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For 6AS7G tube rollers here ..... - Page 86

post #1276 of 3807
By the logo on the base of the tube biggrin.gif

There aren't major physical differences in most of the us 6AS7Gs. Grey plate/black plate, bottom shield or not, bottom or top getter...all of the makers seemed to make every variant. But this was a very common tube, so it's pretty reasonable to assume Sylvania, RCA, and Raytheon, who were all massive tube manufacturers in the day, were making their own, and not rebranding.
post #1277 of 3807

At least the guy sent me nice one.Thanks!

post #1278 of 3807

The GTC 6AS7 is coming in this week that is the one i'am excited about because it's a unknown brand hopefully it's a nice one.

post #1279 of 3807

I've asked the vendor if the tube he sent me is a rebranded and he said it's just a mistake putting the RCA in the RAYTHEON Box.

post #1280 of 3807
Quote:
Originally Posted by Skylab View Post

By the logo on the base of the tube biggrin.gif

 

You do, of course, realize that the brand means practically nothing as to who made the tube.

 

Yes, Raytheon made tubes. No, no manufacturer made all the types.

 

Did Raytheon actually make 6AS7Gs? (This is a serious question because I don't know.)

post #1281 of 3807
Quote:
Originally Posted by Oskari View Post

You do, of course, realize that the brand means practically nothing as to who made the tube.

Yes, Raytheon made tubes. No, no manufacturer made all the types.

Did Raytheon actually make 6AS7Gs? (This is a serious question because I don't know.)

Yes of course I'm well aware of that tongue.gif

Again, 99% sure they did. Do I have certain proof? Nope. But I think my reasoning is pretty sound. Unfortunately I no longer have any of the Raytheon 6AS7Gs I had but IIRC they did have some very subtle differences with the RCAs and the Sylvanias. I still own about a dozen Sylvanias. I only kept them and the Tung-Sol/Chathams from my crazed 6AS7 days...
post #1282 of 3807

Fair enough. I knew you'd be aware of that. I was, sort of, trying to preempt any noob hang-ups. ;)

 

If there happens to be anybody out there with superior knowledge, please speak up.

post #1283 of 3807
Quote:
Originally Posted by i luvmusic 2 View Post
 

The GTC 6AS7 is coming in this week that is the one i'am excited about because it's a unknown brand hopefully it's a nice one.

 

That is interesting especially if there is a box with information about GTC. Obviously GTC was a rebrander. But who were they and where?

post #1284 of 3807
Quote:
Originally Posted by Oskari View Post

Fair enough. I knew you'd be aware of that. I was, sort of, trying to preempt any noob hang-ups. wink.gif

If there happens to be anybody out there with superior knowledge, please speak up.

Indeed, it would be interesting to know definitively one way or another.
post #1285 of 3807
Quote:
Originally Posted by Skylab View Post


 I still own about a dozen Sylvanias. I only kept them and the Tung-Sol/Chathams from my crazed 6AS7 days...

Didn't keep any WE 421A's ? Can you describe diff in sound between Syl vs TS please ?

post #1286 of 3807

FWIW, I've found that comparisons between different brands of the same basic tube such as a 6AS7G -to me- are only relevant if you compare them in the same or very comparable amp.  The longer I'm indulging in this tubular madness, the more I've come to see that differences in amp topology and the loadline that was selected for the tube in question (Ep, Eg....) play a far greater role as these tend to have an influence not only on the power available but also on the nature of the harmonic distortion and fraction of 2nd/3rd harmonics etc.  Not even talking about wether or not you'll be using an output transformer or not etc etc.  If you want to go all out you'd almost have to build a setup on a bread board, then play around with different loads and see how it translates sound wise.  Or maybe I'm going gaga and should stop reading about this stuff, that's always another possibility.

 

Before I know it I'll own as many power and output transformers as tubes.  Truly, there's no limit to this madness....

post #1287 of 3807

True but certain general characteristics never change , for example the TS 5998 / 7236 always gives good bass in all amps I have tried them on.

post #1288 of 3807
Quote:
Originally Posted by Xenophon View Post
 

FWIW, I've found that comparisons between different brands of the same basic tube such as a 6AS7G -to me- are only relevant if you compare them in the same or very comparable amp.  The longer I'm indulging in this tubular madness, the more I've come to see that differences in amp topology and the loadline that was selected for the tube in question (Ep, Eg....) play a far greater role as these tend to have an influence not only on the power available but also on the nature of the harmonic distortion and fraction of 2nd/3rd harmonics etc.  Not even talking about wether or not you'll be using an output transformer or not etc etc.  If you want to go all out you'd almost have to build a setup on a bread board, then play around with different loads and see how it translates sound wise.  Or maybe I'm going gaga and should stop reading about this stuff, that's always another possibility.

 

Before I know it I'll own as many power and output transformers as tubes.  Truly, there's no limit to this madness....

 

Switchable loads is something a few BH Crack users have been trying out recently for the input tubes a few extra resistors and a three way switch on the speedball  (c4s) and its possible to run the 12au7 substitutes 12bh7 & E80cc  tubes much more optimally. The improvement sonically a few extra volts more or less can make is quiet a noticeable in conjunction with the 6080/6as7g driver

post #1289 of 3807
Bipolar hypo manic episode + Tube addiction = big problem

Don't ask me how I know. frown.gif
post #1290 of 3807
Quote:
Originally Posted by MoatsArt View Post

Bipolar hypo manic episode + Tube addiction = big problem

Don't ask me how I know. frown.gif

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


Edited by punit - 6/3/14 at 1:37am
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