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Re: 6922/6DJ8 etc.,

Posted by Ralph (M) on May 23, 2006 at 09:13:19

In Reply to: Re: I agree with Jeff; I think... posted by Analogtheo on May 23, 2006 at 07:57:47:

including the much vaunted 6H30 'super tube' and its brethern, all have the same issues with microphonics and contribute to unnatural brightness.

So if you are concerned about getting some warmth out of the amp, it may be bona fide as the input tube is probably robbing you of some of that.

We used to use 6DJ8s and the like 16 years ago and discovered how profound this problem is. When the 6H30 showed up, we found it had similar traits. It will be a good idea to use a tube that was actually designed for audio.

I recommend perhaps a 12AT7, but there are no direct substitutes so you will have to figure out the bias point for the new tube that you go with. My point here is that until this is dealt with changing capacitors will not help- they may compensate the problem in some way but you will introduce other colorations as well. My suggestion is get to the root of the problem first- then deal with the caps.

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