I can see why you might think Cascade & Amarillo are very similar based on smelling the pellets. To me, pellets of both varieties have a citric/geranium like aroma which is quite similar.
However once you've made the beer, I find that Amarillo gives a much richer combination of fruits in the mouth than Cascade. Cascade tends toward a more pure citrus aroma and a "thinner" more grapefruit like character which lets bitterness shine through, whereas Amarillo has a rich tropical fruit punch sort of flavour with hints of stone fruits. I also think an Amarillo hopped beer can stand to have more bitterness due to the richness of the flavours imparted by the Amarillo. (Good heavens, I'm starting to sound like a wine tosser.)
Regarding Traditional Ale Malt - I find it always produces quite a dark wort compared to English pale malts, and now enter it as 3 degrees Lovibond like a Belgian ale malt. This seems to give a more accurate estimate of wort colour.
I wonder when this Amarillo mania is going to subside. Everyone (including me) seems to be in love with the variety.
cheers,
Colin
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