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About the only thing you have to watch out for is the filament current and you would have to specify whether EL34's or EL37's will be used due to slightly different socket wiring. 6L6's use .9 amps and 350B's are a little more. We have a high current power supply for tubes that require over .9 amps each. (D.C. filament upgrade heavy duty option) The EL37 draws 1.4 amps, not much different than a EL34. Tube rolling is fun! So you know- All my amps use 5881's/6L6's unless otherwise stated. I chose this tube because it is pretty much the ideal tube for audio use. A good 6L6 is VERY clean sounding, noise free, efficient, fast and cost effective. Doesn't get much better than that! One more perk: The most wattage for the money of any tube made.
The Valve Art 350B is not a direct copy of the WE350B. It is in fact a 5881..a 25 watter, so it can be used in the NS40. This is the info given by the supplier
Hi Blair:Thanks for the helpful info (and tip on Sino 6SN7s) - and no worry, I'm way too cheap to get sucked into the vortex of esoteric audiophilia! I did, though, get some NOS Russian 6-SP3-Es (or whatever their name is) - and they sound fantastic!
If you really want to experiment with tube rolling get some tube socket adapters. A socket adapter alters the pin out so you can use electrically exact or similar tubes.http://www.ebay.com/itm/Two-adapters-7N7-6SN7-tubes-amplifier-SUB-/260903937441?pt=Vintage_Electronics_R2&hash=item3cbf1625a1http://www.ebay.com/itm/6F8G-6SN7-Tube-Adapter-pair-/220901309236?pt=Vintage_Electronics_R2&hash=item336ebe7b34http://www.ebay.com/itm/6CG7-6FQ7-Tube-6SN7-Tube-Adaptor-pair-/220889318085?pt=Vintage_Electronics_R2&hash=item336e0782c5For example, for input/ gain tubes I use the 7AF7/7N7 plus adapter to replace the 6SN7 as these tubes are exact electrical equivalents. Same with the 6F8G (6SN7 with plate cap). I also like to use the 6CG7 with adapter again to replace the 6SN7. The 6CG7 is often referred to as a 6SN7 in a 9 pin bottle. You can pick these adapters up on ebay and once you have the adapter every tube you buy saves you money.Why??? NOS sound quality for much less money. The Sylvania tall bottle 7N7 = Sylvania VT-231/6SN7 for $8-10. 6CG7's can be had for $11-15 and you can use another tube wit the 6CG7 adapter called the 6GU7 ( the 6GU7 is essentially a 6.3 volt 12BH7 and one of my favorite tubes) and they cost all of $5 each.