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Old 3rd April 2004, 02:02 AM   #1
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Default 6n7gt

Anyone done anything with a 6n7gt?--I was looking to use it as a driver for a couple of pl/el509 valves, and want to be able to drive the grids positive (AB2?), in an OTL (Sweep Tube Monoblock)

Would this valve replace a 5687 for this sort of highish power job?

Any views on if this valve is any good as to sound or distortion? I cant find much about it save its specifications!

Thanks!
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Old 3rd April 2004, 02:30 AM   #2
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Default 6N7 but not gt

Hi,

The first amp I built uses a 6N7 as the volt amp/floating paraphase splitter. It is run in the low current Class A mode seen on the datasheet. It sounds great, no reservations at all.

I also have a late forties Stromberg-Carlson 6L6 amp that uses the 6N7 as the driver. Sounds very nice as well. Haven't tried the glass tube though.

Michael
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Old 3rd April 2004, 02:54 AM   #3
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Hi,

Quote:
It is run in the low current Class A mode seen on the datasheet. It sounds great, no reservations at all.
Did you run it with both sections in //?

Cheers,
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Old 3rd April 2004, 03:22 AM   #4
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I've used a 6N7GT (sections in parallel) to drive 10Y and 45 power stages. Very sweet sounding tube. I don't know about supplying power to a grid, though. You might want something with a lower Rp.
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Old 3rd April 2004, 04:35 AM   #5
SHiFTY is offline SHiFTY  New Zealand
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I think these are quite useful for a push pull circuit, they could be great in a long tailed pair.

Most LTP circuits call for the cathodes of the driver triodes being connected together with a resistor to ground, in a 6N7 the cathodes are internally connected so its ideal..

I have a NOS sylvania, i have struggled to use it anywhere tho.
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Old 3rd April 2004, 12:14 PM   #6
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Default 6n7gt

In the amp I plan, it will be in a cathode follower arrangement, driving the grids of the '509 o/p tubes, the sections of each (2) drivers tubes will be parralleled off anyway and will drive 4 x '509 each. 8 x '509 in total
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Old 3rd April 2004, 12:57 PM   #7
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Default phase splitter

Hi Frank,

No the sections aren't in parallel. I am using it as a phase splitter. Will post the schematic and a picture in a new thread.

Michael
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Old 3rd April 2004, 11:01 PM   #8
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I would think there would be tubes much more suited for cathode follower operation than a 6N7GT.

What about using a triode connected pentode designed for use as a video amplifier? Like 6AG7 or 6AC7 or 12GN7. All of them are cheap, available and have loads of Gm.
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