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작성자 DHTsound
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  6N6P - PP

 

6N6P - PP

Hi James,
> Thank you for the kind comments. It's simplicity evolved :-) The first version was much more complex - and sounded worse.

That is often the case :-)

> I've tried the volume control both ways round and found it sounds better like this. It's strange 'cos matching theory says it works better the other way round... not sure why but I've been trying it both ways round for four years and almost always prefer this way.

Thanks, that is something to keep in mind. I applaud you for going with your ears rather than blindly following theory. Sometimes the best theory doesn't give the best sound; I wish I knew why...... Well of course I could say that the theory is wrong, but then I do not have a better theory to posit.

> I'm not running grid stopper on the 6N6P - never needed them. I'm not using grid stoppers on the 6H30 in this circuit either as the input trannie is right up against the valve base and the low dcr seems to keep everything under control - I guess that and the relatively low volume pot. Of course different peoples builds and environments might make it necessary.

Ah yes, and perhaps that is why the volume pot sounds better where it is rather than between the tranny and grid. Maybe the next time you try this location for the pot you could test this theory by seeing if then a grid stopper makes a difference.

> Something I think will improve it is a minimum reactance psu (after Dave D!) But I haven't got round to building it yet and I would use a 6C45 as the shunt element with a TL431 (after JRB)... One per channel or if I get lazy it might end up being a 6C19 or 6C41 for both channels

You won't need a lot of current in the pass tube since the output is push-pull. Probably just the difference between the peak versus idle current in the input stage. I would guess that a 6H30 might be an over kill for the whole thing and you might even get by with a 6N1P or 6DJ8. Of course you would have to run the numbers to make sure.

> I have been trying out lots of different ideas to make a high quality low output monitoring amp for my boys recording studios (otherwise known as their bedrooms :-)) and I think this may finally be it.

Just when I think am done I think of something else to try... Like have you tried a tube rectifier?

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