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141.239.172.248
Found this ad on flea bay. Overlord Nos Nib Match Pair 12ax7-HD ecc803s Ultimate 12ax7 Tubes GOLD Pins HIFI
COMBINING WESTERN ELECTRIC WITH NEW CRYSTAL TECHNOLOGY
I did not read the entire spiel but it sounds like a bucket load of wap which rhymes with .... People are actually bidding on this. Just put in "12ax7-hd" in the epay search.
Follow Ups:
A friend of mine just pointed this out to me:
http://www.ebay.com/itm/100-PIECES-5755-420A-NOS-NIB-TUBES-12AX7-ECC83-W-ADAPTER-WESTERN-ELECTRIC-/281539716137?hash=item418d132429
Same seller. Mystery solved.
I'm surprised the real deal hasn't butt in.
"I can't compete with the dead". (Buck W. 2010)
Hey, well worth $180.00 for a MATCHED pair.
My B.S. meter simply pegged; I think its ruined.
But I'm so dumbfounded, I can't put it into words.
This guy is truly a disgrace to our hobby.
I've been watching his deceit on eBay for awhile.
He even stole his screen name from an honest stand- up gentleman who's been around for years: C.E. Clutter, aka Radiola Guy.
Cory
manifest here.
Take a grip, it all happens, or fails, inside the envelope.
It's a Trump tube, see?
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
"This is a western electric tube with technology added to it
Making it ultra low noise
Thank you"
?????
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
And for his next trick, monkeys will fly out of his butt. Don't these donkeys know that the tube guys are perhaps the most avid and well informed collectors? cheers, Dak
Avid 12AU7 rollers among them.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Well, say a new person was browsing this site for example, with it's cable and tweak forums etc, then they browse the tube sections and see the high esteem some particular brands are held in.
They might then conclude that a "high definition" Western Electric AX7 wearing a beautiful Pakistani inspired necklace would be a match made in heaven.
One could say that it is a product of the environment, a product of opportunity.
Infamous sockpuppet
Well, not exactly a technical explanation but entertaining nonetheless. cheers, Dak
Think I saw the fancy toppers @ Jake's Back Room in the 70's, but they were jiggling so much I can't be certain.
Edits: 08/28/15
This stuff is too funny. I hope the person who buys the tubes will like them.
This may very well be a Russian 5751 with some plating on the pins, a socket wafer, some o-rings, and a piece of cosmetic metal jewelry glued to the top. (Which, if it's too rigid, may actually damage the tube long term)
Since everything is covered up by a sticker, nobody will really know without peeling one off.
The "Maximum balance differential voltage" specification is laughable, as this specification depends greatly on the circuit used, and it isn't hard to get better than 0.3V with a dissimilar triode like a 12DW7. I also like the 10,999 hour rating.
I'm kind of hoping this is an April Fools Day joke that hasn't been taken down.
You can see from the bottom that it was originally a 9 pin tube with some of the pins moved to different locations (pin two to pin three, and pin eight to pin six) and all the pins moved CCW slightly so they fall between the old pin locations. There may be some Russian tube that has similar specs. to a 12AX7 but a different base. Someone was very clever is coming up with this hybrid. I did a quick scan of all the 9 pin bases looking for a tube with pin 8 as plate #2 and pin 3 as grid #1 and couldn't find one. Maybe it is an obscure Russina or Chinese tube.
It just occurred to me that the 5755 is a similar to the 12ax7 with a amplification factor of 100. I checked the pin out and it is as you described. The use of the small PCB reassigns the pins to the ax7 pinout. Western Electric made some 5755 maybe he has a big stash?? But cynical me wonders if it could be the Raytheon 5755 which are quite cheap. It would explain the mumbo jumbo as way to confuse the buyer. Caveat Emptor, Dak
The 5755! That's the one I was trying to remember; it's not in my GE 'Essential Characteristics' tube manual which is why I didn't find the base listed. Yes, these were going for a dollar or so each in cases of a thousand, although now the price has risen some. The little adapter PC boards are even available on epay; the exact same ones used in these "12AX7-HD" tubes.
