Abe Carmeli wrote: Ah, Jim, those heavenly singles, do they work across the board or just on particular type of coffees, say high growth acidic.
The comparison testing spurred me to improve my singles technique on the Tea as well, so I think I can offer some all round thoughts.
Singles as a whole are better for espresso tasting than doubles; they are mellower, allowing for more tasting and an easier discernment of flavors. This is partly due to taking smaller sips, but it's also due to basket edge effects. In a single, the conical or two step shape of the basket puts a lot of more coffee around the edge compared to a double basket with a simple cylinder shape. I'm guessing the edge of a single is relatively underextracted compared to a double, and that this produces the milder flavor.
The machine does amplify flavor differences like all espresso machines, but without distorting them as much as most machines; it's similar to the Peppina in this regard. I have a bunch of roasts in right now for cupping; among similar coffees, the small quality differences in the cup become very apparent when making shots; the machine rewards coffees with powerful aromas and tastes; and punishes those with weak ones. For coffees designed for espresso, it is also fairly merciless -- the godshot+ shots from my blend on Wednesday lost noticeably in oomph each subsequent day as the roast faded. I'd never noticed this as vividly on the Tea.
However, it's actually fairly kind on some coffees I thought would suffer. Jason's Verona blend has Monsooned Malabar and Kapi, two constituents I usually find overpowering when I'm pulling this style blend on the Tea. On the Elektra, the blend comes out understated and elegant, a real treat when one is steeling oneself for Dolce or Malabar Gold style assertiveness. However, a lot of this may have to do with the care Jason takes on his roasts.
As to "Fly-Bart," the OPVed Elektra is buzzing more loudly. Also, I need to check if most of the improvement on the doubles is from the needle valve alone. So, over the coming weeks, I'll tinker a bit with vibration damping, and using the needle valve on its own. If vibration damping works, I'll post that to a new thread, since there's quite a few vibe owners looking for fixes in this area. Otherwise the results will be in the long term follow up.