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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

Showing 3 responses by sugarbrie

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.
sugarbrie
3,854 posts
 
Oh.... the most popular 5692 tubes are the RCA Red Base and the CBS Hytron. If you find any other branded 5692 tube with the same color Red Base, then it is the RCA tube. RCA made some for a few other companies.

The 5692 will generally have the lowest possibility for microphonics.
sugarbrie
3,854 posts
 
Actually, it is the WGTA/GTA/GTB that has the highest voltage handling. The WGT is a military GT.
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