers stuff?
"Dirty Little Secrets" ? Sure...
Edits: 04/04/16
Do a lot of Philips/Mullard/Valvo tube flash because of construction differences, compared to US made tubes? Or composite of the heater filament?
And is this mostly an issue with 9-pin miniature tubes. Not octal or 9-pin output tubes, like the EL84?
Thanks!
The Philips family tubes (and companies that used Philips machinery/parts later such as Ei) are the ones that use the high inrush current heaters. There are others like (IIRC) the 2E26 that flash at startup because they are designed to warm VERY quickly.
I can only recall seeing this on the Philips miniatures.
You're just jealous of all that cool looking equipment that guy has.
If I had all that testing equipment I'm pretty sure my house would have burnt down by now.
If you take note most of it pretty old too. I suspect, as Jim alludes to that it's there for show. Or maybe he's a collector and that's his storage cabinet.
Edits: 04/08/16 04/08/16
I'd be willing to place a bet that says most of that gear never gets used. I have the same thing occur here. I don't have as much test gear as shown in that picture he posted, but even with less gear I end up using the same relatively few pieces a lot - while the rest just sits. I bought one of the real nice refurbished Keithley units that Parts Express had late last year, really nice units - and I haven't even opened the box yet!
I have an American 12AU7 that I believe is Sylvania that flashes. Strangest thing.
I have also run across an occasional brand that also flashes. I had one Russian tube do that but perhaps, those tubes are actually defective or about to experience a short. Maybe, it is wiser to let that one sit on the sideline? regards, dak
Jim, I saw the video. The section that flashed did so only from what appeared to be an undersized section of wire. IMO, that specific specimen was poorly manufactured.The famous (notorious?) Philips flash is more or less uniform, not concentrated in just a small area. The tale I've "heard" is that Philips engineered the behavior to mate their tubes well to directly heated rectifiers, like the 5U4. The idea being to get emission going quickly.
With all respect to Mr. Carlson who does some FINE work, the flash is associated with plants that Philips owned, including Mullard. A tube made in a TFK plant does not flash. Folks, please keep in mind what matters is the plant where a tube was made, not the printed label on the envelope's outside or the cardboard box. Cross labeling was always a fact of life. Can anybody show me a Loctal tube made in a plant other than Sylvania's Emporium, PA, facility?
Eli D.
Edits: 04/04/16
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