@lewm- it is an H3000 which I got from a guy in Texas named Porter, when he distributed the line in the States. I only roll the rectifier and my fav for my system voicing is a GEC u-52, another not so easy to find tube these days. (I did get a NIB metal base Philips-Miniwatt from Andy at VTS, it has marvelous bass-but is less airy in my system-in a different system it might be better- it’s now a grail tube). No, no feedback issues at all. (NB- the depth of field in the photo makes it look like that horn is aimed at the TT, but the horns are toed in just past the "plane" of the table and they are pretty directional).
Audio clubs, formal or informal, are great. I was involved in one in NY back in the ’80s-- got to meet a lot of people who in turn shared their systems, swapped records and had fun. That’s one of the reasons--apart from finally meeting Albert in person after many years--that my recent visit to Albert’s was such fun. He has a regular listening group every week. We listened to a lot of different things (his Studer is gorgeous as was his selection of tapes), had some laughs and enjoyed each other’s company. It’s a great way to express and stimulate your interests in music, gear and all the "stuff" we seem to do in this pursuit. DC metro seems to have a fair number of audiophiles.
There are a few people I’m aware of here in Austin that have serious systems, but very little brick and mortar, which used to be another way to meet and hang-- the after hours demos, the friends you make in the hobby, etc.
Obviously, if you ever get to Austin, you are welcome to visit.