In the end though they are NOT a replacement for a 12AX7 since they have only 40% of the transconductance of a 12AX7 which is already a wimpy tube and almost twice the plate resistance. That means much more noise and much less ability to drive a following stage. I would steer well clear of these tubes for audio.
Has to be the 5755, likely Raytheon manufacture as said. I believe that most of the Western Electric manufactured 420A's were clear tops, actually all clear glass, appearing to not have a getter at all. IIRC, they used some sort of powder as getter material.
I know that W.E. subcontracted companies to manufacture their types, so technically, these could really be "W.E. tubes".
I have used the 420A in place of 12AX7's in a preamp (re-wired), and the sound was harmonically rich and initially pleasing, but not accurate. Likely, for the reasons you have stated. They sounded like a really fat Mullard or old RCA black plate 12AX7. It was a fun 'roll' anyway.
Not exactly what I'd call an "HD" 12AX7 sub, if anything, the exact opposite.
Cory
Seriously, I have a whole box of Raytheon 5755. I thought many times about using it in a circuit but never got around to it. I bought them a long time ago. And seriously if you want a 5 pack of Raytheon 5755 shoot me an email and we can work out a good price. cheers, Dak
If it is that special, why hide everything with stickers?Amplification factor in the 12ax7-hd specs says 78.
Was it a near equivalent with rewired pins with the pcb on the bottom. Pins look newly machined.
Edits: 08/27/15
I had the 720P 1080i version. They were nice.
These are the 1080p version. Much greater definition. I can see the music moving through my room, bouncing off surfaces, begin trapped, and instruments hanging in mid air!!!
I'm hoping they'll come out with a 4K Ultra HD.
The 3D versions sucked. Don't bother with them. Listening to music with silly looking glasses doesn't work well.
"I can't compete with the dead". (Buck W. 2010)
I guess their ad blurb is supposed to the appeal to the "new old school"? The gen who have recently discovered vacuum tubes but want to believe that modern science is superior to the science of 60+ years ago. They have yet to realize that the magic lies within the vacuum not on the outside. Dak
I'm buying several to roll into my Samsung Tube Audio Soundbar.
"I can't compete with the dead". (Buck W. 2010)
I would they'd make a 6922 for my tubed motherboard...
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
May your tubes be warm, long-lasting, and always lively. Holy be thy heater.
Yep I seen it about 2 months ago. I thought it one of the more ridiculous things I had ever seen about tubes and in general. The jewelry caps are a faraday cage or silly craft store items Hummph? Well it is said one is born every second in this country.
I don't think you can get away with strapping the pins or is that just silly plastic, HHummph?
Steve
Agreed. I can't find any information regarding Overlord as a manufacturer, nor their activities in the US.
This is the only photo that I have found that could offer some information about the internals beyond the stupid sticker.
-We see what should be a halo getter and a copper support rod
-The mica has teeth and is not the squared-off type we see with some New Sensor and Chinese-sourced tubes.
-We're probably looking at a smaller to average sized plate structure
-The colour of the mica tells me it's not later North American stock, but the plates are too short for early stock...
Actually, I think I found it. I think it's a ARBI Raytheon 12AX7. I have a sample. One moment...
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
May your tubes be warm, long-lasting, and always lively. Holy be thy heater.
On second thought, it may have been a false alarm. The grid rods are different lengths, the getter seems a little different between the copper rod and the halo. Different color for the flashing... And I just noticed this Overlord tube seems to have nickel plating exposed on the plate crimps at the mica.
But! At least the mica design is pretty bang on.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
May your tubes be warm, long-lasting, and always lively. Holy be thy heater.
More and more, I'm between two camps. One part of me think it's a Japanese tube that's been futzed. I looked through the rest of my Japanese stock (non-Philips, so Hitachi-Raytheon stuff). All have the toothed mica, but some batches have the squared-off fitting on top, and older ones have a full round top fitting. Also, it seems the use of copper rods were used for certain batches, as well as larger or smaller getter rings.
Another possibility is that they're a Philips design of sorts...
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May your tubes be warm, long-lasting, and always lively. Holy be thy heater.
First I've heard of these.
There is a short video on YouTube.
Here's the link.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
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