Thanks for the valuable info. I think that I will try to make an arrangement so that the meters are fixed to the chassis instead. The stand offs are ca 10 mm if I read it right. There is also a single lamp, is that one fixed into any particular place or just placed between the meters without any particular arrangement?
I looked a bit for tubes for you H3A and it was not so uplifting. The brands out there are not familiar to me and the ones mentioned had shifting reviews. The Svetlana should be avoided as far as I understand. There was a Chech variety that had some favourable mentionings but priced ridiculously high and also short in supply. However I found this page that may merit some further investigation.
http://www.vacuumtubes.net/RES%20Audio% ... power.html
I looked at some pictures of the power amplifiers that you are also using. They really look very nice but my guess is that the Futtermans will beat any 300B configuration. Last week I listened to "the Lars" an impressive looking 300B design and favourably reviewed in Stereophile. At first they sounded very very good but after a while you got tired of the "hit a sofa with a salami" sound in the low register. The notes in the low register never stopped and therefore smeared the whole register. The mid and top registers were very seductive though.
Now I will make a try to post my first pictures which will be of my H3AA. If it does not work please look at my gallery