Just wanted to let you guys know. They are all not the real Chrome Dome. The pair OP bought is just Sylvania 6SN7GTB, very common. The real Chrome Dome basically has the flash getter cover the whole glass envelope, you cant really see the interior. Link: https://www.head-fi.org/threads/the-6sn7-identification-guide.209782/ Adhoc has the description here and I have seen it myself. BTW, I have the followings for reference:
SYL VT-231/6SN7 GT
SYL 6SN7 GTA
SYL 6SN7 GTB
SYL 6SN7 W
SYL 6SN7 WGT
A note on Sylvania Chrome Domes:
The “Chrome Dome” moniker was first applied to particular early 1950s vintage Sylvania 6SN7GTs by tube enthusiasts. The name came about in response to the tube’s appearance – it had a beautifully shiny top getter flashing that nearly reached the bottom of the tube, obscuring almost all of the internal construction from view.
These particular 6SN7GTs are extremely rare, and as time passed, people began applying the “Chrome Dome” moniker to many other Sylvania tubes with top getter flashing.
The following Sylvania tubes are often (incorrectly) called ‘Chrome Domes’:
6SN7GTA
6SN7W
6SN7A
6SN7WGT
6SN7WGTA
Lastly, here is a good example of a real Chrome Dome but a pair of 6SL7GT (note: it is GT, not GTA or GTB)
https://www.ebay.com/itm/2653268335...brand=SYLVANIA&_trksid=p2334524.c100667.m2042
SYL VT-231/6SN7 GT
SYL 6SN7 GTA
SYL 6SN7 GTB
SYL 6SN7 W
SYL 6SN7 WGT
A note on Sylvania Chrome Domes:
The “Chrome Dome” moniker was first applied to particular early 1950s vintage Sylvania 6SN7GTs by tube enthusiasts. The name came about in response to the tube’s appearance – it had a beautifully shiny top getter flashing that nearly reached the bottom of the tube, obscuring almost all of the internal construction from view.
These particular 6SN7GTs are extremely rare, and as time passed, people began applying the “Chrome Dome” moniker to many other Sylvania tubes with top getter flashing.
The following Sylvania tubes are often (incorrectly) called ‘Chrome Domes’:
6SN7GTA
6SN7W
6SN7A
6SN7WGT
6SN7WGTA
Lastly, here is a good example of a real Chrome Dome but a pair of 6SL7GT (note: it is GT, not GTA or GTB)
https://www.ebay.com/itm/2653268335...brand=SYLVANIA&_trksid=p2334524.c100667.m2042
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