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This post is a derivation from the following post:

http://www.romythecat.com/Forums/ShowPost.aspx?postID=11797#11797

What is interesting is that I have a few the same types of shields for small 7 pin gas tubes and I have tried those shields on the gas regulators on my Melquiades. The shields on the gas tube do not damage sound at all. It is a common practice in past to use in measurement equipment the gas voltage regulators with external shields (in addition to an internal shield that any gas regulator has). Now I tried it on my gas tubes that serve Milq’s bias.

The positive supply gas tube had no difference between “with shields” and “without shields”. On the negative supply tube that cares grid bias the shield effect was auditable. The effect was very different then what it was on 6E5P and the effect was to much less degree. I would not even say that I bas better or worse – it was a tiny bit different but to a degree that I would argue if it was ever important.

Adding the external shields to 0A2 (the Amperex tube with doted internal shield - the best 0A2ever made) made sound a bit firm and a bit stiffer. Not a lot, juts a very little. I do not think that it has practical meaning however….

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