[gibosi]

  According to the price list from JACMusic, there are C3g tubes with the names of Lorenz, Telefunken and Valvo as well, in addition to Siemens. Don't know if these were rebranded,
 
There is also another type not mentioned before, the C3o. This is a C3m (20V tube)  manufactured for 6.3V usage.
 

 
I am reasonably sure that Lorenz, Valvo and Telefunken C3g were all manufactured by Siemens. I very much doubt that there was enough demand for this tube to justify the costs necessary for each of these manufacturers to produce their own version, but of course, I cannot be positive.... 
 
While I was watching for a good price on a pair of C3g/s, I thought about getting a pair of C3o. However, the pin-out on these is different than the C3g. So while I could purchase adapters for the C3g (at that time), I would have had to cobble together a pair of suitable adapters, and very frankly, I really don't need anymore projects. lol.

 

[mab1376]

   
Hi Hypnos1,
 
They are coming along very well. Looking forward to see how they burn in the next 50 hours. Doubt, I can restrain myself for long from looking into alternative power tubes.  
 
Another upgrade I am seriously considering is: http://www.powerinspired.com/ag500-ac-regenerator-500w-p-1723.html I had the opportunity to use it for a few hours and the difference was quite impressive on my setup.

 
I'm currently using 6SU7GTY (6SL7) as power tubes and they pair very well with my very sensitive Beyer T70. They also sound very nice with my HD650's.
 
i haven't done very through A/B testing but i'm liking it subjectively. I would recommend someone else try the 6SL7 type with their phones report back.
 
I wouldn't bother with orthos or other power hungry cans due to the lower spec of the 6SL7 vs 6SN7.

 

[hypnos1]

  Hi Hypnos1 and Gibosi,
 
How great differences in SQ have you found between different C3GS tubes?

 
Hi A11.
 
Gibosi may well be right re the different brands (ie all Siemens), and yet JAC Music imply others are not...and charge accordingly! I personally smell a rat, lol!!
 
From what I can recall, I believe I did notice a slight improvement in the 'S' version over the standard one...apparently they were selected for higher transconductance readings. I did notice also a very slight difference in the top of the glass - the 'S' being slightly flatter. But perhaps this is down purely to different batches/years...who knows?!

 

[Acapella11]

Originally Posted by gibosi /img/forum/go_quote.gif
To the best of my knowledge, all C3g tubes were manufactured by Siemens, so there is nothing to be gained by rolling through the different "brands".
Good news for your wallet!

 
Good news indeed!

 

Hi A11.
Gibosi may well be right re the different brands (ie all Siemens), and yet JAC Music imply others are not...and charge accordingly! I personally smell a rat, lol!!
From what I can recall, I believe I did notice a slight improvement in the 'S' version over the standard one...apparently they were selected for higher transconductance readings. I did notice also a very slight difference in the top of the glass - the 'S' being slightly flatter. But perhaps this is down purely to different batches/years...who knows?!

 
Hi Hypnos1, my Siemens tube packaging says C3GS but the top of the black casing says C3G, so I am not sure what they really are.
 

Time to relax and enjoy a little tube glow.                                                                                                                                                                                                                                                                     

I understand ´the Sophia Princess 247B are very nice 6SN7 tubes. How much have you paid for those? You must be looking forward to the 6SN7 adapters now.
 
 
Just to be sure, these are the 6SN7 power tube adapters? http://www.ebay.com/itm/1x-5687-to-6N6-6N1-6N2-6N6-6N11-ECC88-E88CC-Vacuum-tube-adapter-socket-converter-/321472393335

 

[TrollDragon]

The 274b is a rectifier, not a 6SN7...

http://www.sophiaelectric.com/pages/se/274b.htm

 

[Acapella11]

The 274b is a rectifier, not a 6SN7...

http://www.sophiaelectric.com/pages/se/274b.htm

Oops

 

[Oskari]

 
Just to be sure, these are the 6SN7 power tube adapters? http://www.ebay.com/itm/1x-5687-to-6N6-6N1-6N2-6N6-6N11-ECC88-E88CC-Vacuum-tube-adapter-socket-converter-/321472393335

 
Oops? 

 

[hypnos1]

   
Good news indeed!

 
 
Hi Hypnos1, my Siemens tube packaging says C3GS but the top of the black casing says C3G, so I am not sure what they really are.
 
I understand ´the Sophia Princess 247B are very nice 6SN7 tubes. How much have you paid for those? You must be looking forward to the 6SN7 adapters now.
 
 
Just to be sure, these are the 6SN7 power tube adapters? http://www.ebay.com/itm/1x-5687-to-6N6-6N1-6N2-6N6-6N11-ECC88-E88CC-Vacuum-tube-adapter-socket-converter-/321472393335

 
Ciao A11.
 
Fear not, they ARE 'S's...strangely enough it's only noted on the box and NOT on the casing, or tube...weird!

 

[gibosi]

   
Good news indeed!

