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For 6AS7G tube rollers here ..... - Page 87

post #1291 of 3813
Ha..!

I have listed probably a third of what I have bought in the space of a few weeks.

Perhaps we should form "Tube Addicts Anonymous". Wait, you already know my name. Rats. Maybe Tube Addicts Pseudononymous?

The acronym would be "TAP". Hmm... taps are for drips, so I would fit right in.
post #1292 of 3813

I can guarantee that Raytheon did in fact make their own 6AS7G.  However, I have seen some sellers on eBay trying to pass off Soviet tubes as "Ratheon" tubes.  Gotta be careful out there.

post #1293 of 3813
Quote:
Originally Posted by punit View Post
 

Bipolar or not , Tube addition is a problem. I don't have bipolar but based on the tubes that you have listed for sale (which you mentioned you have purchased even though you didn't need it), I have a bigger problem than you. If I list the tubes that I have purchased (but really don't absolutely need) for sale, it will be at least 3 times your list.:o

 

Everyone should collect something :)

post #1294 of 3813
Quote:
Originally Posted by Skylab View Post

Indeed, it would be interesting to know definitively one way or another.

 

And I too would very much like to see more information on this matter. Personally, I am still rather skeptical that Sylvania, Westinghouse, Raytheon, and perhaps others, manufactured 6AS7's that appear to be identical to RCA. In every other case that I am aware of, which includes a boatload of pentodes and heptodes, as well as double triodes, if a manufacturer devoted the necessary time and resources to produce their own version of a tube, the result was a unique and different product. They would not simply copy another manufacturer's design right down to using the exact same parts.

 

The exception would be if Sylvania and the others simply licensed RCA technology to build these. After all, RCA was the original developer of this tube. But this kind of technology-licensing appears to have been much more common with second and third tier manufactures located outside of the US, not biggies like Sylvania.  And one could conjecture that it was more cost-effective to simply purchase and rebrand RCA-made tubes, than to build an assembly line to produce RCA knockoffs, much less their own unique design.

 

But who knows? Maybe Sylvania, Westinghouse and Ratheon actually did license the technology from RCA, sourced all the components from RCA, and then built them in their own factories. And this might explain the subtle differences people hear as they would have been manufactured in different factories.....

 

Again, I certainly don't know... I'm just throwing this out there... 

 

Cheers

post #1295 of 3813

Interestingly, these seem to exist

 

JAN-CRC-6AS7G (RCA)

JAN-CG-6AS7G (GE)

JAN-CAHG-6AS7G (Chatham)

 

but the following don't seem to exist

 

JAN-CHS-6AS7G (Sylvania)

JAN-CRP-6AS7G (Raytheon)

JAN-CWL-6AS7G (Westinghouse)

 

I don't know how significant that is.

post #1296 of 3813
Quote:
Originally Posted by hodgjy View Post
 

I can guarantee that Raytheon did in fact make their own 6AS7G.  However, I have seen some sellers on eBay trying to pass off Soviet tubes as "Ratheon" tubes.  Gotta be careful out there.

Yeah i saw some of those luckily i have some 6H13C and those raytheon wanna be looks exactly like the 6H13C that have the bottom saucer thingy. 

post #1297 of 3813

If you want to know about cross-licensing deals involving just RCA, take a look at this:

 

http://www.library.hbs.edu/hc/lehman/company.html?company=rca_corporation

 

My guess is it was a tangled mess in the end, a quick liik at the US Patent's office records shows quite a number of patents and -even back then-lawsuits.

post #1298 of 3813
Quote:
Originally Posted by Oskari View Post

Interestingly, these seem to exist

JAN-CRC-6AS7G (RCA)
JAN-CG-6AS7G (GE)
JAN-CAHG-6AS7G (Chatham)

but the following don't seem to exist

JAN-CHS-6AS7G (Sylvania)
JAN-CRP-6AS7G (Raytheon)
JAN-CWL-6AS7G (Westinghouse)

I don't know how significant that is.

Well it shows who won the military contracts!!! biggrin.gif

The 6AS7G was a post WWII tube. So military production would have been by contract award, not by government edict.
post #1299 of 3813

My Raytheon commercial version have the same construction as the JAN CRC ones.

post #1300 of 3813

Does anyone know when the Chatham No. 3002399 / 5998 were manufactured? I have never seen a date on one of these.....

post #1301 of 3813

I have a couple JAN-CRC-6AS7G (RCA) coming in tomorrow to pair with my La Figaro 339 and RCA Red Hots (5693). Looking for something a little different than my Chatham/Tung Sol 5998s just for comparison sake. IF I prefer them with my HE500, I'll let you guys know and put them up for sale (Chathams).

post #1302 of 3813

In this hobby it's all a matter of taste but owning all the tubes you mentioned, it would surprise me if you'd prefer the RCA's over the 5998.  If you like something different, give the 7236 a spin (very related to 5998 but cheaper and a bit tighter/clearer imo) or the graphite plate/column 6080WB which is actually the only 6080 I prefer to some of my 6AS7G tubes.  I just purchased a pair of 6528 from a member, would like to test them with my 337 but the heater draws 5A.....read some posts indicating that it should work (more than once before blown up my amp, that is) but still a bit hesitant, it's double the current of any other tube I use (and a mu of 9 so very high gain).

 

Curiosity killed the amp....I'll make sure I have a full stock of the innards on hand and hook up some meters if/when flipping the switch.  In case any kamikaze pilots have tried this with a 337, let me know...

post #1303 of 3813
Quote:
Originally Posted by Xenophon View Post
 

In this hobby it's all a matter of taste but owning all the tubes you mentioned, it would surprise me if you'd prefer the RCA's over the 5998.

 

Well, I do...

post #1304 of 3813
Quote:
Originally Posted by Oskari View Post
 

 

Well, I do...

 

It doesn't surprise me when people say they prefer something like the RCA or anything else over the 5998 or even the 421a.  Often, I'm in that same boat.  This is all very much akin to saying someone should like Italian food over Japanese food.

post #1305 of 3813

 So far... The RCA doesn't have the volume the 5998 has or the bass (extension/tightness), but it's overall smoother. Give and take. I plan to get the HD650 and HE560 pretty soon so I'll keep both the RCAs and 5998s and see how they play with those. I still don't have my Enigmas yet, but I think the RCAs will probably work really well with them. Overall, I'm happy with the RCA's. Probably will get a lot better with some hours on them.

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