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6SN7 tube question

Hello,

I need to replace the tubes in my Rogue 99 line preamp, which uses the 6SN7 tube. I was looking at an online seller who offers the following options with an affordably priced 6SN7 for a few dollars extra:

1. Balanced Triodes
2. High Gain
3. Low Noise and Microphonics
4. Matching

Options 3 and 4 seem most desirable for a preamp. My question is whether it is worth the extra few dollars (approx. $6 per tube) or is it just a pure marketing ploy to get suckers like me to drop more dough?
actusreus

Showing 2 responses by john_tracy

john_tracy
344 posts
 
I'm a bit frustrated as I've had to replace the tubes just about once a year even though I listen on the weekends only,

Check the filament voltage. If it's much more than 6.3vac then you will need modify your unit to lower the voltage. I have a Sun SV2A3 that was eating 6SN7s and the filament voltage was ~7vac.

john_tracy
344 posts
 
The filaments of a 6SN7 are on pins 7 & 8. If the supply is DC it is probably regulated and spot on unless there is a problem. AC supplies generally depend on the incoming line voltage. If it is consistently high then the filament voltage could be too.

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