On the assumption you've got all the info. you need, enjoy your wireless!
I know for a fact that the weak point in these tuners is the stereo decoder (in the stereo models- monos would need an external stereo decoder fitting...).
Hi-Fi World magazine first alerted me to these tuners in, oh, about 1993 and since then have periodically run articles on modern decoders, which can be fitted to the mono T/L2 and mono T/L3 models, externally, or internally on the T/L stereo models.
I remember Tim De Paravicini among others doing a decoder, but it was probably 10 years ago now.
If you did want a modern decoder, you could do a lot worse than speak to Nick at The Emporium: I believe he can fit/supply these.
He also offers a part-ex., your old, unmodded for modified stock.
Anyone interested in a Troughline should also factor in the cost of a decent aerial: your apocryphal "omni in the loft" or "bit of wet string" will NOT work! You must be thinking Ron Smith Galaxy or suchlike, in truth.
I've had my Troughline for about 10 years (in daily use) and it gets switched on/off every day. I haven't had to touch any of the valves so far. Mine is unmodified, although the temptation is definitely there!
BTW, this is the best tuner I've heard (and I work in a hi-fi retail outlet!)