Wasn't sure where to post this since the EC studio thread is dead and I don't want to post it on the DN or AF threads. Acme 2a3 from psvane. I got a pair of these NIB, cheap from a guy who didn't end up using them. They have a unique balloon shape which is the first I've seen of the 2a3. Plate and filament design is very similar to Electroharmoix 2a3. I don't like the eH very much, they are kinda glarey and hard sounding. My EC studio runs quads or two pairs of 2a3, in the two pair configuration you sort of get an amalgamation of both tube signatures. So this is not a great comparison as I am not able to properly compare with only the single pair. However, after spending a lot of hours with the studio and just about every 2a3 on the market, I believe I can pick the signatures from a single pair as I know fairly well the signatures of my other 2a3 pairs. I started by trying the eh with the acme, mainly because I was worried the acme might blow up my amp or other tubes. @Mongstradamous who made this joke and now I can't stop thinking about road runners.. Fortunately they didn't explode or kill my amp. Straight out of the box the first 20 hours was a bit hard, and lean. Super airy but bass was a bit loosy goosy. I rolled in some NOS RCA black plates instead of the eH and that seemed to make things sound more linear, bass extends well, remains tight and well controlled, at 50 hours resolution is ALMOST as good as my favorite fivre copper rods and might be at a similar level by the 100 hour mark. Have been happily listening and would say that these are really fantastic sounding tubes in this set up. Running the LM erricson drivers, tele recs and hd800sdr with convert 2. These psvane a2a3 sound fairly normal considering their design and shape. They are definitely on the same playing field as good quality NOS and are better than sophia, eh, new Kron, EML mesh in my opinion. WRT single plate, copper rods, dual single plate, avvt and old KR, these are likely to perform slightly better with good synergy but due to their volatility, rarity and price tag, I would say the acme is a great buy with a warranty and 95% of the performance of these examples.