Akhilesh, trash in the DC does not manifest itself as hum, only excessive ripple from the residual AC component. Trash manifests as a lack of focus or coherency,a graining or veiling, or other anomalies. Indeed, IMO, tube rectifiers or FREDs with a choke input (L-C) is the ultimate. Even if you have no choke, adding film/foil parallel caps to the aluminum electrolytics can make a difference. Fast Caps, Cerafines, or Black Gates, anything to ditch the aluminum electrolytics, will yield a blacker background, smoother presentation, and often better microdetail.

Wayne, you probably have very little residual ripple. A bit of hum is just gonna happen with DHTs. I know, I'm a fellow 2A3 fanatic too!

Thermionic