 
 
Hi Hypnos1, my Siemens tube packaging says C3GS but the top of the black casing says C3G, so I am not sure what they really are.
 
Just to be sure, these are the 6SN7 power tube adapters? http://www.ebay.com/itm/1x-5687-to-6N6-6N1-6N2-6N6-6N11-ECC88-E88CC-Vacuum-tube-adapter-socket-converter-/321472393335

 
Mine have the same packaging - C3g-S, but the black casing says C3g. Evidently this is normal. I have read that the C3g-s also have "Post" printed on the side, and the standard C3g do not. This is true of the two pairs I have one C3g-s and the other C3g, but I do not know if it is true for all.
 
And the link you posted is to allow a 5687 to be plugged into your power sockets. If you want to use 6SN7's, you will need an adapter similar to this one:
 
http://www.ebay.com/itm/1pc-6SN7-6H8C-6N8P-CV1988-B65-VT231-TO-ECC88-6922-6DJ8-6N6-6N11-tube-adapter-/201083508552?

 

[vic2vic]

   
Mine have the same packaging - C3g-S, but the black casing says C3g. Evidently this is normal. I have read that the C3g-s also have "Post" printed on the side, and the standard C3g do not. This is true of the two pairs I have one C3g-s and the other C3g, but I do not know if it is true for all.

 
Some C3Gs with C3G on the black casing have a very small S drawn by hand at the bottom side of the case, on the non black painted area. Probably they were measured as "exceptional" after the encasing, so marked as "s" at a later stage of production.
 
Regarding the "Post" print to differentiate between the 2 models, here are some examples of C3G (o S) with Post printing:
http://f.hatena.ne.jp/platycerus/20100618104035
http://www.ab.auone-net.jp/~pal/c3g.JPG
 
So probably all C3Gs have Post on the side, but having Post on a C3G is not enough to confirm it's a C3Gs

 

[gibosi]

   
Some C3Gs with C3G on the black casing have a very small S drawn by hand at the bottom side of the case, on the non black painted area. Probably they were measured as "exceptional" after the encasing, so marked as "s" at a later stage of production.
 
Regarding the "Post" print to differentiate between the 2 models, here are some examples of C3G (o S) with Post printing:
http://f.hatena.ne.jp/platycerus/20100618104035
http://www.ab.auone-net.jp/~pal/c3g.JPG
 
So probably all C3Gs have Post on the side, but having Post on a C3G is not enough to confirm it's a C3Gs

 
Yes! I found the little hand-written "s" on my C3g-s.
 
However, I have a pair of regular C3g which do not have "Post" written on the sides of the can. They have only the number "383" written on the side. But from your pictures, I would agree, "Post" is not a reliable way to tell them apart. Thanks for the info.

 

[MIKELAP]

   
Good news indeed!

 
 
Hi Hypnos1, my Siemens tube packaging says C3GS but the top of the black casing says C3G, so I am not sure what they really are.
 
I understand ´the Sophia Princess 247B are very nice 6SN7 tubes. How much have you paid for those? You must be looking forward to the 6SN7 adapters now.
 
 
Just to be sure, these are the 6SN7 power tube adapters? http://www.ebay.com/itm/1x-5687-to-6N6-6N1-6N2-6N6-6N11-ECC88-E88CC-Vacuum-tube-adapter-socket-converter-/321472393335

The 274b goes on my wa6 amp along with a pair of adapter i got from Woo to use 6SN7 I am also  waiting for 6SN7 adapters for the LD to use 6SN7 as power tubes not shure they will work i had bought them for another amp  if anybody knows let me know they are 6SN7 TO 6CG7. Thanks

 

[mordy]

Hi Mikelap,
 
Those adapters are the correct ones and will work just fine for the 6SN7 tubes - have them myself. Just plug the tubes into the adapter and then the whole thing into the LD amp. If you have the decorative rings the adapter is too wide to fit inside the ring, and you need two 9pin extenders.The 9pin extenders are narrow enough to fit inside the rings.
 
Tube + adapter + 9pin extender. In order to make it easier to find the pin holes in the socket I applied a little piece of colored tape on the 9pin extender to indicate the orientation.

 

[MIKELAP]

  Hi Mikelap,
 
Those adapters are the correct ones and will work just fine for the 6SN7 tubes - have them myself. Just plug the tubes into the adapter and then the whole thing into the LD amp. If you have the decorative rings the adapter is too wide to fit inside the ring, and you need two 9pin extenders.The 9pin extenders are narrow enough to fit inside the rings.
 
Tube + adapter + 9pin extender. In order to make it easier to find the pin holes in the socket I applied a little piece of colored tape on the 9pin extender to indicate the orientation.

Would it really matter if the adapters go let say only halfway in what do you think ?                                                                                                                                                                                                                                                                                                

 

[MIKELAP]

Would you be suspicious of these tubes the glass inside looks cloudy around the edges they seem to be chrome tops.is that normal suppose to be badboys . What to you guys think would you buy these tubes.?