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Old 27th September 2008, 10:24 PM   #1
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Default Looking for a linear triode for lowish B+ CF (6N6P?)

People, I have an push-pull ECC88 cathode follower in a piece of equipment with a B+ of 130v (not of my own design) and 11k cathode resistor - 1k+10k with the self-bias point between, working into 2:1 output transformer.

I like its sound but I'd like to try out something which would be a little more linear at the given B+. I won't be chaning the circuit topology, pin order or B+.. Just want to try out a few tubes with their optimal points to find if I could get it accept a little more voltage swing at the inputs.

So far the best thing I've found is the 6N30P, which seems like a real winner at 130v, biased perhaps by a 200R+4k7 resistor for -4v at the grid, if I remember it right.

6N30P's seem bloody expensive, so another cool one would be 6N6P. Not as linear, but seems a little more linear to me and the push-pull configuration would cancel out the distortion.

But just to open up the eyes, I'm asking you gurus - what other tubes I should try?
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Old 28th September 2008, 04:11 AM   #2
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IMHO, you're spending your effort on the wrong this. An ECC88 makes a very good cathode follower, and 130V is a pretty decent voltage to work with for that tube. If you spent your effort on replacing the cathode resistors with a CCS, you'd be way ahead of where you are going with just trying other tubes.
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Old 28th September 2008, 04:12 AM   #3
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2xIRF610?
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Old 28th September 2008, 09:41 AM   #4
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Well, I gave some thought to this, too. Might be I just need to try out a CCS. Back to the Gary Pimms site..
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Old 28th September 2008, 11:42 AM   #5
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A few choices - 5687, ECC99 as well.

But look at 6S4A and 12B4A - really good sound and you can buy them by the dozen for peanuts. You can then match them, which you need to do since they measure all over the place (especially the 12b4). A stock of these then sets you up for drivers, preamps etc etc. The 6S4A is a particularly useful little tube with its higher gain.

andy
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Old 28th September 2008, 12:36 PM   #6
Gordy is offline Gordy  United Kingdom
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The 6H30 (6N30) really is very linear... and surely not so expensive...
http://www.watfordvalves.com/products.asp?search=6h30
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Old 28th September 2008, 05:18 PM   #7
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Default Yes there is such a tube.

It's not made any more. But don't tell anyone, or there will be a run on the tube. The rabid Koreans and Japanese will buy up all the existing stock and reasonable folk will have to pay through the nose. Ray
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