6SN7 tube, some types

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2C22
 For "Hardcore" users. A "better" 6SN7, but it has a plate cap and a grid cap, and only one system per bulb. So not what you call a direct replacement.
6SN7
 Generic tube
6SN7GT
 GT means glass tube, though never a steel version was made.
6SN7GTA
 Upgrade of 6SN7GT, max 450Volt Ua, 5Watt per system, 7.5Watt total.
6SN7GTB
 May also be used for series heating. Also faster heat-up.  (11 seconds).
6SN7W
6SN7WGTA 6SN7WGTB
 "W" =  military version. Long life version, with 10.000 hours life. Sometimes 5692 was rebranded as such, which is like downgrading 5692, but I think it was done to enable military purchasing, if the parts list says for instance 6SN7WGTA or SN7WGTB, you may as well use 5692, but the purchaser is not allowed to do so. This is where rebranding can help.
6BX7
 Secret tip!  Data like 6SN7, but 10 watt per triode.
6BL7
 Secret tip!  Data like 2x 6SN7 in parallel, but 10 watt per triode.
6C5
 Close to 1/2 section of 6SN7.
6CG7
 6SN7 in Noval socket.  Check at Electro Harmonix in the menu of this website. 
6DN7
 One system (N) of 6SN7, other system (D) is comparable, but has 10 Watt.  Great HiFi tube.  Undiscovered tube
6H8C
 Russian Version. Can do higher plate voltage. 
6J5
 1/2 Section of 6SN7, octal based tube.
L60
 Mullard Version of 6J5
7N7


7N7 is a loctal socket version of 6SN7 with shielded metal tube base. (look below here, for pictures). WE OFFER A SPECIAL ADAPTER FOR 7N7.

12SN7
 12 Volt version of 6SN7
12SX7
 Military long-Life version, with spiral filaments. Hard to get, and sometimes expensive.
13E1
 25Volt version of 6SN7.
33S30A
 Swedish military versions of the 6SN7.  Very rare. 
33S30B
 Swedish military versions of the 6SN7.  Very rare.
1633
 25V/0.15A heater version of the 6SN7.
5692
 Military Part number, for shock-proof tube. Introduced 1948. The famous "red base".  Weight is much higher, and has different construction inside.  In the top-five list of most wanted 6SN7 tubes. Mind, this tube differs somewhat from "real" 6SN7. The 5692 has TWICE the filament current, which is a LOT more, and it has another bias point. By itself the bias is not problem, but the tube comes out "bad" on some specific testers while they are fine in fact. Ask for 5692, tested on a tested with 5692 settings! Otherwise you may have a problem.
6042
 25V/0.15A heater version of the 6SN7.
6180
 military version of 6SN7, with 10.000 hours life
B65
 12SN7 by Osram. 
B65
 6SN7 by Osram.  In the top-five list of most wanted 6SN7 tubes.
CV181
 military version of ECC32
CV925
 military version of 12SN7
CV1986
 military version of 6SN7GT. Great sounding and rare tubes like VT231
CV1988
 military version of 6SN7GT. Great sounding and rare tubes like VT231
CV2627
 military version of 6SN7W
CV2821
 military version of ECC33
ECCXX
 No an equivalent, but some of those are close though grid voltage,  gain,  transconductance are all a bit different. 
JAN 6SN7
 JAN=  our secret tip!  JAN stands for Joint Army Navy. To be JAN specified, the tube factory must do stress test (above normal specs) on samples of standard tubes. The sample is a few percent from the whole lot, and must be taken from a table that is in the JAN handbook. From the samples tested,  a certain percentage must survive.  When yes, the whole lot is now  life-time-expectation approved, and may now be marked with the quality prefix JAN.  The samples that are  actually used for the stress tests must be destroyed.  JAN Specs are still in use for electronics today! JAN stands for Highest  reliability. You can be happy that the average amateur has no idea at all what JAN means, and will not understand it even when explained. So they just associate it with "something military", which is not connected with good sound. So these tubes are not more expensive (great!). If  you expect highest lifetime out of your tubes,  our advice is:   JAN = the Nr1 HiFi choice! 
VT231

One of the BEST 6SN7 you can buy. Military Part number, for  6SN7.  P/N used until 1945, and a guarantee for real old tubes. The older Sylvania VT231 with long glass and parallel plated are beautiful, top quality, and unfortunately hard to get and expensive. In the top-five list of most wanted 6SN7 tubes. Also very exclusive are the RCA VT231 smoked glass, with Chrome getter. Also found under NU and KR brand name.