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For 6AS7G tube rollers here ..... - Page 168

post #2506 of 2511
Quote:
Originally Posted by bocosb View Post

I got a Mullard 6080 from Langrex, it's marked cv2984 from 1975, is there a better version to get or is this as good as it gets? I didnt had the chance to listen to it since it arrived when i was leaving town

 

 Those are great sounding tubes I have 4 sets, there some of the best 6080's if not the best a very very close second would be early tung sol / chatham 6080's..

post #2507 of 2511
Quote:
Originally Posted by TonyNewman View Post
 

 

I think there must have been some re-branding happening with C3Gs as I have a stripped Lorenz and a stripped Siemens - they are utterly indistinguishable on the internals. One set has a slight flattening of the glass on the top - apart from that they are entirely the same.

 

Despite gibosi's pertinent point, I just had to chime in here...eventually - sorry!

 

Having begun the C3g craze a long while ago now on the LittleDot Tube Rolling Guide Thread, I personally found the slightly flattened top to always belong to the Siemens 'S' tube, but of course nothing is 100% cut and dried in this tube game, is it?!

post #2508 of 2511
Quote:
Originally Posted by gibosi View Post
 

AJ1 R0K3 = the third week of November, 1970. (The week digit was not used until after 1961, so not 1960.)

 

I would certainly agree. But. That SB date. Feb 61. It disagrees. This must be a late 1960 Mitcham tube with a week digit!

post #2509 of 2511
Quote:
Originally Posted by hypnos1 View Post
 

 

Despite gibosi's pertinent point, I just had to chime in here...eventually - sorry!

 

Having begun the C3g craze a long while ago now on the LittleDot Tube Rolling Guide Thread, I personally found the slightly flattened top to always belong to the Siemens 'S' tube, but of course nothing is 100% cut and dried in this tube game, is it?!

 

Absolutely correct in this case. These tubes are rebranded Siemens C3G/s labelled as Lorenz. I have stripped a set of standard Siemens C3G and they have a fully rounded glass envelope - no flat spot on top.

post #2510 of 2511
Quote:
Originally Posted by Oskari View Post
 

I would certainly agree. But. That SB date. Feb 61. It disagrees. This must be a late 1960 Mitcham tube with a week digit!

 

Oh, I missed the SB date! So yes indeed, if both of those tubes have the SB date, then they were manufactured in November 1960!  

post #2511 of 2511
Quote:
Originally Posted by TonyNewman View Post
 

Absolutely correct in this case. These tubes are rebranded Siemens C3G/s labelled as Lorenz. I have stripped a set of standard Siemens C3G and they have a fully rounded glass envelope - no flat spot on top.

 

On the other hand, everything I have read indicates that when these tubes were tested at the factory, those with a transconductance equal to or higher than 105% of the minimum specification (14000 µmhos) were marked with the suffix /s. And if so, surely there must be C3g out there, no suffix /s, with flattened tops. A more likely explanation, I believe, is that the shape of the top is likely due to a different year of manufacture. But of course, we need more data to be sure.....

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