2. amps-preamps
  3. 1050859150

How do 6SN7WGT vs 6SN7GT differ?

I have Cary WE300B SE monoblocks and a Cary SLP98P preamp. I have been purchasing back-up tubes to stash away for the future. I am confused by the broad number of GSN7 tube types available, in particular the difference between N.O.S. 6SN7WGT and 6SN7GT(A/B)tubes. Are they simply interchangeable?

I use high dB horn speakers (103dB sensitive), so I am concerned about tube noise. I have teflon tube dampers on all tubes, and these, I believe, help with microphonics.

Thank you.
cardiackid
twl
3,251 posts
 
The "W" is a mil-spec designation. The "GT" is the oldest, followed by the "GTA" and "GTB". The earlier are usually the better. However GT and GTA and WGT are all great. The GTB is very good if made during the first half of the production life of the GTB, and they went somewhat downhill toward the end. Still a good tube though. Any GTB, even the worst ones, are alot better than any of the newer stuff, IMO. I'd try to go for the older stuff whenever possible.
cardiackid OP
63 posts
 
TWl:

Thank you very much. I appreciate you thoughts.

Greg
sugarbrie
3,854 posts
 
Yes the W denotes military..

From a purely technical standpoint the tubes ending in GTA, GTB can handle higher voltages (max of 450 volts or 5 watts per section) than a GT can (max 300 volts or 3.5 watts per section). Therefore the GTA/GTB will run cooler.

The GTA/GTB were made for televisions commerically, and for military probably a television type display and other higher voltage applications.

If you want a quiet tube then try a 5692 tube. A 5692 tube is rated for up to 275 volts or 1.75 watts per section.
cardiackid OP
63 posts
 
Thank you. Sugarbrie. Greg
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