thecrow
Headphoneus Supremus
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Hello does anybody here have a pair of GEC 6AS7G (brown base) tubes I can buy off you? I understand these are highly coveted and rare tubes, but thought it's worth a try. I have extra money so please PM me if so. Otherwise please let me know where I can buy a good pair.
Also would anybody please tell me if they have compared both the GEC 6AS7G to the GEC 6080's? (brown base ST tubes vs. the straight form tubes?) I'm very interested to know what the sonic differences are between the two. Perhaps @gibosi would know...
Additionally I would be interested to know which are considered the best 5998 tubes? I saw a conversation about these earlier on this thread, but didn't notice which brand was the regarded as best.
This is for my Elise tube amp which accepts both 6AS7, 5998 and 6080 as power tubes, and 6SN7 class as drivers
Oh yes also I'm interested to find a pair of tubes in the 6SN7 or small 6DJ8 class that are dark meaning with less treble and more bass, if anyone can recommend which ones? Thanks so much!
Wondering
Are gec6as7g the same as a1834 and the same as cv2523?
Is there much veriation between years ot can a matching pair be easily plucked from two various years?
Is the z crucial on tbe bottom right of the box? What does the z, the 4 or x/z mean?
Thanks in advance for any help
And i believe the first of two letters gives the year bus is that just for the 50's and 60's?Yes, these are all the same tube:
http://www.radiomuseum.org/tubes/tube_a1834.html
In general, it is best to have tubes that were manufactured at about the same time. That said, I have three pairs, 1949, 1956 and 1961, and my old ears can't reliably tell the difference between them.
In the case of British tubes, the letter "Z" is a "manufacturer's factory identification code" which tells us which company manufactured the tube and in which factory:
Z = MO Valve Company, Hammersmith
"X" = When approval has been given for the use of a valve in MDAP equipment by the Director of Electronics Research and Development (Air) but that valve has not received qualification approval the letter X is used.
As to the number "4", I have yet to discover what it means, but this number is commonly found on GEC/MO Valve tubes.
On the other hand, not all GEC 6AS7G have these CV codes. And in some cases, all the silk-screened text may be gone. But even so, the construction of a GEC 6AS7G is different than any other 6AS7G, so they are easy to recognize.
http://www.tubecollector.org/cv-valves.htm
And i believe the first of two letters gives the year bus is that just for the 50's and 60's?
When do you think production may have stopped?
Ps i'll read your second link - it looks great
I have one tube with codes on it of 6935 so i guess thats 1969As per the second link, a two-letter date code was used until the mid-to-late 1960s (ZM = 1968, December), and after that, a 4-digit numerical code, similar to that used in the US, was used.
So, for example, my three pair:
1949 = EM
1956 = MC
1961 = SB
According to Wikipedia, GEC/M-OV ceased the manufacture of vacuum tubes at the Hammersmith location in 1988. However, I have no idea if they continued to produce the 6AS7 into the 1980s. Perhaps others who have this tube would be willing to take at look at the date codes and let us know if theirs were manufactured in the 1970s or even later.
I have one tube with codes on it of 6935 so i guess thats 1969
Im being offered a tube with no codes on it so im guessing they've been rubbed off.
I also have bought two in the past with nothing on it. They sound legit. Im guessing they started with codes on them?????
A couple weeks ago i found this single GEC 6080WA /CV8614 .I am looking out for another one to make a pair is it important to get the same 6080WA/CV8614 markings or another 6080WA lets say for example GEC6080WA/CV2984 would be ok