6SN7 grid stopper ?

pre65 · Post by **pre65** » Tue Jun 02, 2009 8:30 pm

Does the 6SN7 need grid stopper resistors ?

Not used this particular valve before so not sure.

andrew Ivimey · Post by **andrew Ivimey** » Tue Jun 02, 2009 9:32 pm

Well I have probably seen it, but no, not really.

Grid stoppers are just there to stop rf and other high frequency oscillation getting started and messing up the valve doing its job properly, and 6SN7s, being wonderful valves designed for supreme audio just don't do that sort of thing.

Used properly, many would say, they are the best audio valve ever.... but then !!!

But if you were to put a resistor as hard against the grid, as is humanely possible, 100ohmmmmmmmmmmmms to 1K, it ain't gonna do no harm, now, is it.

bonneville · Post by **bonneville** » Thu Jun 04, 2009 1:07 pm

Hi Phil
My recently acquired Arion Talos amp uses 6SN7's and does have resistors butt up against the valve .hope this helps

Vinnie

Mike H · Post by **Mike H** » Thu Jun 04, 2009 11:32 pm

pre65 wrote:Does the 6SN7 need grid stopper resistors ?

Have never had to bother IIRC and I've used 'em in various things going way back. Them's usually well behaved them 6SN7's.

7N7 · Post by **7N7** » Tue Jun 30, 2009 5:23 pm

I once built a line stage using 6SN7s driving cathode followers. This turned out to be oscillating at about 2.6MHz; I replaced my normal 470R stoppers with (I think) 2.2k - this did the trick.

Paul

Mike H · Post by **Mike H** » Wed Jul 01, 2009 1:19 pm

What were the cathode followers?

7N7 · Post by **7N7** » Wed Jul 01, 2009 6:03 pm

Mike H wrote:What were the cathode followers?

Cannot remember exactly: possibly something cheap like 6/30 L2, 6BQ7 or 6BZ7 or some other dual triode; I remember I was using EF95s as active loads for the cathode followers so it must have been DC-coupled.

P.

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