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For 6AS7G tube rollers here ..... - Page 93

post #1381 of 3825
Quote:
Originally Posted by kazsud View Post
 
Quote:
Originally Posted by Ultrainferno View Post

Have you read anything at all? wink.gif

 

Most of the java related button on my browser at work don't do anything at all when clicked. Especially the search this thread button :/

 

Maybe this will help?

 

http://www.head-fi.org/newsearch/?search=SVETLANA&resultSortingPreference=recency&byuser=&output=posts&sdate=0&newer=1&type=all&containingthread%5B0%5D=410326&advanced=1

post #1382 of 3825
Thank you!
post #1383 of 3825
Quote:
Originally Posted by Xenophon View Post

things went south with the shift to Japan in the 1970-1980's and eventually the name disappeared.

 

Asian competition certainly left its mark, but that's only half the story. The name Valvo disappeared, like many other local Philips brands, because Philips retired them and wanted to make Philips a global brand.

 

The Valvo, later Philips, CRT plant in Aachen, for example, survived much longer than what you suggest. At some point, this was the biggest producer of colour CRTs in Europe.

 

The Valvo tube plant in Hamburg was a bit of a specialist. They made special versions like E81CC/6021s but often were an early adapter to new types like ECC40 or E80CC.

 

They were also an early producer of semiconductors. This legacy still lives on in Hamburg under the name NXP.

 

Quote:
Nice 6080 but nothing really special about it imho.

 

What exactly are you referring to? As far as I know, Valvo never made a 6080. They certainly branded Mullard 6080s, and apparently GECs, too.

post #1384 of 3825
We're not writing a detailed history of everything that was ever served in the company restaurant here.....I know full well that some parts lasted until deep in the 90's but that's irrelevant to their tube business. As to which 6080 I mean, those sold under the Valvo brand, obviously, read what I write, don't guess what I might think. Regardless if they were identical to Mullard or a host of others...they're to my ears run off the mill 6080's and apart from a couple of exceptions I'm not a big fan of that tube.
post #1385 of 3825

Its quiet easily possible for three or four people to be referring to a particular make of tube say a Mullard 6080 or what ever and they all could be talking about different tubes even though branded the same, plate structures, getters, chemical compositions can vary and all will have a unique individual sonic characters with dates of manufacturing spread over 50-60 years which can make for plenty of debate if its not clear on what specific tube everyone is talking about.

post #1386 of 3825
Quote:
Originally Posted by JamieMcC View Post
 

Its quiet easily possible for three or four people to be referring to a particular make of tube say a Mullard 6080 or what ever and they all could be talking about different tubes even though branded the same, plate structures, getters, chemical compositions can vary and all will have a unique individual sonic characters with dates of manufacturing spread over 50-60 years which can make for plenty of debate if its not clear on what specific tube everyone is talking about.

Well, everyone believes what he/she wants obviously.  But my religion is that differences in amplifier topology (feedback/no feedback....), driver tubes used, different operating point of the tubes and the resulting load line , variations in output transformers....will have a seriously higher impact.

 

For instance according to a Tubecad simulation (found by many builders to be pretty much on the mark) for a triode-strapped KT88 you can get a second harmonics component (no feedback used) ranging from <2% to >10%, depending on the voltage, bias point, impedance match with the output transfo...  I mention that tube because I'm modelling with it now but the point is:  these factors are imo much more audible than small variations based on the age of the tubes etc.  

 

But as I said, it's more of an art/religion than science at this point, it would take some double blind testing and I'm not the proselytising type.

post #1387 of 3825
Quote:
Originally Posted by Oskari View Post
 

They made special versions like E81CC/6021s

 

Oops, that's 6201.

 

Quote:
Originally Posted by Xenophon View Post

As to which 6080 I mean, those sold under the Valvo brand, obviously, read what I write, don't guess what I might think.

