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Are these really Raytheon tubes?
Here are some pictures of the "Raytheon". Perhaps they will help better to identify them.
Thanks for all your help.
I currently own 3 pairs,2 horseshoe getter and 1 pair round getter like the pics.The rounded nub at the top of the glass,angled getter support and plate structure look legit.The only difference I can spot is all my tubes have 2 flat sides on the lower mica,but that may not mean much.All the tubes I have are labeled"Admiral by Raytheon" with Raytheon manufacturing code of 280 printed on the glass.
So I guess I cant say for sure,but someone else may be more knowlegable.
Look for Admiral label. Most or all are Raytheon USA manufacture with EIA code 280. An alternate is Dumont label. Not sure what they are, but very close to the Raytheon USA sound.
I must say I agree.I currently own 3 pairs Raytheon's that are labeled Admiral.One of my favs along with both grey and black plate Tung-sols.
that star on that one looks like an NEC and they also made tubes for channel master..Unless they are black plates I wouldnt use those..Do you plan on using them in the mac I just rebuilt for you?
No matter how stir the pot,you only get out as good as what goes in.Power supplies matter most.
They are for the Mac you rebuilt. I've read great things about the Raytheon so thought I'd try to buy a pair at a reasonable price. These ended up being probably too reasonable to be real which is why I posted the question of authenticity. I'll try to get a better picture once I get them.
The tubes shown in the Asylum classified listing picture are CBS, with the type etched on the enveloped and a dot pattern like GE used, black raised center rib style plates, and filament and plate shields. Tung Sol made a tube that LOOKED just like this tube, but had Tung Sol markings. It looks so similar to the CBS, and both were made around the same time. Maybe there was some component or design licensing or sharing between Tung Sol and CBS? Tung Sol made a 6CG7 that looked identical to these black plate tubes, but with gray plates (I don't see any indication that these had a CBS connection). There're also some cool-looking 3-mica black and gray plate tubes using this raised center rib plate style, but this getting further off-story...
Back to the tubes in question, I can't tell definitively from the eBay listing picture whether these are Raytheon-made 6CG7s. All the Raytheon-made 6CG7s had black, flat, ladder type plates, which are very different from the tubes pictured in the Raytheon-actually-CBS 6CG7 Asylum classified ad. The Raytheon tubes have a plate shield, but don't have filament shields. They can be O- or D-getter ring styles, with the wire supporting the getter ring canted at an angle. The eBay listing tubes have the short-finished tips that are typical of Raytheon-made small/signal tubes. What's the branding on the eBay tubes. I've seen it many times before, but I don't recall what it is at the moment. I don't remember seeing third-party branded Raytheon-made tubes.
The silkscreening is as follows:
except the '6' is over the 'G', and the dots are under the 'G'.
I thought these were Raytheons, based on photos I saw on the internet, but I can't remember where. They probably are CBS or Tung-Sol, as you say.
I took another close-up photo, and posted it in the classified ad.
That style etching with the dots denotes GE.I have several pairs of CBS labeled GE's and I can't tell them apart from genuine Tung-sols,the plate structure and center shield are exactly the same.These are the only tubes with this type of plate,would be interested in finding out why this is.
and maybe we can figure out where they were made.
but were likely NEC's or Hitachis
I read 'Made in USA' and that is a good sign. Real USA Raytheon have a center shield. Look for EIA code 280 on the glass.
I'm no expert, but the only Raytheon 6Cg7s I own, and have seen, are either the ones with the shield around the name, or the ones with the font that grows larger to the "TH" then smaller, forming a peak in the lettering. That latter sytle are the black plates I own...and I love their sound.
I'm familiar with the ascending and descending lettering to and from the TH. That's why I was wondering about these. The reason I ask is because I just got these on ebay.
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