Schiit Lyr Tube Rollers

[satwilson]

Just got my Lyr a couple weeks ago. Got some tubes from mercedesman, RCA Red Globe/Amperex 6DJ8 ECC88, 1974, grey plate, "0" getter, gm all above 110%, $50.00. I love them, my question? Are these basically rebranded GE/Amperex 74 OG? Thanks, satwilson

 

[gibosi]

  Just got my Lyr a couple weeks ago. Got some tubes from mercedesman, RCA Red Globe/Amperex 6DJ8 ECC88, 1974, grey plate, "0" getter, gm all above 110%, $50.00. I love them, my question? Are these basically rebranded GE/Amperex 74 OG? Thanks, satwilson

 
The "brand" tells you nothing......  
 
The only way to know for sure is to compare the Philips production codes etched into the tubes. These codes precisely specify the factory and the date of manufacture for each and every tube produced by any of the Philips' subsidiary companies.
 
So if both the RCA and the GE tubes were manufactured in the same Heerlen, Holland, factory at about the same time in 1974, then one can reasonably conclude they are virtually identical.
 
http://tubedata.milbert.com/other/Philips/PhilipsCodeListAB-v10.pdf

 

[satwilson]

I assume mercedesman is reputable. I assume his assertion Heerleen is also. Guess I should have posted the link? Anyway , they sound great after 20 hrs. Do you have an answer to my question? 

 

[Oskari]

They are all rebranded Philips tubes (if made in Heerlen). 

 

 

[gibosi]

  I assume mercedesman is reputable. I assume his assertion Heerleen is also. Guess I should have posted the link? Anyway , they sound great after 20 hrs. Do you have an answer to my question? 

 
As I do not know the Philips codes for these tubes, there is no way I can answer your question. Again, if both were manufactured in the same factory at about the same time, then they are virtually identical. If they were manufactured in different factories then they are different.
 
As Oskari points out, Heerlen tubes were often rebranded. And therefore, the "brand" on the tube, whether GE or RCA or whatever, is of no use in answering your question.

 

[Oskari]

 
if both were manufactured in the same factory at about the same time, then they are virtually identical.

 
This also holds.

 

[satwilson]

   
The "brand" tells you nothing......  
 
The only way to know for sure is to compare the Philips production codes etched into the tubes. These codes precisely specify the factory and the date of manufacture for each and every tube produced by any of the Philips' subsidiary companies.
 
So if both the RCA and the GE tubes were manufactured in the same Heerlen, Holland, factory at about the same time in 1974, then one can reasonably conclude they are virtually identical.
 
http://tubedata.milbert.com/other/Philips/PhilipsCodeListAB-v10.pdf

I understand the BRAND thing. These are still available from mercedesman, he is a trusted seller, once again I will say....I don't need all the caveats, please answer the question anybody?

 

[gibosi]

  I understand the BRAND thing. These are still available from mercedesman, he is a trusted seller, once again I will say....I don't need all the caveats, please answer the question anybody?

 
It is impossible to answer your question with any degree of certainty given the information you provide....
 
I have an Amperex OG manufactured in the Blackburn, England, factory. And I have another Amperex OG manufactured in the Heerlen, Holland, factory. And guess what? The are different.....
 
If you trust mercedesman, go for it. But personally, unless a vendor is willing to provide the Philips production codes, so that I can be certain that I will get exactly what I want, I will pass every time....
 
Cheers

 

[ThurstonX]

  I understand the BRAND thing. These are still available from mercedesman, he is a trusted seller, once again I will say....I don't need all the caveats, please answer the question anybody?

 
I think the problem is we don't have enough details.  Things you need to answer your question are construction details (close up pix will show those) and any codes (not brand names) printed or stamped on the tubes.  For example, if they are from the Heerlen factory, there should be a "delta" triangle followed by two more characters (numerals and/or letters).  The "delta" triangle will be a right triangle (90 degrees lower right), with the hypotenuse from top right to lower left.  It's hard to print that symbol in here, but it exists in Windows Character Map for some fonts.
 
Here's an example from a tube list I made for my collection:
 
◿6K5
    seems to mean:
                  ◿ : Made in Heerlen
        6 : in 1966
        K : in November
        5 : in the fifth week(? or 5th batch?; 5th week is possible)
 
So, without details like that, I don't think you will find an answer to your question.  Yes, mercedesman is a trustworthy vendor, and the tubes I've bought from him are as described in the item listing.
 
HTH.

 

[satwilson]

I knew I would get this response, if any of you would like to assume you know more than the the seller of these tubes, I have only provided the details he gave me. That being said: The tube rolling thread is actually not only for those of you who have unlimited resources to explore all the nuances of the Lyr, but for the rest of us who only wan't to upgrade from the stock tubes. I have found the ridges on the top, etc. I only asked a simple question. The minutia you ask for is inherent to the reputation of mercedesman. It was a simple question, ANYBODY?

 

[jaywillin]

I knew I would get this response, if any of you would like to assume you know more than the the seller of these tubes, I have only provided the details he gave me. That being said: The tube rolling thread is actually not only for those of you who have unlimited resources to explore all the nuances of the Lyr, but for the rest of us who only wan't to upgrade from the stock tubes. I have found the ridges on the top, etc. I only asked a simple question. The minutia you ask for is inherent to the reputation of mercedesman. It was a simple question, ANYBODY?

I believe the answer, based on the information given, would be"who knows?" Or "it depends" if you aren't satisfied with that, my suggestion would be ask Mercedesman, I've bought tubes from him, and asked a lot of questions, he responds pretty quickly, and he knows the tubes he sells

 

[Oskari]

  It was a simple question, ANYBODY?

 
You may think so, but it wasn't. 

 
At this point you might want to rephrase the question.

 

[kvtaco17]

  I knew I would get this response, if any of you would like to assume you know more than the the seller of these tubes, I have only provided the details he gave me. That being said: The tube rolling thread is actually not only for those of you who have unlimited resources to explore all the nuances of the Lyr, but for the rest of us who only wan't to upgrade from the stock tubes. I have found the ridges on the top, etc. I only asked a simple question. The minutia you ask for is inherent to the reputation of mercedesman. It was a simple question, ANYBODY?

Broski, chill!
 
Post a few pics of the tubes showing the markings and the plate construction and we should be able to help you. Without that info all we can do is guess...

 

[Solrighal]

Hi folks. I just bought a pair of HD 650's and I'm looking to buy a valve amp to sit alongside my O2. The consensus seems to suggest the Lyr works well with the Senn's but certain tubes are better than others. Could anyone here enlighten me as to what changes I'm likely to hear compared to my O2? I'm feeding it from an ODAC.

 

[gibosi]

Hi folks. I just bought a pair of HD 650's and I'm looking to buy a valve amp to sit alongside my O2. The consensus seems to suggest the Lyr works well with the Senn's but certain tubes are better than others. Could anyone here enlighten me as to what changes I'm likely to hear compared to my O2? I'm feeding it from an ODAC.

 
Everyone's ears are different. What one person likes another doesn't, even with the same headphones and amp.
 
I would suggest you take a look at this website maintained by Brent Jessee to get an idea of the sonic signature of the various 6DJ8-type tubes. I have never purchased from this company but the feedback I have read is mostly positive.
 
http://www.audiotubes.com/6dj8.htm
 
And another very interesting take on these tubes:
 
http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html#6DJ8