 

That's not very useful then, is it?

post #1388 of 3825

Comparing a Mullard 6080 to a Mullard KT88 considering the price differences

Quote:
Originally Posted by Xenophon View Post
 

Well, everyone believes what he/she wants obviously.  But my religion is that differences in amplifier topology (feedback/no feedback....), driver tubes used, different operating point of the tubes and the resulting load line , variations in output transformers....will have a seriously higher impact.

 

Interesting and I am not disputing the above as I know it is correct from my own build experience.

 

One of the things I find interesting about the Valvo/Mov/GEC 6080 is that it is was manufactured in the same factory using the same plate structure as the highly regarded GEC 6AS7G which is sonically on a whole different level to its 6080 version. The two plate structures look/are identical except for the getters. 

 

As this is a bb about  6as7g/6080 tubes in particular, observations, characteristics and discussion about this tube type are kind of what you should expect to see here.


Edited by JamieMcC - 6/14/14 at 1:30am
post #1389 of 3825
Quote:
Originally Posted by JamieMcC View Post
 

Comparing a Mullard 6080 to a Mullard KT88 considering the price differences

 

Interesting and I am not disputing the above as I know it is correct from my own build experience.

 

One of the things I find interesting about the Valvo/Mov/GEC 6080 is that it is was manufactured in the same factory using the same plate structure as the highly regarded GEC 6AS7G which is sonically on a whole different level to its 6080 version. The two plate structures look/are identical except for the getters. 

 

As this is a bb about  6as7g/6080 tubes in particular, observations, characteristics and discussion about this tube type are kind of what you should expect to see here.

 

You're right of course, apologies.

 

Just wanted to point out that many other variables come into play, when I started out I was of the opinion that the tubes were the decisive factor, have learned a couple of things since then.

post #1390 of 3825
Quote:
Originally Posted by Xenophon View Post

 

Just wanted to point out that many other variables come into play, when I started out I was of the opinion that the tubes were the decisive factor, have learned a couple of things since then.

 

Totally agree its relatively easy to voice amplifier a certain way to fit with personal listening preferences its a big part of the attraction of building a amp yourself!

 

How are you liking Tubecad out of interest?

post #1391 of 3825

It's absolutely a great program, takes some getting used to  but saves a lot of time poring over graphs, downloading spec sheets and calculating stuff. Very useful with the different modules.   Not to mention cash savings due to preventing me from blowing stuff to kingdom come.  I have one single box in my house that still runs XP and tube cad and its brethren are the sole reason for that.  My main system is a Mac, I've got parallels running on it but even with an XP emulation-->no joy.  Anyway, if the simulation says it won't work then I don't go there.  The other way around is not always a sure win but a lot better than explaining to my wife why I need a collection of umpteen tubes, a variac, 20 output transformers and interstages and more other gear than I can shake a stick at.  I'd recommend it to anyone who has an interest in experimenting with tube amplifier builds.

 

I got to know it by sheer coincidence after browsing on diyaudio and purchasing the tubelab SE board for a project, George also uses the software extensively and is a great guy (he does like pushing things over the edge though, I'd hate having to pay his fire insurance cover).  Anyway, one thing led to another.....

post #1392 of 3825

Hi,

   Anyone know who made this IBM 6AS7G?

Bendix 6080 is this the graphite plates? THANKS!

SYLVANIA 6AS7G Made in England Made by?


Edited by i luvmusic 2 - 6/20/14 at 4:38pm
post #1393 of 3825

IBM is by Tung-Sol prob 5998

Yes they are Bendix 6080 WB with slotted graphite plates

Prob Mullard or Brimar but could be Russian

post #1394 of 3825
Quote:
Originally Posted by Dogmatrix View Post
 

IBM is by Tung-Sol prob 5998

Yes they are Bendix 6080 WB with slotted graphite plates

Prob Mullard or Brimar but could be Russian

Thank you! So the sylvania if it's russian i don't need it i have 2 winged C. 

post #1395 of 3825

It is hard to tell from that angle the getters are the giveaway Mullard or Brimar will have round or square hoops Russian will have little flying saucer cups

Also the Bendix look like two slightly different plate types both graphite but one slotted the other may be solid type, may be concern if you need a close match

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